1. 26 May, 2016 19 commits
  2. 25 May, 2016 21 commits
    • Jann Horn's avatar
      Yama: fix double-spinlock and user access in atomic context · dca6b414
      Jann Horn authored
      Commit 8a56038c ("Yama: consolidate error reporting") causes lockups
      when someone hits a Yama denial. Call chain:
      
      process_vm_readv -> process_vm_rw -> process_vm_rw_core -> mm_access
      -> ptrace_may_access
      task_lock(...) is taken
      __ptrace_may_access -> security_ptrace_access_check
      -> yama_ptrace_access_check -> report_access -> kstrdup_quotable_cmdline
      -> get_cmdline -> access_process_vm -> get_task_mm
      task_lock(...) is taken again
      
      task_lock(p) just calls spin_lock(&p->alloc_lock), so at this point,
      spin_lock() is called on a lock that is already held by the current
      process.
      
      Also: Since the alloc_lock is a spinlock, sleeping inside
      security_ptrace_access_check hooks is probably not allowed at all? So it's
      not even possible to print the cmdline from in there because that might
      involve paging in userspace memory.
      
      It would be tempting to rewrite ptrace_may_access() to drop the alloc_lock
      before calling the LSM, but even then, ptrace_may_access() itself might be
      called from various contexts in which you're not allowed to sleep; for
      example, as far as I understand, to be able to hold a reference to another
      task, usually an RCU read lock will be taken (see e.g. kcmp() and
      get_robust_list()), so that also prohibits sleeping. (And using e.g. FUSE,
      a user can cause pagefault handling to take arbitrary amounts of time -
      see https://bugs.chromium.org/p/project-zero/issues/detail?id=808.)
      
      Therefore, AFAIK, in order to print the name of a process below
      security_ptrace_access_check(), you'd have to either grab a reference to
      the mm_struct and defer the access violation reporting or just use the
      "comm" value that's stored in kernelspace and accessible without big
      complications. (Or you could try to use some kind of atomic remote VM
      access that fails if the memory isn't paged in, similar to
      copy_from_user_inatomic(), and if necessary fall back to comm, but
      that'd be kind of ugly because the comm/cmdline choice would look
      pretty random to the user.)
      
      Fix it by deferring reporting of the access violation until current
      exits kernelspace the next time.
      
      v2: Don't oops on PTRACE_TRACEME, call report_access under
      task_lock(current). Also fix nonsensical comment. And don't use
      GPF_ATOMIC for memory allocation with no locks held.
      This patch is tested both for ptrace attach and ptrace traceme.
      
      Fixes: 8a56038c ("Yama: consolidate error reporting")
      Signed-off-by: default avatarJann Horn <jann@thejh.net>
      Acked-by: default avatarKees Cook <keescook@chromium.org>
      Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
      dca6b414
    • Linus Torvalds's avatar
      Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · c4a34600
      Linus Torvalds authored
      Pull objtool build fix from Ingo Molnar:
       "An libtool fix for older libelf versions"
      
      * 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        objtool: Allow building with older libelf
      c4a34600
    • Linus Torvalds's avatar
      Merge branch 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · 0985b65d
      Linus Torvalds authored
      Pull vfs iov_iter regression fix from Al Viro:
       "Fix for braino in 'fold checks into iterate_and_advance()'"
      
      * 'work.iov_iter' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
        do "fold checks into iterate_and_advance()" right
      0985b65d
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs · 55c1c7b2
      Linus Torvalds authored
      Pull vfs xattr regression fixes from Al Viro.
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
        make xattr_resolve_handlers() safe to use with NULL ->s_xattr
        xattr: Fail with -EINVAL for NULL attribute names
      55c1c7b2
    • Linus Torvalds's avatar
      Merge tag 'acpi-4.7-rc1-more' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · e92677df
      Linus Torvalds authored
      Pull ACPI fix from Rafael Wysocki:
       "Additional ACPI update for v4.7-rc1
      
        Just one fix for incorrect async_synchronize_cookie() usage in the
        ACPI battery driver (Chris Wilson)"
      
      * tag 'acpi-4.7-rc1-more' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        ACPI / battery: Correctly serialise with the pending async probe
      e92677df
    • Linus Torvalds's avatar
      Merge tag 'pm-4.7-rc1-more' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm · 877c057d
      Linus Torvalds authored
      Pull more power management updates from Rafael Wysocki:
       "These are two stable-candidate fixes (PM core, cpuidle) and a bunch of
        cpufreq cleanups.
      
