1. 03 Apr, 2015 8 commits
    • Lukas Czerner's avatar
      ext4: make fsync to sync parent dir in no-journal for real this time · e12fb972
      Lukas Czerner authored
      Previously commit 14ece102 added a
      support for for syncing parent directory of newly created inodes to
      make sure that the inode is not lost after a power failure in
      no-journal mode.
      
      However this does not work in majority of cases, namely:
       - if the directory has inline data
       - if the directory is already indexed
       - if the directory already has at least one block and:
      	- the new entry fits into it
      	- or we've successfully converted it to indexed
      
      So in those cases we might lose the inode entirely even after fsync in
      the no-journal mode. This also includes ext2 default mode obviously.
      
      I've noticed this while running xfstest generic/321 and even though the
      test should fail (we need to run fsck after a crash in no-journal mode)
      I could not find a newly created entries even when if it was fsynced
      before.
      
      Fix this by adjusting the ext4_add_entry() successful exit paths to set
      the inode EXT4_STATE_NEWENTRY so that fsync has the chance to fsync the
      parent directory as well.
      Signed-off-by: default avatarLukas Czerner <lczerner@redhat.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      Cc: Frank Mayhar <fmayhar@google.com>
      Cc: stable@vger.kernel.org
      e12fb972
    • Eric Whitney's avatar
      ext4: don't release reserved space for previously allocated cluster · 9d21c9fa
      Eric Whitney authored
      When xfstests' auto group is run on a bigalloc filesystem with a
      4.0-rc3 kernel, e2fsck failures and kernel warnings occur for some
      tests. e2fsck reports incorrect iblocks values, and the warnings
      indicate that the space reserved for delayed allocation is being
      overdrawn at allocation time.
      
      Some of these errors occur because the reserved space is incorrectly
      decreased by one cluster when ext4_ext_map_blocks satisfies an
      allocation request by mapping an unused portion of a previously
      allocated cluster.  Because a cluster's worth of reserved space was
      already released when it was first allocated, it should not be released
      again.
      
      This patch appears to correct the e2fsck failure reported for
      generic/232 and the kernel warnings produced by ext4/001, generic/009,
      and generic/033.  Failures and warnings for some other tests remain to
      be addressed.
      Signed-off-by: default avatarEric Whitney <enwlinux@gmail.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      9d21c9fa
    • Eric Whitney's avatar
      ext4: fix loss of delalloc extent info in ext4_zero_range() · 94426f4b
      Eric Whitney authored
      In ext4_zero_range(), removing a file's entire block range from the
      extent status tree removes all records of that file's delalloc extents.
      The delalloc accounting code uses this information, and its loss can
      then lead to accounting errors and kernel warnings at writeback time and
      subsequent file system damage.  This is most noticeable on bigalloc
      file systems where code in ext4_ext_map_blocks() handles cases where
      delalloc extents share clusters with a newly allocated extent.
      
      Because we're not deleting a block range and are correctly updating the
      status of its associated extent, there is no need to remove anything
      from the extent status tree.
      
      When this patch is combined with an unrelated bug fix for
      ext4_zero_range(), kernel warnings and e2fsck errors reported during
      xfstests runs on bigalloc filesystems are greatly reduced without
      introducing regressions on other xfstests-bld test scenarios.
      Signed-off-by: default avatarEric Whitney <enwlinux@gmail.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      94426f4b
    • Lukas Czerner's avatar
      ext4: allocate entire range in zero range · 0f2af21a
      Lukas Czerner authored
      Currently there is a bug in zero range code which causes zero range
      calls to only allocate block aligned portion of the range, while
      ignoring the rest in some cases.
      
      In some cases, namely if the end of the range is past i_size, we do
      attempt to preallocate the last nonaligned block. However this might
      cause kernel to BUG() in some carefully designed zero range requests
      on setups where page size > block size.
      
