1. 25 Jun, 2015 40 commits
    • Shahed Shaikh's avatar
      bnx2x: Fix VF MAC removal · bb9e9c1d
      Shahed Shaikh authored
      There's a bug in today's driver where VF requests to add/remove MAC filters
      always reach the Hypervisor as add requests.
      This prevents the VF from changing its MAC address, as it cannot remove the
      previously configured MAC and runs out of MAC credits.
      Signed-off-by: default avatarShahed Shaikh <Shahed.Shaikh@qlogic.com>
      Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
      Signed-off-by: default avatarAriel Elior <Ariel.Elior@qlogic.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bb9e9c1d
    • Manish Chopra's avatar
      bnx2x: Don't notify about scratchpad parities · ad6afbe9
      Manish Chopra authored
      The scratchpad is a shared block between all functions of a given device.
      Due to HW limitations, we can't properly close its parity notifications
      to all functions on legal flows.
      E.g., it's possible that while taking a register dump from one function
      a parity error would be triggered on other functions.
      
      Today driver doesn't consider this parity as a 'real' parity unless its
      being accompanied by additional indications [which would happen in a real
      parity scenario]; But it does print notifications for such events in the
      system logs.
      
      This eliminates such prints - in case of real parities driver would have
      additional indications; But if this is the only signal user will not even
      see a parity being logged in the system.
      Signed-off-by: default avatarManish Chopra <Manish.Chopra@qlogic.com>
      Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
      Signed-off-by: default avatarAriel Elior <Ariel.Elior@qlogic.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      ad6afbe9
    • Yuval Mintz's avatar
      bnx2x: Prevent false warning when accessing MACs · 9d18d270
      Yuval Mintz authored
      Each time a flow finishes reads from the classification shadow
      configuration in the driver, that flow would check for pending commands
      and pass them to FW if possible.
      In case there's already a completion pending command, I.e., a ramrod
      that has been sent to the FW and is yet to be completed while said flow
      tries to configure the pending command we would get a false error message
      in logs [and panic if SOE was used for driver compilation] since the
      command could not have been completed.
      
      This prevents said print [and panic]; The pending command will be sent by
      the time the completion of the current sent command would arrive.
      Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
      Signed-off-by: default avatarAriel Elior <Ariel.Elior@qlogic.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      9d18d270
    • Yuval Mintz's avatar
      bnx2x: Correct speed from baseT into KR. · 5d67c1c5
      Yuval Mintz authored
      ethtool shows KR supported/advertised speeds incorrectly as baseT
      in cases the board is in fact KR-base.
      Signed-off-by: default avatarYaniv Rosner <Yaniv.Rosner@qlogic.com>
      Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5d67c1c5
    • Yuval Mintz's avatar
      bnx2x: Correct asymmetric flow-control · 1359d73c
      Yuval Mintz authored
      This fixes several issues relating to asymmetric configuration:
       1. When user requests to disable TX, the local-device needs to
          advertise both PAUSE and ASM_DIR, but to avoid transmitting pause
          frames. In the 578xx, it would ignore the TX disable.
      
       2. When user advertises RX-only, ASM_DIR was advertised instead of
          PAUSE/ASM_DIR.
      
       3. When changing mode, the advertised PAUSE/ASM_DIR was not cleared
          before setting new one, so disabling RX or TX had no impact on the
          'advertised' as appeared in the 'ethtool -a' output.
      Signed-off-by: default avatarYaniv Rosner <Yaniv.Rosner@qlogic.com>
      Signed-off-by: default avatarYuval Mintz <Yuval.Mintz@qlogic.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1359d73c
    • Jamal Hadi Salim's avatar
      net: sched: flower fix typo · b175c3a4
      Jamal Hadi Salim authored
      Fix typo in the validation rules for flower's attributes
      Signed-off-by: default avatarJamal Hadi Salim <jhs@mojatatu.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b175c3a4
    • Govindarajulu Varadarajan's avatar
      enic: use atomic_t instead of spin_lock in busy poll · f586a336
      Govindarajulu Varadarajan authored
      We use spinlock to access a single flag. We can avoid spin_locks by using
      atomic variable and atomic_cmpxchg(). Use atomic_cmpxchg to set the flag
      for idle to poll. And a simple atomic_set to unlock (set idle from poll).
      
      In napi poll, if gro is enabled, we call napi_gro_receive() to deliver the
      packets. Before we call napi_complete(), i.e while re-polling, if low
      latency busy poll is called, we use netif_receive_skb() to deliver the packets.
      At this point if there are some skb's held in GRO, busy poll could deliver the
      packets out of order. So we call napi_gro_flush() to flush skbs before we
      move the napi poll to idle.
      Signed-off-by: default avatarGovindarajulu Varadarajan <_govind@gmx.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f586a336
    • Shaohui Xie's avatar
      net/phy: Add Vitesse 8641 phy ID · 1298267b
      Shaohui Xie authored
      Vitesse VSC8641 is compatible with Vitesse 82xx
      Signed-off-by: default avatarShaohui Xie <Shaohui.Xie@freescale.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1298267b
    • Alison Wang's avatar
      net/fsl: remove dependency FSL_SOC for Gianfar · bbc65bf7
      Alison Wang authored
      CONFIG_GIANFAR is not depended on FSL_SOC, it
      can be built on non-PPC platforms.
      Signed-off-by: default avatarAlison Wang <alison.wang@freescale.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bbc65bf7
    • Dan Carpenter's avatar
      cavium/liquidio: fix some error handling in lio_set_phys_id() · cbdb9777
      Dan Carpenter authored
      There was a missing assignment so the "if (ret)" on the next line is
      never true.
      
