1. 30 Oct, 2014 5 commits
    • Eric Rannaud's avatar
      fs: allow open(dir, O_TMPFILE|..., 0) with mode 0 · 69a91c23
      Eric Rannaud authored
      The man page for open(2) indicates that when O_CREAT is specified, the
      'mode' argument applies only to future accesses to the file:
      
      	Note that this mode applies only to future accesses of the newly
      	created file; the open() call that creates a read-only file
      	may well return a read/write file descriptor.
      
      The man page for open(2) implies that 'mode' is treated identically by
      O_CREAT and O_TMPFILE.
      
      O_TMPFILE, however, behaves differently:
      
      	int fd = open("/tmp", O_TMPFILE | O_RDWR, 0);
      	assert(fd == -1);
      	assert(errno == EACCES);
      
      	int fd = open("/tmp", O_TMPFILE | O_RDWR, 0600);
      	assert(fd > 0);
      
      For O_CREAT, do_last() sets acc_mode to MAY_OPEN only:
      
      	if (*opened & FILE_CREATED) {
      		/* Don't check for write permission, don't truncate */
      		open_flag &= ~O_TRUNC;
      		will_truncate = false;
      		acc_mode = MAY_OPEN;
      		path_to_nameidata(path, nd);
      		goto finish_open_created;
      	}
      
      But for O_TMPFILE, do_tmpfile() passes the full op->acc_mode to
      may_open().
      
      This patch lines up the behavior of O_TMPFILE with O_CREAT. After the
      inode is created, may_open() is called with acc_mode = MAY_OPEN, in
      do_tmpfile().
      
      A different, but related glibc bug revealed the discrepancy:
      https://sourceware.org/bugzilla/show_bug.cgi?id=17523
      
      The glibc lazily loads the 'mode' argument of open() and openat() using
      va_arg() only if O_CREAT is present in 'flags' (to support both the 2
      argument and the 3 argument forms of open; same idea for openat()).
      However, the glibc ignores the 'mode' argument if O_TMPFILE is in
      'flags'.
      
      On x86_64, for open(), it magically works anyway, as 'mode' is in
      RDX when entering open(), and is still in RDX on SYSCALL, which is where
      the kernel looks for the 3rd argument of a syscall.
      
      But openat() is not quite so lucky: 'mode' is in RCX when entering the
      glibc wrapper for openat(), while the kernel looks for the 4th argument
      of a syscall in R10. Indeed, the syscall calling convention differs from
      the regular calling convention in this respect on x86_64. So the kernel
      sees mode = 0 when trying to use glibc openat() with O_TMPFILE, and
      fails with EACCES.
      Signed-off-by: default avatarEric Rannaud <e@nanocritical.com>
      Acked-by: default avatarAndy Lutomirski <luto@amacapital.net>
      Cc: stable@vger.kernel.org
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      69a91c23
    • Linus Torvalds's avatar
      Merge tag 'fbdev-fixes-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux · 3a2f22b7
      Linus Torvalds authored
      Pull fbdev fixes from Tomi Valkeinen:
      
       - fix fb console option parsing
      
       - fixes for OMAPDSS/OMAPFB crashes related to module unloading and
         device/driver binding & unbinding.
      