        Specifics:
      
         - Stable-candidate cpuidle fix to make it check the right variable
           when deciding whether or not to enable interrupts on the local CPU
           so as to avoid enabling iterrupts too early in some cases if the
           system has both coupled and per-core idle states (Daniel Lezcano).
      
         - Stable-candidate PM core fix to make it handle failures at the
           "late suspend" stage of device suspend consistently for all devices
           regardless of whether or not async suspend/resume is enabled for
           them (Rafael Wysocki).
      
         - Cleanups in the cpufreq core, the schedutil governor and the
           intel_pstate driver (Rafael Wysocki, Pankaj Gupta, Viresh Kumar)"
      
      * tag 'pm-4.7-rc1-more' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
        PM / sleep: Handle failures in device_suspend_late() consistently
        cpufreq: schedutil: Improve prints messages with pr_fmt
        cpuidle: Fix cpuidle_state_is_coupled() argument in cpuidle_enter()
        cpufreq: simplified goto out in cpufreq_register_driver()
        cpufreq: governor: CPUFREQ_GOV_STOP never fails
        cpufreq: governor: CPUFREQ_GOV_POLICY_EXIT never fails
        intel_pstate: Simplify conditional in intel_pstate_set_policy()
      877c057d
    • Al Viro's avatar
      do "fold checks into iterate_and_advance()" right · 19f18459
      Al Viro authored
      the only case when we should skip the iterate_and_advance() guts
      is when nothing's left in the iterator, _not_ just when requested
      amount is 0.  Said guts will do nothing in the latter case anyway;
      the problem we tried to deal with in the aforementioned commit is
      that when there's nothing left *and* the amount requested is 0,
      we might end up deferencing one iovec too many; the value we fetch
      from there is discarded in that case, but theoretically it might
      oops if the iovec array ends exactly at the end of page with the
      next page not mapped.
      
      Bailing out on zero size requested had an unexpected side effect -
      zero-length segment in the beginning of iovec array ended up
      throwing do_loop_readv_writev() into infinite spin; we do not
      advance past the empty segment at all.  Reproducer is trivial:
      echo '#include <sys/uio.h>' >a.c
      echo 'main() {char c; struct iovec v[] = {{&c,0},{&c,1}}; readv(0,v,2);}' >>a.c
      cc a.c && ./a.out </proc/uptime
      
      which should end up with the process not hanging.  Probably ought to
      go into LTP or xfstests...
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      19f18459
    • Al Viro's avatar
    • Andreas Gruenbacher's avatar
      xattr: Fail with -EINVAL for NULL attribute names · aaf431b4
      Andreas Gruenbacher authored
      Commit 98e9cb57 improved the xattr name checks in xattr_resolve_name but
      didn't update the NULL attribute name check appropriately, so NULL
      attribute names lead to NULL pointer dereferences.  Turn that into
      -EINVAL results instead.
      Signed-off-by: default avatarAndreas Gruenbacher <agruenba@redhat.com>
        fs/xattr.c | 2 +-
        1 file changed, 1 insertion(+), 1 deletion(-)
      Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
      aaf431b4
    • Rafael J. Wysocki's avatar
      Merge branch 'acpi-battery' · 0cc4b481
      Rafael J. Wysocki authored
      * acpi-battery:
        ACPI / battery: Correctly serialise with the pending async probe
      0cc4b481
    • Rafael J. Wysocki's avatar
      Merge branches 'pm-cpufreq', 'pm-cpuidle' and 'pm-core' · 4c2628cd
      Rafael J. Wysocki authored
      * pm-cpufreq:
        cpufreq: schedutil: Improve prints messages with pr_fmt
        cpufreq: simplified goto out in cpufreq_register_driver()
        cpufreq: governor: CPUFREQ_GOV_STOP never fails
        cpufreq: governor: CPUFREQ_GOV_POLICY_EXIT never fails
        intel_pstate: Simplify conditional in intel_pstate_set_policy()
      
      * pm-cpuidle:
        cpuidle: Fix cpuidle_state_is_coupled() argument in cpuidle_enter()
      
      * pm-core:
        PM / sleep: Handle failures in device_suspend_late() consistently
      4c2628cd
    • Linus Torvalds's avatar
      Merge tag 'pwm/for-4.7-rc1' of... · ecc5fbd5
      Linus Torvalds authored
      Merge tag 'pwm/for-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm
      
      Pull pwm updates from Thierry Reding:
       "This set of changes introduces an atomic API to the PWM subsystem.
        This is influenced by the DRM atomic API that was introduced a while
        back, though it is obviously a lot simpler.  The fundamental idea
        remains the same, though: drivers provide a single callback to
        implement the atomic configuration of a PWM channel.
      