      Fixes: f21fb3ed ('Add support of Cavium Liquidio ethernet adapters')
      Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cbdb9777
    • Dan Carpenter's avatar
      renesas: missing unlock on error path · 5102e237
      Dan Carpenter authored
      We need to unlock before returning here.
      
      Fixes: a0d2f206 ('Renesas Ethernet AVB PTP clock driver')
      Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
      Acked-by: default avatarSergei Shtylyov <sergei.shtylyov@cogentembedded.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5102e237
    • David S. Miller's avatar
      Merge branch 'mlx4' · be35ffa3
      David S. Miller authored
      Or Gerlitz says:
      
      ====================
      mlx4 driver fixes, June 24, 2015
      
      Some fixes that we made recently, all need to go into stable.
      
      patch #1 "net/mlx4_en: Release TX QP when destroying TX ring" and patch #3
      "Fix wrong csum complete report when rxvlan offload is disabled" to >= 3.19
      
      patch #2 "Wake TX queues only when there's enough room" addressing a bug
      which is there from day one... should go to whatever kernels it's still applicable
      
      patch #4 "mlx4: Disable HA for SRIOV PF RoCE devices" to >= 4.0
      
      The patches are marked with net but are made against net-next,
      as the net tree still doesn't contain all the net-next bits.
      ====================
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      be35ffa3
    • Or Gerlitz's avatar
      mlx4: Disable HA for SRIOV PF RoCE devices · 7254acff
      Or Gerlitz authored
      When in HA mode, the driver exposes an IB (RoCE) device instance with only
      one port. Under SRIOV, the existing implementation doesn't go well with
      the PF RoCE driver's role of Special QPs Para-Virtualization, etc.
      
      As such, disable HA for the mlx4 PF RoCE device in SRIOV mode.
      
      Fixes: a5750090 ('IB/mlx4: Add port aggregation support')
      Signed-off-by: default avatarOr Gerlitz <ogerlitz@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7254acff
    • Ido Shamay's avatar
      net/mlx4_en: Fix wrong csum complete report when rxvlan offload is disabled · 79a25852
      Ido Shamay authored
      The check_csum() function relied on hwtstamp_rx_filter to know if rxvlan
      offload is disabled. This is wrong since rxvlan offload can be switched
      on/off regardless of hwtstamp_rx_filter.
      
      Also moved check_csum to query CQE information to identify VLAN packets
      and removed the check of IP packets, since it has been validated before.
      
      Fixes: f8c6455b ('net/mlx4_en: Extend checksum offloading by CHECKSUM COMPLETE')
      Signed-off-by: default avatarIdo Shamay <idos@mellanox.com>
      Signed-off-by: default avatarOr Gerlitz <ogerlitz@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      79a25852
    • Ido Shamay's avatar
      net/mlx4_en: Wake TX queues only when there's enough room · 488a9b48
      Ido Shamay authored
      Indication of a single completed packet, marked by txbbs_skipped
      being bigger then zero, in not enough in order to wake up a
      stopped TX queue. The completed packet may contain a single TXBB,
      while next packet to be sent (after the wake up) may have multiple
      TXBBs (LSO/TSO packets for example), causing overflow in queue followed
      by WQE corruption and TX queue timeout.
      Instead, wake the stopped queue only when there's enough room for the
      worst case (maximum sized WQE) packet that we should need to handle after
      the queue is opened again.
      
      Also created an helper routine - mlx4_en_is_tx_ring_full, which checks
      if the current TX ring is full or not. It provides better code readability
      and removes code duplication.
      Signed-off-by: default avatarIdo Shamay <idos@mellanox.com>
      Signed-off-by: default avatarOr Gerlitz <ogerlitz@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      488a9b48
    • Eran Ben Elisha's avatar
      net/mlx4_en: Release TX QP when destroying TX ring · 0eb08514
      Eran Ben Elisha authored
      TX ring QP wasn't released at mlx4_en_destroy_tx_ring. Instead, the code
      used the deprecated base_tx_qpn field. Move TX QP release to
      mlx4_en_destroy_tx_ring and remove the base_tx_qpn field.
      
      Fixes: ddae0349 ('net/mlx4: Change QP allocation scheme')
      Signed-off-by: default avatarEran Ben Elisha <eranbe@mellanox.com>
      Signed-off-by: default avatarOr Gerlitz <ogerlitz@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0eb08514
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · aefbef10
      Linus Torvalds authored
      Merge first patchbomb from Andrew Morton:
      
       - a few misc things
      
       - ocfs2 udpates
      
       - kernel/watchdog.c feature work (took ages to get right)
      
       - most of MM.  A few tricky bits are held up and probably won't make 4.2.
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (91 commits)
        mm: kmemleak_alloc_percpu() should follow the gfp from per_alloc()
        mm, thp: respect MPOL_PREFERRED policy with non-local node
        tmpfs: truncate prealloc blocks past i_size
        mm/memory hotplug: print the last vmemmap region at the end of hot add memory
        mm/mmap.c: optimization of do_mmap_pgoff function
        mm: kmemleak: optimise kmemleak_lock acquiring during kmemleak_scan
        mm: kmemleak: avoid deadlock on the kmemleak object insertion error path
        mm: kmemleak: do not acquire scan_mutex in kmemleak_do_cleanup()
        mm: kmemleak: fix delete_object_*() race when called on the same memory block
        mm: kmemleak: allow safe memory scanning during kmemleak disabling
        memcg: convert mem_cgroup->under_oom from atomic_t to int
        memcg: remove unused mem_cgroup->oom_wakeups
        frontswap: allow multiple backends
        x86, mirror: x86 enabling - find mirrored memory ranges
        mm/memblock: allocate boot time data structures from mirrored memory
        mm/memblock: add extra "flags" to memblock to allow selection of memory based on attribute
        mm: do not ignore mapping_gfp_mask in page cache allocation paths
        mm/cma.c: fix typos in comments
        mm/oom_kill.c: print points as unsigned int
        mm/hugetlb: handle races in alloc_huge_page and hugetlb_reserve_pages
        ...
      aefbef10
    • Linus Torvalds's avatar
      Merge tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux · 266da6f1
      Linus Torvalds authored
      Pull pstore updates from Tony Luck:
       "Miscellaneous pstore improvements"
      