      Fix this problem by first preallocating the entire range, including
      the nonaligned edges and converting the written extents to unwritten
      in the next step. This approach will also give us the advantage of
      having the range to be as linearly contiguous as possible.
      Signed-off-by: default avatarLukas Czerner <lczerner@redhat.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      0f2af21a
    • Maurizio Lombardi's avatar
      5a4f3145
    • Christoph Hellwig's avatar
      ext4: remove block_device_ejected · 08439fec
      Christoph Hellwig authored
      bdi->dev now never goes away, so this function became useless.
      Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      08439fec
    • Wei Yuan's avatar
      ext4: remove useless condition in if statement. · 5f80f62a
      Wei Yuan authored
      In this if statement, the previous condition is useless, the later one
      has covered it.
      Signed-off-by: default avatarWeiyuan <weiyuan.wei@huawei.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Reviewed-by: default avatarLukas Czerner <lczerner@redhat.com>
      5f80f62a
    • Sheng Yong's avatar
      ext4: remove unused header files · 72b8e0f9
      Sheng Yong authored
      Remove unused header files and header files which are included in
      ext4.h.
      Signed-off-by: default avatarSheng Yong <shengyong1@huawei.com>
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      72b8e0f9
  2. 02 Apr, 2015 3 commits
  3. 17 Mar, 2015 2 commits
    • Theodore Ts'o's avatar
      fs: add dirtytime_expire_seconds sysctl · 1efff914
      Theodore Ts'o authored
      Add a tuning knob so we can adjust the dirtytime expiration timeout,
      which is very useful for testing lazytime.
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      1efff914
    • Theodore Ts'o's avatar
      fs: make sure the timestamps for lazytime inodes eventually get written · a2f48706
      Theodore Ts'o authored
      Jan Kara pointed out that if there is an inode which is constantly
      getting dirtied with I_DIRTY_PAGES, an inode with an updated timestamp
      will never be written since inode->dirtied_when is constantly getting
      updated.  We fix this by adding an extra field to the inode,
      dirtied_time_when, so inodes with a stale dirtytime can get detected
      and handled.
      
      In addition, if we have a dirtytime inode caused by an atime update,
      and there is no write activity on the file system, we need to have a
      secondary system to make sure these inodes get written out.  We do
      this by setting up a second delayed work structure which wakes up the
      CPU much more rarely compared to writeback_expire_centisecs.
      Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
      Reviewed-by: default avatarJan Kara <jack@suse.cz>
      a2f48706
  4. 03 Mar, 2015 2 commits
    • Linus Torvalds's avatar
      Linux 4.0-rc2 · 13a7a6ac
      Linus Torvalds authored
      13a7a6ac
    • Daniel Vetter's avatar
      drm/i915: Fix modeset state confusion in the load detect code · 9128b040
      Daniel Vetter authored
      This is a tricky story of the new atomic state handling and the legacy
      code fighting over each another. The bug at hand is an underrun of the
      framebuffer reference with subsequent hilarity caused by the load
      detect code. Which is peculiar since the the exact same code works
      fine as the implementation of the legacy setcrtc ioctl.
      
      Let's look at the ingredients:
      
      - Currently our code is a crazy mix of legacy modeset interfaces to
        set the parameters and half-baked atomic state tracking underneath.
        While this transition is going we're using the transitional plane
        helpers to update the atomic side (drm_plane_helper_disable/update
        and friends), i.e. plane->state->fb. Since the state structure owns
        the fb those functions take care of that themselves.
      
        The legacy state (specifically crtc->primary->fb) is still managed
        by the old code (and mostly by the drm core), with the fb reference
        counting done by callers (core drm for the ioctl or the i915 load
        detect code). The relevant commit is
      
        commit ea2c67bb
        Author: Matt Roper <matthew.d.roper@intel.com>
        Date:   Tue Dec 23 10:41:52 2014 -0800
      
            drm/i915: Move to atomic plane helpers (v9)
      
      - drm_plane_helper_disable has special code to handle multiple calls
        in a row - it checks plane->crtc == NULL and bails out. This is to
        match the proper atomic implementation which needs the crtc to get
        at the implied locking context atomic updates always need. See
      
        commit acf24a39
        Author: Daniel Vetter <daniel.vetter@ffwll.ch>
        Date:   Tue Jul 29 15:33:05 2014 +0200
      
            drm/plane-helper: transitional atomic plane helpers
      
      - The universal plane code split out the implicit primary plane from
        the CRTC into it's own full-blown drm_plane object. As part of that
        the setcrtc ioctl (which updated both the crtc mode and primary
        plane) learned to set crtc->primary->crtc on modeset to make sure
        the plane->crtc assignments statate up to date in
      
        commit e13161af
        Author: Matt Roper <matthew.d.roper@intel.com>
        Date:   Tue Apr 1 15:22:38 2014 -0700
      
            drm: Add drm_crtc_init_with_planes() (v2)
      
        Unfortunately we've forgotten to update the load detect code. Which
        wasn't a problem since the load detect modeset is temporary and
        always undone before we drop the locks.
      