        As a side-effect the PWM subsystem gains the ability for initial state
        retrieval, so that the logical state mirrors that of the hardware.
        Many use-cases don't care about this, but for others it is essential.
      
        These new features require changes in all users, which these patches
        take care of.  The core is transitioned to use the atomic callback if
        available and provides a fallback mechanism for other drivers.
      
        Changes to transition users and drivers to the atomic API are
        postponed to v4.8"
      
      * tag 'pwm/for-4.7-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/thierry.reding/linux-pwm: (30 commits)
        pwm: Add information about polarity, duty cycle and period to debugfs
        pwm: Switch to the atomic API
        pwm: Update documentation
        pwm: Add core infrastructure to allow atomic updates
        pwm: Add hardware readout infrastructure
        pwm: Move the enabled/disabled info into pwm_state
        pwm: Introduce the pwm_state concept
        pwm: Keep PWM state in sync with hardware state
        ARM: Explicitly apply PWM config extracted from pwm_args
        drm: i915: Explicitly apply PWM config extracted from pwm_args
        input: misc: pwm-beeper: Explicitly apply PWM config extracted from pwm_args
        input: misc: max8997: Explicitly apply PWM config extracted from pwm_args
        backlight: lm3630a: explicitly apply PWM config extracted from pwm_args
        backlight: lp855x: Explicitly apply PWM config extracted from pwm_args
        backlight: lp8788: Explicitly apply PWM config extracted from pwm_args
        backlight: pwm_bl: Use pwm_get_args() where appropriate
        fbdev: ssd1307fb: Use pwm_get_args() where appropriate
        regulator: pwm: Use pwm_get_args() where appropriate
        leds: pwm: Use pwm_get_args() where appropriate
        input: misc: max77693: Use pwm_get_args() where appropriate
        ...
      ecc5fbd5
    • Tom Haynes's avatar
      nfs/flexfiles: Helper function to detect FF_FLAGS_NO_READ_IO · fb1084e3
      Tom Haynes authored
      The mds can inform the client not to use the IOMODE_RW layout
      segment for doing READs. I.e., it is basically a
      IOMODE_WRITE layout segment.
      
      It would do this to not interfere with the WRITEs.
      Signed-off-by: default avatarTom Haynes <loghyr@primarydata.com>
      Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
      fb1084e3
    • Linus Torvalds's avatar
      Merge git://www.linux-watchdog.org/linux-watchdog · 1f93d2ab
      Linus Torvalds authored
      Pull watchdog updates from Wim Van Sebroeck:
      
       - add support for Fintek F81865 Super-IO chip
      
       - add support for watchdogs (RWDT and SWDT) found on RCar Gen3 based
         SoCs from Renesas
      
       - octeon: Handle the FROZEN hot plug notifier actions
      
       - f71808e_wdt fixes and cleanups
      
       - some small improvements in code and documentation
      
      * git://www.linux-watchdog.org/linux-watchdog:
        MAINTAINERS: Add file patterns for watchdog device tree bindings
        Documentation: Add ebc-c384_wdt watchdog-parameters.txt entry
        watchdog: shwdt: Use setup_timer()
        watchdog: cpwd: Use setup_timer()
        arm64: defconfig: enable Renesas Watchdog Timer
        watchdog: renesas-wdt: add driver
        watchdog: remove error message when unable to allocate watchdog device
        watchdog: f71808e_wdt: Fix WDTMOUT_STS register read
        watchdog: f71808e_wdt: Fix typo
        watchdog: f71808e_wdt: Add F81865 support
        watchdog: sp5100_tco: properly check for new register layouts
        watchdog: core: Fix circular locking dependency
        watchdog: core: fix trivial typo in a comment
        watchdog: hpwdt: Adjust documentation to match latest kernel module parameters.
        watchdog: imx2_wdt: add external reset support via dt prop
        watchdog: octeon: Handle the FROZEN hot plug notifier actions.
        watchdog: qcom: Report reboot reason
      1f93d2ab
    • Weston Andros Adamson's avatar
      nfs: avoid race that crashes nfs_init_commit · ade8febd
      Weston Andros Adamson authored
      Since the patch "NFS: Allow multiple commit requests in flight per file"
      we can run multiple simultaneous commits on the same inode.  This
      introduced a race over collecting pages to commit that made it possible
      to call nfs_init_commit() with an empty list - which causes crashes like
      the one below.
      