      * tag 'please-pull-pstore' of git://git.kernel.org/pub/scm/linux/kernel/git/aegl/linux:
        ramoops: make it possible to change mem_type param.
        pstore/ram: verify ramoops header before saving record
        fs/pstore: Optimization function ramoops_init_przs
        fs/pstore: update the backend parameter in pstore module
        pstore: do not use message compression without lock
      266da6f1
    • Linus Torvalds's avatar
      Merge tag 'for-f2fs-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs · cfcc0ad4
      Linus Torvalds authored
      Pull f2fs updates from Jaegeuk Kim:
       "New features:
         - per-file encryption (e.g., ext4)
         - FALLOC_FL_ZERO_RANGE
         - FALLOC_FL_COLLAPSE_RANGE
         - RENAME_WHITEOUT
      
        Major enhancement/fixes:
         - recovery broken superblocks
         - enhance f2fs_trim_fs with a discard_map
         - fix a race condition on dentry block allocation
         - fix a deadlock during summary operation
         - fix a missing fiemap result
      
        .. and many minor bug fixes and clean-ups were done"
      
      * tag 'for-f2fs-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs: (83 commits)
        f2fs: do not trim preallocated blocks when truncating after i_size
        f2fs crypto: add alloc_bounce_page
        f2fs crypto: fix to handle errors likewise ext4
        f2fs: drop the volatile_write flag only
        f2fs: skip committing valid superblock
        f2fs: setting discard option in parse_options()
        f2fs: fix to return exact trimmed size
        f2fs: support FALLOC_FL_INSERT_RANGE
        f2fs: hide common code in f2fs_replace_block
        f2fs: disable the discard option when device doesn't support
        f2fs crypto: remove alloc_page for bounce_page
        f2fs: fix a deadlock for summary page lock vs. sentry_lock
        f2fs crypto: clean up error handling in f2fs_fname_setup_filename
        f2fs crypto: avoid f2fs_inherit_context for symlink
        f2fs crypto: do not set encryption policy for non-directory by ioctl
        f2fs crypto: allow setting encryption policy once
        f2fs crypto: check context consistent for rename2
        f2fs: avoid duplicated code by reusing f2fs_read_end_io
        f2fs crypto: use per-inode tfm structure
        f2fs: recovering broken superblock during mount
        ...
      cfcc0ad4
    • Linus Torvalds's avatar
      Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs · a7296b49
      Linus Torvalds authored
      Pull UDF fixes and cleanups from Jan Kara:
       "The contains some small fixes and improvements in error handling for
        UDF.
      
        Bundled is also one ext3 coding style fix and a fix in quota
        documentation"
      
      * 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jack/linux-fs:
        udf: fix udf_load_pvoldesc()
        udf: remove double err declaration in udf_file_write_iter()
        UDF: support NFSv2 export
        fs: ext3: super: fixed a space coding style issue
        quota: Update documentation
        udf: Return error from udf_find_entry()
        udf: Make udf_get_filename() return error instead of 0 length file name
        udf: bug on exotic flag in udf_get_filename()
        udf: improve error management in udf_CS0toNLS()
        udf: improve error management in udf_CS0toUTF8()
        udf: unicode: update function name in comments
        udf: remove unnecessary test in udf_build_ustr_exact()
        udf: Return -ENOMEM when allocation fails in udf_get_filename()
      a7296b49
    • Linus Torvalds's avatar
      Merge tag 'docs-for-linus' of git://git.lwn.net/linux-2.6 · 1e467e68
      Linus Torvalds authored
      Pull documentation updates from Jonathan Corbet:
       "The main thing here is Ingo's big subdirectory documenting feature
        support for each architecture.  Beyond that, it's the usual pile of
        fixes, tweaks, and small additions"
      