      - Finally there is a organically grown history (i.e. don't ask) around
        who sets the legacy plane->fb for the various driver entry points.
        Originally updating that was the drivers duty, but for almost all
        places we've moved that (plus updating the refcounts) into the core.
        Again the exception is the load detect code.
      
      Taking all together the following happens:
      - The load detect code doesn't set crtc->primary->crtc. This is only
        really an issue on crtcs never before used or when userspace
        explicitly disabled the primary plane.
      
      - The plane helper glue code short-circuits because of that and leaves
        a non-NULL fb behind in plane->state->fb and plane->fb. The state
        fb isn't a real problem (it's properly refcounted on its own), it's
        just the canary.
      
      - Load detect code drops the reference for that fb, but doesn't set
        plane->fb = NULL. This is ok since it's still living in that old
        world where drivers had to clear the pointer but the core/callers
        handled the refcounting.
      
      - On the next modeset the drm core notices plane->fb and takes care of
        refcounting it properly by doing another unref. This drops the
        refcount to zero, leaving state->plane now pointing at freed memory.
      
      - intel_plane_duplicate_state still assume it owns a reference to that
        very state->fb and bad things start to happen.
      
      Fix this all by applying the same duct-tape as for the legacy setcrtc
      ioctl code and set crtc->primary->crtc properly.
      
      Cc: Matt Roper <matthew.d.roper@intel.com>
      Cc: Paul Bolle <pebolle@tiscali.nl>
      Cc: Rob Clark <robdclark@gmail.com>
      Cc: Paulo Zanoni <przanoni@gmail.com>
      Cc: Sean Paul <seanpaul@chromium.org>
      Cc: Matt Roper <matthew.d.roper@intel.com>
      Reported-and-tested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      Reported-by: default avatarPaul Bolle <pebolle@tiscali.nl>
      Signed-off-by: default avatarDaniel Vetter <daniel.vetter@intel.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9128b040
  5. 02 Mar, 2015 4 commits
    • Linus Torvalds's avatar
      Merge tag 'gpio-v4.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio · 023a6007
      Linus Torvalds authored
      Pull GPIO fixes from Linus Walleij:
       "Two GPIO fixes:
      
         - Fix a translation problem in of_get_named_gpiod_flags()
      
         - Fix a long standing container_of() mistake in the TPS65912 driver"
      
      * tag 'gpio-v4.0-2' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio:
        gpio: tps65912: fix wrong container_of arguments
        gpiolib: of: allow of_gpiochip_find_and_xlate to find more than one chip per node
      023a6007
    • Linus Torvalds's avatar
      Merge branch 'fixes-for-4.0-rc2' of... · 10d6dfc1
      Linus Torvalds authored
      Merge branch 'fixes-for-4.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal
      
      Pull thermal management fixes from Eduardo Valentin:
       "Specifics:
      
         - Several fixes in tmon tool.
      
         - Fixes in intel int340x for _ART and _TRT tables.
      
         - Add id for Avoton SoC into powerclamp driver.
      
         - Fixes in RCAR thermal driver to remove race conditions and fix fail
           path
      
         - Fixes in TI thermal driver: removal of unnecessary code and build
           fix if !CONFIG_PM_SLEEP
      
         - Cleanups in exynos thermal driver
      
         - Add stubs for include/linux/thermal.h.  Now drivers using thermal
           calls but that also work without CONFIG_THERMAL will be able to
           compile for systems that don't care about thermal.
      