      The fix is to catch this race and avoid calling nfs_init_commit and
      initiate_commit when there is no work to do.
      
      Here is the crash:
      
      [600522.076832] BUG: unable to handle kernel NULL pointer dereference at 0000000000000040
      [600522.078475] IP: [<ffffffffa0479e72>] nfs_init_commit+0x22/0x130 [nfs]
      [600522.078745] PGD 4272b1067 PUD 4272cb067 PMD 0
      [600522.078972] Oops: 0000 [#1] SMP
      [600522.079204] Modules linked in: nfsv3 nfs_layout_flexfiles rpcsec_gss_krb5 nfsv4 dns_resolver nfs fscache dcdbas ip6t_rpfilter ip6t_REJECT nf_reject_ipv6 xt_conntrack ebtable_nat ebtable_broute bridge stp llc ebtable_filter ebtables ip6table_nat nf_conntrack_ipv6 nf_defrag_ipv6 nf_nat_ipv6 ip6table_mangle ip6table_security ip6table_raw ip6table_filter ip6_tables iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack iptable_mangle iptable_security iptable_raw vmw_vsock_vmci_transport vsock bonding ipmi_devintf ipmi_msghandler coretemp crct10dif_pclmul crc32_pclmul ghash_clmulni_intel ppdev vmw_balloon parport_pc parport acpi_cpufreq vmw_vmci i2c_piix4 shpchp nfsd auth_rpcgss nfs_acl lockd grace sunrpc xfs libcrc32c vmwgfx drm_kms_helper ttm drm crc32c_intel serio_raw vmxnet3
      [600522.081380]  vmw_pvscsi ata_generic pata_acpi
      [600522.081809] CPU: 3 PID: 15667 Comm: /usr/bin/python Not tainted 4.1.9-100.pd.88.el7.x86_64 #1
      [600522.082281] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 09/30/2014
      [600522.082814] task: ffff8800bbbfa780 ti: ffff88042ae84000 task.ti: ffff88042ae84000
      [600522.083378] RIP: 0010:[<ffffffffa0479e72>]  [<ffffffffa0479e72>] nfs_init_commit+0x22/0x130 [nfs]
      [600522.083973] RSP: 0018:ffff88042ae87438  EFLAGS: 00010246
      [600522.084571] RAX: 0000000000000000 RBX: ffff880003485e40 RCX: ffff88042ae87588
      [600522.085188] RDX: 0000000000000000 RSI: ffff88042ae874b0 RDI: ffff880003485e40
      [600522.085756] RBP: ffff88042ae87448 R08: ffff880003486010 R09: ffff88042ae874b0
      [600522.086332] R10: 0000000000000000 R11: 0000000000000005 R12: ffff88042ae872d0
      [600522.086905] R13: ffff88042ae874b0 R14: ffff880003485e40 R15: ffff88042704c840
      [600522.087484] FS:  00007f4728ff2740(0000) GS:ffff88043fd80000(0000) knlGS:0000000000000000
      [600522.088070] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
      [600522.088663] CR2: 0000000000000040 CR3: 000000042b6aa000 CR4: 00000000001406e0
      [600522.089327] Stack:
      [600522.089926]  0000000000000001 ffff88042ae87588 ffff88042ae874f8 ffffffffa04f09fa
      [600522.090549]  0000000000017840 0000000000017840 ffff88042ae87588 ffff8803258d9930
      [600522.091169]  ffff88042ae87578 ffffffffa0563d80 0000000000000000 ffff88042704c840
      [600522.091789] Call Trace:
      [600522.092420]  [<ffffffffa04f09fa>] pnfs_generic_commit_pagelist+0x1da/0x320 [nfsv4]
      [600522.093052]  [<ffffffffa0563d80>] ? ff_layout_commit_prepare_v3+0x30/0x30 [nfs_layout_flexfiles]
      [600522.093696]  [<ffffffffa0562645>] ff_layout_commit_pagelist+0x15/0x20 [nfs_layout_flexfiles]
      [600522.094359]  [<ffffffffa047bc78>] nfs_generic_commit_list+0xe8/0x120 [nfs]
      [600522.095032]  [<ffffffffa047bd6a>] nfs_commit_inode+0xba/0x110 [nfs]
      [600522.095719]  [<ffffffffa046ac54>] nfs_release_page+0x44/0xd0 [nfs]
      [600522.096410]  [<ffffffff811a8122>] try_to_release_page+0x32/0x50
      [600522.097109]  [<ffffffff811bd4f1>] shrink_page_list+0x961/0xb30
      [600522.097812]  [<ffffffff811bdced>] shrink_inactive_list+0x1cd/0x550
      [600522.098530]  [<ffffffff811bea65>] shrink_lruvec+0x635/0x840
      [600522.099250]  [<ffffffff811bed60>] shrink_zone+0xf0/0x2f0
      [600522.099974]  [<ffffffff811bf312>] do_try_to_free_pages+0x192/0x470
      [600522.100709]  [<ffffffff811bf6ca>] try_to_free_pages+0xda/0x170
      [600522.101464]  [<ffffffff811b2198>] __alloc_pages_nodemask+0x588/0x970
      [600522.102235]  [<ffffffff811fbbd5>] alloc_pages_vma+0xb5/0x230
      [600522.103000]  [<ffffffff813a1589>] ? cpumask_any_but+0x39/0x50
      [600522.103774]  [<ffffffff811d6115>] wp_page_copy.isra.55+0x95/0x490
      [600522.104558]  [<ffffffff810e3438>] ? __wake_up+0x48/0x60
      [600522.105357]  [<ffffffff811d7d3b>] do_wp_page+0xab/0x4f0
      [600522.106137]  [<ffffffff810a1bbb>] ? release_task+0x36b/0x470
      [600522.106902]  [<ffffffff8126dbd7>] ? eventfd_ctx_read+0x67/0x1c0
      [600522.107659]  [<ffffffff811da2a8>] handle_mm_fault+0xc78/0x1900
      [600522.108431]  [<ffffffff81067ef1>] __do_page_fault+0x181/0x420
      [600522.109173]  [<ffffffff811446a6>] ? __audit_syscall_exit+0x1e6/0x280
      [600522.109893]  [<ffffffff810681c0>] do_page_fault+0x30/0x80
      [600522.110594]  [<ffffffff81024f36>] ? syscall_trace_leave+0xc6/0x120
      [600522.111288]  [<ffffffff81790a58>] page_fault+0x28/0x30
      [600522.111947] Code: 5d c3 0f 1f 80 00 00 00 00 0f 1f 44 00 00 55 4c 8d 87 d0 01 00 00 48 89 e5 53 48 89 fb 48 83 ec 08 4c 8b 0e 49 8b 41 18 4c 39 ce <48> 8b 40 40 4c 8b 50 30 74 24 48 8b 87 d0 01 00 00 48 8b 7e 08
      [600522.113343] RIP  [<ffffffffa0479e72>] nfs_init_commit+0x22/0x130 [nfs]
      [600522.114003]  RSP <ffff88042ae87438>
      [600522.114636] CR2: 0000000000000040
      