      * tag 'docs-for-linus' of git://git.lwn.net/linux-2.6: (79 commits)
        doc:md: fix typo in md.txt.
        Documentation/mic/mpssd: don't build x86 userspace when cross compiling
        Documentation/prctl: don't build tsc tests when cross compiling
        Documentation/vDSO: don't build tests when cross compiling
        Doc:ABI/testing: Fix typo in sysfs-bus-fcoe
        Doc: Docbook: Change wikipedia's URL from http to https in scsi.tmpl
        Doc: Change wikipedia's URL from http to https
        Documentation/kernel-parameters: add missing pciserial to the earlyprintk
        Doc:pps: Fix typo in pps.txt
        kbuild : Fix documentation of INSTALL_HDR_PATH
        Documentation: filesystems: updated struct file_operations documentation in vfs.txt
        kbuild: edit explanation of clean-files variable
        Doc: ja_JP: Fix typo in HOWTO
        Move freefall program from Documentation/ to tools/
        Documentation: ARM: EXYNOS: Describe boot loaders interface
        Doc:nfc: Fix typo in nfc-hci.txt
        vfs: Minor documentation fix
        Doc: networking: txtimestamp: fix printf format warning
        Documentation, intel_pstate: Improve legacy mode internal governors description
        Documentation: extend use case for EXPORT_SYMBOL_GPL()
        ...
      1e467e68
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input · 14738e03
      Linus Torvalds authored
      Pull input subsystem updates from Dmitry Torokhov:
       "Thanks to Samuel Thibault input device (keyboard) LEDs are no longer
        hardwired within the input core but use LED subsystem and so allow use
        of different triggers; Hans de Goede did a large update for the ALPS
        touchpad driver; we have new TI drv2665 haptics driver and DA9063
        OnKey driver, and host of other drivers got various fixes"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input: (55 commits)
        Input: pixcir_i2c_ts - fix receive error
        MAINTAINERS: remove non existent input mt git tree
        Input: improve usage of gpiod API
        tty/vt/keyboard: define LED triggers for VT keyboard lock states
        tty/vt/keyboard: define LED triggers for VT LED states
        Input: export LEDs as class devices in sysfs
        Input: cyttsp4 - use swap() in cyttsp4_get_touch()
        Input: goodix - do not explicitly set evbits in input device
        Input: goodix - export id and version read from device
        Input: goodix - fix variable length array warning
        Input: goodix - fix alignment issues
        Input: add OnKey driver for DA9063 MFD part
        Input: elan_i2c - add product IDs FW names
        Input: elan_i2c - add support for multi IC type and iap format
        Input: focaltech - report finger width to userspace
        tty: remove platform_sysrq_reset_seq
        Input: synaptics_i2c - use proper boolean values
        Input: psmouse - use true instead of 1 for boolean values
        Input: cyapa - fix a few typos in comments
        Input: stmpe-ts - enforce device tree only mode
        ...
      14738e03
    • Linus Torvalds's avatar
      Merge tag 'edac_for_4.2_2' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp · 45471cd9
      Linus Torvalds authored
      Pull EDAC updates from Borislav Petkov:
      
       - New APM X-Gene SoC EDAC driver (Loc Ho)
      
       - AMD error injection module improvements (Aravind Gopalakrishnan)
      
       - Altera Arria 10 support (Thor Thayer)
      
       - misc fixes and cleanups all over the place
      
      * tag 'edac_for_4.2_2' of git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp: (28 commits)
        EDAC: Update Documentation/edac.txt
        EDAC: Fix typos in Documentation/edac.txt
        EDAC, mce_amd_inj: Set MISCV on injection
        EDAC, mce_amd_inj: Move bit preparations before the injection
        EDAC, mce_amd_inj: Cleanup and simplify README
        EDAC, altera: Do not allow suspend when EDAC is enabled
        EDAC, mce_amd_inj: Make inj_type static
        arm: socfpga: dts: Add Arria10 SDRAM EDAC DTS support
        EDAC, altera: Add Arria10 EDAC support
        EDAC, altera: Refactor for Altera CycloneV SoC
        EDAC, altera: Generalize driver to use DT Memory size
        EDAC, mce_amd_inj: Add README file
        EDAC, mce_amd_inj: Add individual permissions field to dfs_node
        EDAC, mce_amd_inj: Modify flags attribute to use string arguments
        EDAC, mce_amd_inj: Read out number of MCE banks from the hardware
        EDAC, mce_amd_inj: Use MCE_INJECT_GET macro for bank node too
        EDAC, xgene: Fix cpuid abuse
        EDAC, mpc85xx: Extend error address to 64 bit
        EDAC, mpc8xxx: Adapt for FSL SoC
        EDAC, edac_stub: Drop arch-specific include
        ...
      45471cd9
    • Linus Torvalds's avatar
      Merge tag 'pinctrl-v4.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl · 93a4b1b9
      Linus Torvalds authored
      Pull pin control updates from Linus Walleij:
       "Here is the bulk of pin control changes for the v4.2 series: Quite a
        lot of new SoC subdrivers and two new main drivers this time, apart
        from that business as usual.
      
        Details:
      
        Core functionality:
         - Enable exclusive pin ownership: it is possible to flag a pin
           controller so that GPIO and other functions cannot use a single pin
           simultaneously.
      
        New drivers:
         - NXP LPC18xx System Control Unit pin controller
         - Imagination Pistachio SoC pin controller
      
        New subdrivers:
         - Freescale i.MX7d SoC
         - Intel Sunrisepoint-H PCH
         - Renesas PFC R8A7793
         - Renesas PFC R8A7794
         - Mediatek MT6397, MT8127
         - SiRF Atlas 7
         - Allwinner A33
         - Qualcomm MSM8660
         - Marvell Armada 395
         - Rockchip RK3368
      
        Cleanups:
         - A big cleanup of the Marvell MVEBU driver rectifying it to
           correspond to reality
         - Drop platform device probing from the SH PFC driver, we are now a
           DT only shop for SuperH
         - Drop obsolte multi-platform check for SH PFC
         - Various janitorial: constification, grammar etc
      
        Improvements:
         - The AT91 GPIO portions now supports the set_multiple() feature
         - Split out SPI pins on the Xilinx Zynq
         - Support DTs without specific function nodes in the i.MX driver"
      