        Note: I am sending this pull on Rui's behalf while he fixes issues in
        his Linux box"
      
      * 'fixes-for-4.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/evalenti/linux-soc-thermal:
        thermal: int340x_thermal: Ignore missing _ART, _TRT tables
        thermal/intel_powerclamp: add id for Avoton SoC
        tools/thermal: tmon: silence 'set but not used' warnings
        tools/thermal: tmon: use pkg-config to determine library dependencies
        tools/thermal: tmon: support cross-compiling
        tools/thermal: tmon: add .gitignore
        tools/thermal: tmon: fixup tui windowing calculations
        tools/thermal: tmon: tui: don't hard-code dialog window size assumptions
        tools/thermal: tmon: add min/max macros
        tools/thermal: tmon: add --target-temp parameter
        thermal: exynos: Clean-up code to use oneline entry for exynos compatible table
        thermal: rcar: Make error and remove paths symmetrical with init
        thermal: rcar: Fix race condition between init and interrupt
        thermal: Introduce dummy functions when thermal is not defined
        ti-soc-thermal: Delete an unnecessary check before the function call "cpufreq_cooling_unregister"
        thermal: ti-soc-thermal: bandgap: Fix build warning if !CONFIG_PM_SLEEP
      10d6dfc1
    • Linus Torvalds's avatar
      Merge tag 'md/4.0-fixes' of git://neil.brown.name/md · 1a6f77ab
      Linus Torvalds authored
      Pull md fixes from Neil Brown:
       "Three md fixes:
      
         - fix a read-balance problem that was reported 2 years ago, but that
           I never noticed the report :-(
      
         - fix for rare RAID6 problem causing incorrect bitmap updates when
           two devices fail.
      
         - add __ATTR_PREALLOC annotation now that it is possible"
      
      * tag 'md/4.0-fixes' of git://neil.brown.name/md:
        md: mark some attributes as pre-alloc
        raid5: check faulty flag for array status during recovery.
        md/raid1: fix read balance when a drive is write-mostly.
      1a6f77ab
    • Linus Torvalds's avatar
      Merge tag 'metag-fixes-v4.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag · 49db1f0e
      Linus Torvalds authored
      Pull arch/metag fix from James Hogan:
       "This is just a single patch to fix the KSTK_EIP() and KSTK_ESP()
        macros for metag which have always been erronously returning the PC
        and stack pointer of the task's kernel context rather than from its
        user context saved at entry from userland into the kernel, which
        affects the contents of /proc/<pid>/maps and /proc/<pid>/stat"
      
      * tag 'metag-fixes-v4.0-1' of git://git.kernel.org/pub/scm/linux/kernel/git/jhogan/metag:
        metag: Fix KSTK_EIP() and KSTK_ESP() macros
      49db1f0e
  6. 01 Mar, 2015 6 commits
  7. 28 Feb, 2015 15 commits
    • Linus Torvalds's avatar
      Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux · ae1aa797
      Linus Torvalds authored
      Pull drm fixes from Dave Airlie:
       "Just general fixes: radeon, i915, atmel, tegra, amdkfd and one core
        fix"
      
      * 'drm-fixes' of git://people.freedesktop.org/~airlied/linux: (28 commits)
        drm: atmel-hlcdc: remove clock polarity from crtc driver
        drm/radeon: only enable DP audio if the monitor supports it
        drm/radeon: fix atom aux payload size check for writes (v2)
        drm/radeon: fix 1 RB harvest config setup for TN/RL
        drm/radeon: enable SRBM timeout interrupt on EG/NI
        drm/radeon: enable SRBM timeout interrupt on SI
        drm/radeon: enable SRBM timeout interrupt on CIK v2
        drm/radeon: dump full IB if we hit a packet error
        drm/radeon: disable mclk switching with 120hz+ monitors
        drm/radeon: use drm_mode_vrefresh() rather than mode->vrefresh
        drm/radeon: enable native backlight control on old macs
        drm/i915: Fix frontbuffer false positve.
        drm/i915: Align initial plane backing objects correctly
        drm/i915: avoid processing spurious/shared interrupts in low-power states
        drm/i915: Check obj->vma_list under the struct_mutex
        drm/i915: Fix a use after free, and unbalanced refcounting
        drm: atmel-hlcdc: remove useless pm_runtime_put_sync in probe
        drm: atmel-hlcdc: reset layer A2Q and UPDATE bits when disabling it
        drm: Fix deadlock due to getconnector locking changes
        drm/i915: Dell Chromebook 11 has PWM backlight
        ...
      ae1aa797
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.dk/linux-block · a015d33c
      Linus Torvalds authored
      Pull block layer fixes from Jens Axboe:
       "Two smaller fixes for this cycle:
      
         - A fixup from Keith so that NVMe compiles without BLK_INTEGRITY,
           basically just moving the code around appropriately.
      