      Fixes: af7cf057 (NFS: Allow multiple commit requests in flight per file)
      CC: stable@vger.kernel.org
      Signed-off-by: default avatarWeston Andros Adamson <dros@primarydata.com>
      Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
      ade8febd
    • Linus Torvalds's avatar
      Merge tag 'vfio-v4.7-rc1' of git://github.com/awilliam/linux-vfio · 48dd7cef
      Linus Torvalds authored
      Pull VFIO updates from Alex Williamson:
      
       - Hide INTx on certain known broken devices (Alex Williamson)
      
       - Additional backdoor reset detection (Alex Williamson)
      
       - Remove unused iommudata reference (Alexey Kardashevskiy)
      
       - Use cfg_size to avoid probing extended config space (Alexey
         Kardashevskiy)
      
      * tag 'vfio-v4.7-rc1' of git://github.com/awilliam/linux-vfio:
        vfio_pci: Test for extended capabilities if config space > 256 bytes
        vfio_iommu_spapr_tce: Remove unneeded iommu_group_get_iommudata
        vfio/pci: Add test for BAR restore
        vfio/pci: Hide broken INTx support from user
      48dd7cef
    • Linus Torvalds's avatar
      Merge tag 'drm-4.7-rc1-headers-fix' of git://people.freedesktop.org/~airlied/linux · b462b37b
      Linus Torvalds authored
      Pull header warning fix from Dave Airlie:
       "Here is the C++ guards warning fix from Arnd"
      
      [ Background: there are 'extern "C" { }' guards in include/uapi for the
        GPU headers.
      