      * tag 'pinctrl-v4.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl: (99 commits)
        pinctrl: rockchip: add support for the rk3368
        pinctrl: rockchip: generalize perpin driver-strength setting
        pinctrl: sh-pfc: r8a7794: add SDHI pin groups
        pinctrl: sh-pfc: r8a7794: add MMCIF pin groups
        pinctrl: sh-pfc: add R8A7794 PFC support
        pinctrl: make pinctrl_register() return proper error code
        pinctrl: mvebu: armada-39x: add support for Armada 395 variant
        pinctrl: mvebu: armada-39x: add missing SATA functions
        pinctrl: mvebu: armada-39x: add missing PCIe functions
        pinctrl: mvebu: armada-38x: add ptp functions
        pinctrl: mvebu: armada-38x: add ua1 functions
        pinctrl: mvebu: armada-38x: add nand functions
        pinctrl: mvebu: armada-38x: add sata functions
        pinctrl: mvebu: armada-xp: add dram functions
        pinctrl: mvebu: armada-xp: add nand rb function
        pinctrl: mvebu: armada-xp: add spi1 function
        pinctrl: mvebu: armada-39x: normalize ref clock naming
        pinctrl: mvebu: armada-xp: rename spi to spi0
        pinctrl: mvebu: armada-370: align spi1 clock pin naming
        pinctrl: mvebu: armada-370: align VDD cpu-pd pin naming with datasheet
        ...
      93a4b1b9
    • Linus Torvalds's avatar
      Merge tag 'backlight-for-linus-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight · d59b92f9
      Linus Torvalds authored
      Pull backlight updates from Lee Jones:
       "Changes to existing drivers:
      
         - supply MODULE_DEVICE_TABLE() to ensure probing
         - constify struct; da9052_bl
         - enable compile test; lcd_l4f00242t03, lcd_lms283fg05, backlight_gpio
         - suspend/resume bugfix; lp855x_bl
         - devm_gpiod_get_optional() API fixup; pwm_bl
         - error handling fixup; backlight"
      
      * tag 'backlight-for-linus-4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/lee/backlight:
        backlight: Change the return type of backlight_update_status() to int
        backlight: pwm_bl: Simplify usage of devm_gpiod_get_optional
        backlight: lp855x: Don't clear level on suspend/blank
        backlight: Allow compile test of GPIO consumers if !GPIOLIB
        video: backlight: da9052: Constify platform_device_id
        gpio-backlight: Discover driver during boot time
      d59b92f9
    • Larry Finger's avatar
      mm: kmemleak_alloc_percpu() should follow the gfp from per_alloc() · 8a8c35fa
      Larry Finger authored
      Beginning at commit d52d3997 ("ipv6: Create percpu rt6_info"), the
      following INFO splat is logged:
      
        ===============================
        [ INFO: suspicious RCU usage. ]
        4.1.0-rc7-next-20150612 #1 Not tainted
        -------------------------------
        kernel/sched/core.c:7318 Illegal context switch in RCU-bh read-side critical section!
        other info that might help us debug this:
        rcu_scheduler_active = 1, debug_locks = 0
         3 locks held by systemd/1:
         #0:  (rtnl_mutex){+.+.+.}, at: [<ffffffff815f0c8f>] rtnetlink_rcv+0x1f/0x40
         #1:  (rcu_read_lock_bh){......}, at: [<ffffffff816a34e2>] ipv6_add_addr+0x62/0x540
         #2:  (addrconf_hash_lock){+...+.}, at: [<ffffffff816a3604>] ipv6_add_addr+0x184/0x540
        stack backtrace:
        CPU: 0 PID: 1 Comm: systemd Not tainted 4.1.0-rc7-next-20150612 #1
        Hardware name: TOSHIBA TECRA A50-A/TECRA A50-A, BIOS Version 4.20   04/17/2014
        Call Trace:
          dump_stack+0x4c/0x6e
          lockdep_rcu_suspicious+0xe7/0x120
          ___might_sleep+0x1d5/0x1f0
          __might_sleep+0x4d/0x90
          kmem_cache_alloc+0x47/0x250
          create_object+0x39/0x2e0
          kmemleak_alloc_percpu+0x61/0xe0
          pcpu_alloc+0x370/0x630
      
      Additional backtrace lines are truncated.  In addition, the above splat
      is followed by several "BUG: sleeping function called from invalid
      context at mm/slub.c:1268" outputs.  As suggested by Martin KaFai Lau,
      these are the clue to the fix.  Routine kmemleak_alloc_percpu() always
      uses GFP_KERNEL for its allocations, whereas it should follow the gfp
      from its callers.
      Reviewed-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Reviewed-by: default avatarKamalesh Babulal <kamalesh@linux.vnet.ibm.com>
      Acked-by: default avatarMartin KaFai Lau <kafai@fb.com>
      Signed-off-by: default avatarLarry Finger <Larry.Finger@lwfinger.net>
      Cc: Martin KaFai Lau <kafai@fb.com>
      Cc: Catalin Marinas <catalin.marinas@arm.com>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: Christoph Lameter <cl@linux-foundation.org>
      Cc: <stable@vger.kernel.org>	[3.18+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8a8c35fa
    • Vlastimil Babka's avatar
      mm, thp: respect MPOL_PREFERRED policy with non-local node · 0867a57c
      Vlastimil Babka authored
      Since commit 077fcf11 ("mm/thp: allocate transparent hugepages on
      local node"), we handle THP allocations on page fault in a special way -
      for non-interleave memory policies, the allocation is only attempted on
      the node local to the current CPU, if the policy's nodemask allows the
      node.
      
      This is motivated by the assumption that THP benefits cannot offset the
      cost of remote accesses, so it's better to fallback to base pages on the
      local node (which might still be available, while huge pages are not due
      to fragmentation) than to allocate huge pages on a remote node.
      
      The nodemask check prevents us from violating e.g.  MPOL_BIND policies
      where the local node is not among the allowed nodes.  However, the
      current implementation can still give surprising results for the
      MPOL_PREFERRED policy when the preferred node is different than the
      current CPU's local node.
      
      In such case we should honor the preferred node and not use the local
      node, which is what this patch does.  If hugepage allocation on the
      preferred node fails, we fall back to base pages and don't try other
      nodes, with the same motivation as is done for the local node hugepage
      allocations.  The patch also moves the MPOL_INTERLEAVE check around to
      simplify the hugepage specific test.
      