         - A fixup for shm, fixing an oops in shmem_mapping() for mapping with
           no inode.  From Sasha"
      
      [ The shmem fix doesn't look block-layer-related, but fixes a bug that
        happened due to the backing_dev_info removal..  - Linus ]
      
      * 'for-linus' of git://git.kernel.dk/linux-block:
        mm: shmem: check for mapping owner before dereferencing
        NVMe: Fix for BLK_DEV_INTEGRITY not set
      a015d33c
    • Linus Torvalds's avatar
      Merge tag 'xfs-for-linus-4.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs · 2aaeb784
      Linus Torvalds authored
      Pull xfs fixes from Dave Chinner:
       "These are fixes for regressions/bugs introduced in the 4.0 merge cycle
        and problems discovered during the merge window that need to be pushed
        back to stable kernels ASAP.
      
        This contains:
         - ensure quota type is reset in on-disk dquots
         - fix missing partial EOF block data flush on truncate extension
         - fix transaction leak in error handling for new pnfs block layout
           support
         - add missing target_ip check to RENAME_EXCHANGE"
      
      * tag 'xfs-for-linus-4.0-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs:
        xfs: cancel failed transaction in xfs_fs_commit_blocks()
        xfs: Ensure we have target_ip for RENAME_EXCHANGE
        xfs: ensure truncate forces zeroed blocks to disk
        xfs: Fix quota type in quota structures when reusing quota file
      2aaeb784
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · e9738946
      Linus Torvalds authored
      Merge misc fixes from Andrew Morton:
       "13 fixes"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>:
        mm: add missing __PAGETABLE_{PUD,PMD}_FOLDED defines
        mm: page_alloc: revert inadvertent !__GFP_FS retry behavior change
        kernel/sys.c: fix UNAME26 for 4.0
        mm: memcontrol: use "max" instead of "infinity" in control knobs
        zram: use proper type to update max_used_pages
        drivers/rtc/rtc-ds1685.c: fix conditional in ds1685_rtc_sysfs_time_regs_{show,store}
        nilfs2: fix potential memory overrun on inode
        scripts/gdb: add empty package initialization script
        rtc: ds1685: remove superfluous checks for out-of-range u8 values
        rtc: ds1685: fix ds1685_rtc_alarm_irq_enable build error
        memcg: fix low limit calculation
        mm/nommu: fix memory leak
        ocfs2: update web page + git tree in documentation
      e9738946
    • Kirill A. Shutemov's avatar
      mm: add missing __PAGETABLE_{PUD,PMD}_FOLDED defines · c07af4f1
      Kirill A. Shutemov authored
      Core mm expects __PAGETABLE_{PUD,PMD}_FOLDED to be defined if these page
      table levels folded.  Usually, these defines are provided by
      <asm-generic/pgtable-nopmd.h> and <asm-generic/pgtable-nopud.h>.
      
      But some architectures fold page table levels in a custom way.  They
      need to define these macros themself.  This patch adds missing defines.
      
      The patch fixes mm->nr_pmds underflow and eliminates dead __pmd_alloc()
      and __pud_alloc() on architectures without these page table levels.
      Signed-off-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
      Cc: David Howells <dhowells@redhat.com>
      Cc: Geert Uytterhoeven <geert@linux-m68k.org>
      Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
      Cc: Helge Deller <deller@gmx.de>
      Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
      Cc: Koichi Yasutake <yasutake.koichi@jp.panasonic.com>
      Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c07af4f1
    • Johannes Weiner's avatar
      mm: page_alloc: revert inadvertent !__GFP_FS retry behavior change · cc873177
      Johannes Weiner authored
      Historically, !__GFP_FS allocations were not allowed to invoke the OOM
      killer once reclaim had failed, but nevertheless kept looping in the
      allocator.
      
      Commit 9879de73 ("mm: page_alloc: embed OOM killing naturally into
      allocation slowpath"), which should have been a simple cleanup patch,
      accidentally changed the behavior to aborting the allocation at that
      point.  This creates problems with filesystem callers (?) that currently
      rely on the allocator waiting for other tasks to intervene.
      