        They should arguably be wrapped somehow, but as it is they caused
        checkpatch to warn because it would trigger on the 'extern' and think
        it's exporting a function or variable from the kernel to user space.
      
        This just fixes checkpatch.  Whether we wrap the C++ guards some way
        in the future will be an independent issue. ]
      
      * tag 'drm-4.7-rc1-headers-fix' of git://people.freedesktop.org/~airlied/linux:
        headers_check: don't warn about c++ guards
      b462b37b
    • Linus Torvalds's avatar
      Merge branch 'parisc-4.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux · 24c82fbb
      Linus Torvalds authored
      Pull parisc updates from Helge Deller:
      
       - Add native high-resolution timing code for sched_clock() and other
         timing functions based on the processor internal cr16 cycle counters
      
       - Add syscall tracepoint support
      
       - Add regset support
      
       - Speed up get_user() and put_user() functions
      
       - Updated futex.h to match generic implementation (John David Anglin)
      
       - A few smaller ftrace build fixes
      
       - Fixed thuge-gen kernel self test to utilize architectured MAP_HUGETLB
         value
      
       - Added parisc architecture to seccomp_bpf kernel self test
      
       - Various typo fixes (Andrea Gelmini)
      
      * 'parisc-4.7-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux:
        parisc: Whitespace cleanups in unistd.h
        parisc: Use long jump to reach ftrace_return_to_handler()
        parisc: Fix typo in fpudispatch.c
        parisc: Fix typos in eisa_eeprom.h
        parisc: Fix typo in ldcw.h
        parisc: Fix typo in pdc.h
        parisc: Update futex.h to match generic implementation
        parisc: Merge ftrace C-helper and assembler functions into .text.hot section
        selftests/thuge-gen: Use platform specific MAP_HUGETLB value
        parisc: Add native high-resolution sched_clock() implementation
        parisc: Add ARCH_TRACEHOOK and regset support
        parisc: Add 64bit get_user() and put_user() for 32bit kernel
        parisc: Simplify and speed up get_user() and put_user()
        parisc: Add syscall tracepoint support
      24c82fbb
    • Dan Carpenter's avatar
      NFS: checking for NULL instead of IS_ERR() in nfs_commit_file() · 2997bfd0
      Dan Carpenter authored
      nfs_create_request() doesn't return NULL, it returns error pointers.
      
      Fixes: 67911c8f ('NFS: Add nfs_commit_file()')
      Signed-off-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
      Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
      2997bfd0
    • Helge Deller's avatar
      parisc: Whitespace cleanups in unistd.h · 784c2213
      Helge Deller authored
      Clean up whitespaces and mark unused syscalls as such.
      Signed-off-by: default avatarHelge Deller <deller@gmx.de>
      784c2213
    • Peter Zijlstra's avatar
      sched/core: Fix remote wakeups · b7e7ade3
      Peter Zijlstra authored
      Commit:
      
        b5179ac7 ("sched/fair: Prepare to fix fairness problems on migration")
      
      ... introduced a bug: Mike Galbraith found that it introduced a
      performance regression, while Paul E. McKenney reported lost
      wakeups and bisected it to this commit.
      
      The reason is that I mis-read ttwu_queue() such that I assumed any
      wakeup that got a remote queue must have had the task migrated.
      
      Since this is not so; we need to transfer this information between
      queueing the wakeup and actually doing the wakeup. Use a new
      task_struct::sched_flag for this, we already write to
      sched_contributes_to_load in the wakeup path so this is a hot and
      modified cacheline.
      Reported-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Reported-by: default avatarMike Galbraith <umgwanakikbuti@gmail.com>
      Tested-by: default avatarMike Galbraith <umgwanakikbuti@gmail.com>
      Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
      Cc: Andrew Hunter <ahh@google.com>
      Cc: Andy Lutomirski <luto@amacapital.net>
      Cc: Ben Segall <bsegall@google.com>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Dave Hansen <dave.hansen@linux.intel.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: Fenghua Yu <fenghua.yu@intel.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Matt Fleming <matt@codeblueprint.co.uk>
      Cc: Morten Rasmussen <morten.rasmussen@arm.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Paul Turner <pjt@google.com>
      Cc: Pavan Kondeti <pkondeti@codeaurora.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: byungchul.park@lge.com
      Fixes: b5179ac7 ("sched/fair: Prepare to fix fairness problems on migration")
      Link: http://lkml.kernel.org/r/20160523091907.GD15728@worktop.ger.corp.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
      b7e7ade3