      The difference can be demonstrated using in-tree transhuge-stress test
      on the following 2-node machine where half memory on one node was
      occupied to show the difference.
      
      > numactl --hardware
      available: 2 nodes (0-1)
      node 0 cpus: 0 1 2 3 4 5 6 7 8 9 10 11 24 25 26 27 28 29 30 31 32 33 34 35
      node 0 size: 7878 MB
      node 0 free: 3623 MB
      node 1 cpus: 12 13 14 15 16 17 18 19 20 21 22 23 36 37 38 39 40 41 42 43 44 45 46 47
      node 1 size: 8045 MB
      node 1 free: 7818 MB
      node distances:
      node   0   1
        0:  10  21
        1:  21  10
      
      Before the patch:
      > numactl -p0 -C0 ./transhuge-stress
      transhuge-stress: 2.197 s/loop, 0.276 ms/page,   7249.168 MiB/s 7962 succeed,    0 failed, 1786 different pages
      
      > numactl -p0 -C12 ./transhuge-stress
      transhuge-stress: 2.962 s/loop, 0.372 ms/page,   5376.172 MiB/s 7962 succeed,    0 failed, 3873 different pages
      
      Number of successful THP allocations corresponds to free memory on node 0 in
      the first case and node 1 in the second case, i.e. -p parameter is ignored and
      cpu binding "wins".
      
      After the patch:
      > numactl -p0 -C0 ./transhuge-stress
      transhuge-stress: 2.183 s/loop, 0.274 ms/page,   7295.516 MiB/s 7962 succeed,    0 failed, 1760 different pages
      
      > numactl -p0 -C12 ./transhuge-stress
      transhuge-stress: 2.878 s/loop, 0.361 ms/page,   5533.638 MiB/s 7962 succeed,    0 failed, 1750 different pages
      
      > numactl -p1 -C0 ./transhuge-stress
      transhuge-stress: 4.628 s/loop, 0.581 ms/page,   3440.893 MiB/s 7962 succeed,    0 failed, 3918 different pages
      
      The -p parameter is respected regardless of cpu binding.
      
      > numactl -C0 ./transhuge-stress
      transhuge-stress: 2.202 s/loop, 0.277 ms/page,   7230.003 MiB/s 7962 succeed,    0 failed, 1750 different pages
      
      > numactl -C12 ./transhuge-stress
      transhuge-stress: 3.020 s/loop, 0.379 ms/page,   5273.324 MiB/s 7962 succeed,    0 failed, 3916 different pages
      
      Without -p parameter, hugepage restriction to CPU-local node works as before.
      
      Fixes: 077fcf11 ("mm/thp: allocate transparent hugepages on local node")
      Signed-off-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: <stable@vger.kernel.org>	[4.0+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0867a57c
    • Josef Bacik's avatar
      tmpfs: truncate prealloc blocks past i_size · afa2db2f
      Josef Bacik authored
      One of the rocksdb people noticed that when you do something like this
      
          fallocate(fd, FALLOC_FL_KEEP_SIZE, 0, 10M)
          pwrite(fd, buf, 5M, 0)
          ftruncate(5M)
      
      on tmpfs, the file would still take up 10M: which led to super fun
      issues because we were getting ENOSPC before we thought we should be
      getting ENOSPC.  This patch fixes the problem, and mirrors what all the
      other fs'es do (and was agreed to be the correct behaviour at LSF).
      
      I tested it locally to make sure it worked properly with the following
      
          xfs_io -f -c "falloc -k 0 10M" -c "pwrite 0 5M" -c "truncate 5M" file
      
      Without the patch we have "Blocks: 20480", with the patch we have the
      correct value of "Blocks: 10240".
      Signed-off-by: default avatarJosef Bacik <jbacik@fb.com>
      Signed-off-by: default avatarHugh Dickins <hughd@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      afa2db2f
    • Zhu Guihua's avatar
      mm/memory hotplug: print the last vmemmap region at the end of hot add memory · c435a390
      Zhu Guihua authored
      When hot add two nodes continuously, we found the vmemmap region info is
      a bit messed.  The last region of node 2 is printed when node 3 hot
      added, like the following:
      
        Initmem setup node 2 [mem 0x0000000000000000-0xffffffffffffffff]
         On node 2 totalpages: 0
         Built 2 zonelists in Node order, mobility grouping on.  Total pages: 16090539
         Policy zone: Normal
         init_memory_mapping: [mem 0x40000000000-0x407ffffffff]
          [mem 0x40000000000-0x407ffffffff] page 1G
          [ffffea1000000000-ffffea10001fffff] PMD -> [ffff8a077d800000-ffff8a077d9fffff] on node 2
          [ffffea1000200000-ffffea10003fffff] PMD -> [ffff8a077de00000-ffff8a077dffffff] on node 2
        ...
          [ffffea101f600000-ffffea101f9fffff] PMD -> [ffff8a074ac00000-ffff8a074affffff] on node 2
          [ffffea101fa00000-ffffea101fdfffff] PMD -> [ffff8a074a800000-ffff8a074abfffff] on node 2
        Initmem setup node 3 [mem 0x0000000000000000-0xffffffffffffffff]
         On node 3 totalpages: 0
         Built 3 zonelists in Node order, mobility grouping on.  Total pages: 16090539
         Policy zone: Normal
         init_memory_mapping: [mem 0x60000000000-0x607ffffffff]
          [mem 0x60000000000-0x607ffffffff] page 1G
          [ffffea101fe00000-ffffea101fffffff] PMD -> [ffff8a074a400000-ffff8a074a5fffff] on node 2 <=== node 2 ???
          [ffffea1800000000-ffffea18001fffff] PMD -> [ffff8a074a600000-ffff8a074a7fffff] on node 3
          [ffffea1800200000-ffffea18005fffff] PMD -> [ffff8a074a000000-ffff8a074a3fffff] on node 3
          [ffffea1800600000-ffffea18009fffff] PMD -> [ffff8a0749c00000-ffff8a0749ffffff] on node 3
        ...
      