      Revert the behavior as it shouldn't have been changed as part of a
      cleanup patch.
      
      Fixes: 9879de73 ("mm: page_alloc: embed OOM killing naturally into allocation slowpath")
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Reported-by: default avatarTetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
      Cc: Theodore Ts'o <tytso@mit.edu>
      Cc: Dave Chinner <david@fromorbit.com>
      Acked-by: default avatarDavid Rientjes <rientjes@google.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: <stable@vger.kernel.org>	[3.19.x]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      cc873177
    • Jon DeVree's avatar
      kernel/sys.c: fix UNAME26 for 4.0 · 39afb5ee
      Jon DeVree authored
      There's a uname workaround for broken userspace which can't handle kernel
      versions of 3.x.  Update it for 4.x.
      Signed-off-by: default avatarJon DeVree <nuxi@vault24.org>
      Cc: Andi Kleen <andi@firstfloor.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      39afb5ee
    • Johannes Weiner's avatar
      mm: memcontrol: use "max" instead of "infinity" in control knobs · d2973697
      Johannes Weiner authored
      The memcg control knobs indicate the highest possible value using the
      symbolic name "infinity", which is long and awkward to type.
      
      Switch to the string "max", which is just as descriptive but shorter and
      sweeter.
      
      This changes a user interface, so do it before the release and before
      the development flag is dropped from the default hierarchy.
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Cc: Michal Hocko <mhocko@suse.cz>
      Cc: Tejun Heo <tj@kernel.org>
      Cc: Vladimir Davydov <vdavydov@parallels.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d2973697
    • Joonsoo Kim's avatar
      zram: use proper type to update max_used_pages · 2ea55a2c
      Joonsoo Kim authored
      max_used_pages is defined as atomic_long_t so we need to use unsigned
      long to keep temporary value for it rather than int which is smaller
      than unsigned long in a 64 bit system.
      Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Jerome Marchand <jmarchan@redhat.com>
      Cc: Nitin Gupta <ngupta@vflare.org>
      Cc: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      2ea55a2c
    • Joshua Kinard's avatar
      drivers/rtc/rtc-ds1685.c: fix conditional in ds1685_rtc_sysfs_time_regs_{show,store} · b00eeaed
      Joshua Kinard authored
      Fix a conditional statement checking for NULL in both
      ds1685_rtc_sysfs_time_regs_show and ds1685_rtc_sysfs_time_regs_store
      that was using a logical AND when it should be using a logical OR so
      that we fail out of the function properly if the condition ever
      evaluates to true.
      
      Fixes: aaaf5fbf ("rtc: add driver for DS1685 family of real time clocks")
      Signed-off-by: default avatarJoshua Kinard <kumba@gentoo.org>
      Reported-by: default avatarDan Carpenter <dan.carpenter@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      b00eeaed
    • Ryusuke Konishi's avatar
      nilfs2: fix potential memory overrun on inode · 957ed60b
      Ryusuke Konishi authored
      Each inode of nilfs2 stores a root node of a b-tree, and it turned out to
      have a memory overrun issue:
      
      Each b-tree node of nilfs2 stores a set of key-value pairs and the number
      of them (in "bn_nchildren" member of nilfs_btree_node struct), as well as
      a few other "bn_*" members.
      
      Since the value of "bn_nchildren" is used for operations on the key-values
      within the b-tree node, it can cause memory access overrun if a large
      number is incorrectly set to "bn_nchildren".
      
      For instance, nilfs_btree_node_lookup() function determines the range of
      binary search with it, and too large "bn_nchildren" leads
      nilfs_btree_node_get_key() in that function to overrun.
      
      As for intermediate b-tree nodes, this is prevented by a sanity check
      performed when each node is read from a drive, however, no sanity check
      has been done for root nodes stored in inodes.
      
      This patch fixes the issue by adding missing sanity check against b-tree
      root nodes so that it's called when on-memory inodes are read from ifile,
      inode metadata file.
      Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
      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>
      957ed60b
    • Jan Kiszka's avatar
      scripts/gdb: add empty package initialization script · 586a1a12
      Jan Kiszka authored
      This got lost during the initial merge process: Python requires an
      __init__.py script, even if empty, in order to accept a directory as
      package.  Add it, this time as a non-empty file.
      Signed-off-by: default avatarJan Kiszka <jan.kiszka@siemens.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      586a1a12
    • Geert Uytterhoeven's avatar
      rtc: ds1685: remove superfluous checks for out-of-range u8 values · 39ea34cc
      Geert Uytterhoeven authored
      drivers/rtc/rtc-ds1685.c: In function `ds1685_rtc_read_alarm':
      drivers/rtc/rtc-ds1685.c:402: warning: comparison is always true due to limited range of data type
      drivers/rtc/rtc-ds1685.c:409: warning: comparison is always true due to limited range of data type
      drivers/rtc/rtc-ds1685.c:416: warning: comparison is always true due to limited range of data type
      drivers/rtc/rtc-ds1685.c: In function `ds1685_rtc_set_alarm':
      drivers/rtc/rtc-ds1685.c:475: warning: comparison is always true due to limited range of data type
      drivers/rtc/rtc-ds1685.c:478: warning: comparison is always true due to limited range of data type
      drivers/rtc/rtc-ds1685.c:481: warning: comparison is always true due to limited range of data type
      
      u8 cannot contain a value larger than 0xff, hence drop the checks.
      Wrapping the checks in unlikely() indicated some sense of humor, though ;-)
      Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
      Acked-by: default avatarJoshua Kinard <kumba@gentoo.org>
      Cc: Alessandro Zummo <a.zummo@towertech.it>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      39ea34cc
    • Arnd Bergmann's avatar
      rtc: ds1685: fix ds1685_rtc_alarm_irq_enable build error · 682354d4
      Arnd Bergmann authored
      The newly added ds1685 driver causes a build error when enabled without
      CONFIG_RTC_INTF_DEV:
      
        drivers/rtc/rtc-ds1685.c:919:22: error: 'ds1685_rtc_alarm_irq_enable' undeclared here (not in a function)
          .alarm_irq_enable = ds1685_rtc_alarm_irq_enable,
      
      Apparently the driver was incorrectly changed to reflect the interface
      change from 16380c15 ("RTC: Convert rtc drivers to use the
      alarm_irq_enable method"), which removed the respective #ifdef from all
      other rtc drivers.
      
      This does the same change that was merged for the other drivers before and
      removes the #ifdef, allowing the interrupts to be enabled through the
      in-kernel rtc interface independent of the existence of /dev/rtc.
      
      Fixes: aaaf5fbf ("rtc: add driver for DS1685 family of real time clocks")
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Acked-by: default avatarJoshua Kinard <kumba@gentoo.org>
      Cc: Ralf Baechle <ralf@linux-mips.org>
      Cc: Alessandro Zummo <a.zummo@towertech.it>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      682354d4
    • Michal Hocko's avatar
      memcg: fix low limit calculation · 4e54dede
      Michal Hocko authored
      A memcg is considered low limited even when the current usage is equal to
      the low limit.  This leads to interesting side effects e.g.
      groups/hierarchies with no memory accounted are considered protected and
      so the reclaim will emit MEMCG_LOW event when encountering them.
      
      Another and much bigger issue was reported by Joonsoo Kim.  He has hit a
      NULL ptr dereference with the legacy cgroup API which even doesn't have
      low limit exposed.  The limit is 0 by default but the initial check fails
      for memcg with 0 consumption and parent_mem_cgroup() would return NULL if
      use_hierarchy is 0 and so page_counter_read would try to dereference NULL.
      
      I suppose that the current implementation is just an overlook because the
      documentation in Documentation/cgroups/unified-hierarchy.txt says:
      
        "The memory.low boundary on the other hand is a top-down allocated
        reserve.  A cgroup enjoys reclaim protection when it and all its
        ancestors are below their low boundaries"
      
      Fix the usage and the low limit comparision in mem_cgroup_low accordingly.
      
      Fixes: 241994ed (mm: memcontrol: default hierarchy interface for memory)
      Reported-by: default avatarJoonsoo Kim <js1304@gmail.com>
      Signed-off-by: default avatarMichal Hocko <mhocko@suse.cz>
      Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4e54dede