      The cause is the last region was missed at the and of hot add memory,
      and p_start, p_end, node_start were not reset, so when hot add memory to
      a new node, it will consider they are not contiguous blocks and print
      the previous one.  So we print the last vmemmap region at the end of hot
      add memory to avoid the confusion.
      Signed-off-by: default avatarZhu Guihua <zhugh.fnst@cn.fujitsu.com>
      Reviewed-by: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c435a390
    • Piotr Kwapulinski's avatar
      mm/mmap.c: optimization of do_mmap_pgoff function · e37609bb
      Piotr Kwapulinski authored
      The simple check for zero length memory mapping may be performed
      earlier.  So that in case of zero length memory mapping some unnecessary
      code is not executed at all.  It does not make the code less readable
      and saves some CPU cycles.
      Signed-off-by: default avatarPiotr Kwapulinski <kwapulinski.piotr@gmail.com>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Acked-by: default avatarRik van Riel <riel@redhat.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e37609bb
    • Catalin Marinas's avatar
      mm: kmemleak: optimise kmemleak_lock acquiring during kmemleak_scan · 93ada579
      Catalin Marinas authored
      The kmemleak memory scanning uses finer grained object->lock spinlocks
      primarily to avoid races with the memory block freeing.  However, the
      pointer lookup in the rb tree requires the kmemleak_lock to be held.
      This is currently done in the find_and_get_object() function for each
      pointer-like location read during scanning.  While this allows a low
      latency on kmemleak_*() callbacks on other CPUs, the memory scanning is
      slower.
      
      This patch moves the kmemleak_lock outside the scan_block() loop,
      acquiring/releasing it only once per scanned memory block.  The
      allow_resched logic is moved outside scan_block() and a new
      scan_large_block() function is implemented which splits large blocks in
      MAX_SCAN_SIZE chunks with cond_resched() calls in-between.  A redundant
      (object->flags & OBJECT_NO_SCAN) check is also removed from
      scan_object().
      
      With this patch, the kmemleak scanning performance is significantly
      improved: at least 50% with lock debugging disabled and over an order of
      magnitude with lock proving enabled (on an arm64 system).
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      93ada579
    • Catalin Marinas's avatar
      mm: kmemleak: avoid deadlock on the kmemleak object insertion error path · 9d5a4c73
      Catalin Marinas authored
      While very unlikely (usually kmemleak or sl*b bug), the create_object()
      function in mm/kmemleak.c may fail to insert a newly allocated object into
      the rb tree.  When this happens, kmemleak disables itself and prints
      additional information about the object already found in the rb tree.
      Such printing is done with the parent->lock acquired, however the
      kmemleak_lock is already held.  This is a potential race with the scanning
      thread which acquires object->lock and kmemleak_lock in a
      
      This patch removes the locking around the 'parent' object information
      printing.  Such object cannot be freed or removed from object_tree_root
      and object_list since kmemleak_lock is already held.  There is a very
      small risk that some of the object data is being modified on another CPU
      but the only downside is inconsistent information printing.
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9d5a4c73
    • Catalin Marinas's avatar
      mm: kmemleak: do not acquire scan_mutex in kmemleak_do_cleanup() · 5f369f37
      Catalin Marinas authored
      The kmemleak_do_cleanup() work thread already waits for the kmemleak_scan
      thread to finish via kthread_stop().  Waiting in kthread_stop() while
      scan_mutex is held may lead to deadlock if kmemleak_scan_thread() also
      waits to acquire for scan_mutex.
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5f369f37
    • Catalin Marinas's avatar
      mm: kmemleak: fix delete_object_*() race when called on the same memory block · e781a9ab
      Catalin Marinas authored
      Calling delete_object_*() on the same pointer is not a standard use case
      (unless there is a bug in the code calling kmemleak_free()).  However,
      during kmemleak disabling (error or user triggered via /sys), there is a
      potential race between kmemleak_free() calls on a CPU and
      __kmemleak_do_cleanup() on a different CPU.
      
      The current delete_object_*() implementation first performs a look-up
      holding kmemleak_lock, increments the object->use_count and then
      re-acquires kmemleak_lock to remove the object from object_tree_root and
      object_list.
      
      This patch simplifies the delete_object_*() mechanism to both look up
      and remove an object from the object_tree_root and object_list
      atomically (guarded by kmemleak_lock).  This allows safe concurrent
      calls to delete_object_*() on the same pointer without additional
      locking for synchronising the kmemleak_free_enabled flag.
      
      A side effect is a slight improvement in the delete_object_*() performance
      by avoiding acquiring kmemleak_lock twice and incrementing/decrementing
      object->use_count.
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      e781a9ab
    • Catalin Marinas's avatar
      mm: kmemleak: allow safe memory scanning during kmemleak disabling · c5f3b1a5
      Catalin Marinas authored
      The kmemleak scanning thread can run for minutes.  Callbacks like
      kmemleak_free() are allowed during this time, the race being taken care
      of by the object->lock spinlock.  Such lock also prevents a memory block
      from being freed or unmapped while it is being scanned by blocking the
      kmemleak_free() -> ...  -> __delete_object() function until the lock is
      released in scan_object().
      
      When a kmemleak error occurs (e.g.  it fails to allocate its metadata),
      kmemleak_enabled is set and __delete_object() is no longer called on
      freed objects.  If kmemleak_scan is running at the same time,
      kmemleak_free() no longer waits for the object scanning to complete,
      allowing the corresponding memory block to be freed or unmapped (in the
      case of vfree()).  This leads to kmemleak_scan potentially triggering a
      page fault.
      
      This patch separates the kmemleak_free() enabling/disabling from the
      overall kmemleak_enabled nob so that we can defer the disabling of the
      object freeing tracking until the scanning thread completed.  The
      kmemleak_free_part() is deliberately ignored by this patch since this is
      only called during boot before the scanning thread started.
      Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Reported-by: default avatarVignesh Radhakrishnan <vigneshr@codeaurora.org>
      Tested-by: default avatarVignesh Radhakrishnan <vigneshr@codeaurora.org>
      Cc: <stable@vger.kernel.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c5f3b1a5
    • Tejun Heo's avatar
      memcg: convert mem_cgroup->under_oom from atomic_t to int · c2b42d3c
      Tejun Heo authored
      memcg->under_oom tracks whether the memcg is under OOM conditions and is
      an atomic_t counter managed with mem_cgroup_[un]mark_under_oom().  While
      atomic_t appears to be simple synchronization-wise, when used as a
      synchronization construct like here, it's trickier and more error-prone
      due to weak memory ordering rules, especially around atomic_read(), and
      false sense of security.
      
      For example, both non-trivial read sites of memcg->under_oom are a bit
      problematic although not being actually broken.
      
      * mem_cgroup_oom_register_event()
      
        It isn't explicit what guarantees the memory ordering between event
        addition and memcg->under_oom check.  This isn't broken only because
        memcg_oom_lock is used for both event list and memcg->oom_lock.
      
      * memcg_oom_recover()
      
        The lockless test doesn't have any explanation why this would be
        safe.
      
      mem_cgroup_[un]mark_under_oom() are very cold paths and there's no point
      in avoiding locking memcg_oom_lock there.  This patch converts
      memcg->under_oom from atomic_t to int, puts their modifications under
      memcg_oom_lock and documents why the lockless test in
      memcg_oom_recover() is safe.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c2b42d3c
    • Tejun Heo's avatar
      memcg: remove unused mem_cgroup->oom_wakeups · f4b90b70
      Tejun Heo authored
      Since commit 49426420 ("mm: memcg: handle non-error OOM situations
      more gracefully"), nobody uses mem_cgroup->oom_wakeups.  Remove it.
      
      While at it, also fold memcg_wakeup_oom() into memcg_oom_recover() which
      is its only user.  This cleanup was suggested by Michal.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Johannes Weiner <hannes@cmpxchg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f4b90b70
    • Dan Streetman's avatar
      frontswap: allow multiple backends · d1dc6f1b
      Dan Streetman authored
      Change frontswap single pointer to a singly linked list of frontswap
      implementations.  Update Xen tmem implementation as register no longer
      returns anything.
      
      Frontswap only keeps track of a single implementation; any
      implementation that registers second (or later) will replace the
      previously registered implementation, and gets a pointer to the previous
      implementation that the new implementation is expected to pass all
      frontswap functions to if it can't handle the function itself.  However
      that method doesn't really make much sense, as passing that work on to
      every implementation adds unnecessary work to implementations; instead,
      frontswap should simply keep a list of all registered implementations
      and try each implementation for any function.  Most importantly, neither
      of the two currently existing frontswap implementations in the kernel
      actually do anything with any previous frontswap implementation that
      they replace when registering.
      
      This allows frontswap to successfully manage multiple implementations by
      keeping a list of them all.
      Signed-off-by: default avatarDan Streetman <ddstreet@ieee.org>
      Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
      Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
      Cc: David Vrabel <david.vrabel@citrix.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d1dc6f1b
    • Tony Luck's avatar
      x86, mirror: x86 enabling - find mirrored memory ranges · b05b9f5f
      Tony Luck authored
      UEFI GetMemoryMap() uses a new attribute bit to mark mirrored memory
      address ranges.  See UEFI 2.5 spec pages 157-158:
      
        http://www.uefi.org/sites/default/files/resources/UEFI%202_5.pdf
      
      On EFI enabled systems scan the memory map and tell memblock about any
      mirrored ranges.
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      Cc: Xishi Qiu <qiuxishi@huawei.com>
      Cc: Hanjun Guo <guohanjun@huawei.com>
      Cc: Xiexiuqi <xiexiuqi@huawei.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b05b9f5f
    • Tony Luck's avatar
      mm/memblock: allocate boot time data structures from mirrored memory · a3f5bafc
      Tony Luck authored
      Try to allocate all boot time kernel data structures from mirrored
      memory.
      
      If we run out of mirrored memory print warnings, but fall back to using
      non-mirrored memory to make sure that we still boot.
      
      By number of bytes, most of what we allocate at boot time is the page
      structures.  64 bytes per 4K page on x86_64 ...  or about 1.5% of total
      system memory.  For workloads where the bulk of memory is allocated to
      applications this may represent a useful improvement to system
      availability since 1.5% of total memory might be a third of the memory
      allocated to the kernel.
      Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
      Cc: Xishi Qiu <qiuxishi@huawei.com>
      Cc: Hanjun Guo <guohanjun@huawei.com>
      Cc: Xiexiuqi <xiexiuqi@huawei.com>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: "H. Peter Anvin" <hpa@zytor.com>
      Cc: Yinghai Lu <yinghai@kernel.org>
      Cc: Naoya Horiguchi <nao.horiguchi@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      a3f5bafc