       - fix for OMAP HDMI PLL locking failing in certain cases
      
       - misc minor fixes for atmel lcdfb and OMAP
      
      * tag 'fbdev-fixes-3.18' of git://git.kernel.org/pub/scm/linux/kernel/git/tomba/linux:
        omap: dss: connector-analog-tv: Add missing module device table
        OMAPDSS: DSI: Fix PLL_SELFEQDCO field width
        OMAPDSS: fix dispc register dump for preload & mflag
        OMAPDSS: DISPC: fix mflag offset
        OMAPDSS: HDMI: fix regsd write
        OMAPDSS: HDMI: fix PLL GO bit handling
        OMAPFB: fix releasing overlays
        OMAPFB: fix overlay disable when freeing resources.
        OMAPDSS: apply: wait pending updates on manager disable
        OMAPFB: remove __exit annotation
        OMAPDSS: set suppress_bind_attrs
        OMAPFB: add missing MODULE_ALIAS()
        drivers: video: fbdev: atmel_lcdfb.c: remove unnecessary header
        video/console: Resolve several shadow warnings
        fbcon: Fix option parsing control flow in fb_console_setup
      3a2f22b7
    • Linus Torvalds's avatar
      Merge tag 'sound-3.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound · 94712927
      Linus Torvalds authored
      Pull sound fixes from Takashi Iwai:
       "Although the diffstat looks scary, it's just because of the removal of
        the dead code (s6000), thus it must not affect anything serious.
      
        Other than that, all small fixes.  The only core fix is zero-clear for
        a PCM compat ioctl.  The rest are driver-specific, bebob, sgtl500,
        adau1761, intel-sst, ad1889 and a few HD-audio quirks as usual"
      
      * tag 'sound-3.18-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
        ALSA: hda - Add workaround for CMI8888 snoop behavior
        ALSA: pcm: Zero-clear reserved fields of PCM status ioctl in compat mode
        ALSA: bebob: Uninitialized id returned by saffirepro_both_clk_src_get
        ALSA: hda/realtek - New SSID for Headset quirk
        ALSA: ad1889: Fix probable mask then right shift defects
        ALSA: bebob: fix wrong decoding of clock information for Terratec PHASE 88 Rack FW
        ALSA: hda/realtek - Update restore default value for ALC283
        ALSA: hda/realtek - Update restore default value for ALC282
        ASoC: fsl: use strncpy() to prevent copying of over-long names
        ASoC: adau1761: Fix input PGA volume
        ASoC: s6000: remove driver
        ASoC: Intel: HSW/BDW only support S16 and S24 formats.
        ASoC: sgtl500: Document the required supplies
      94712927
    • Tomi Valkeinen's avatar
      a942535d
    • Marek Belisko's avatar
      omap: dss: connector-analog-tv: Add missing module device table · 4ee9d9d2
      Marek Belisko authored
      Without that fix connector-analog-tv driver isn't probed when compiled
      as module.
      Signed-off-by: default avatarH. Nikolaus Schaller <hns@goldelico.com>
      Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
      4ee9d9d2
  2. 29 Oct, 2014 30 commits
    • Linus Torvalds's avatar
      Merge branch 'akpm' (incoming from Andrew Morton) · a7ca10f2
      Linus Torvalds authored
      Merge misc fixes from Andrew Morton:
       "21 fixes"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>: (21 commits)
        mm/balloon_compaction: fix deflation when compaction is disabled
        sh: fix sh770x SCIF memory regions
        zram: avoid NULL pointer access in concurrent situation
        mm/slab_common: don't check for duplicate cache names
        ocfs2: fix d_splice_alias() return code checking
        mm: rmap: split out page_remove_file_rmap()
        mm: memcontrol: fix missed end-writeback page accounting
        mm: page-writeback: inline account_page_dirtied() into single caller
        lib/bitmap.c: fix undefined shift in __bitmap_shift_{left|right}()
        drivers/rtc/rtc-bq32k.c: fix register value
        memory-hotplug: clear pgdat which is allocated by bootmem in try_offline_node()
        drivers/rtc/rtc-s3c.c: fix initialization failure without rtc source clock
        kernel/kmod: fix use-after-free of the sub_info structure
        drivers/rtc/rtc-pm8xxx.c: rework to support pm8941 rtc
        mm, thp: fix collapsing of hugepages on madvise
        drivers: of: add return value to of_reserved_mem_device_init()
        mm: free compound page with correct order
        gcov: add ARM64 to GCOV_PROFILE_ALL
        fsnotify: next_i is freed during fsnotify_unmount_inodes.
        mm/compaction.c: avoid premature range skip in isolate_migratepages_range
        ...
      a7ca10f2
    • Konstantin Khlebnikov's avatar
      mm/balloon_compaction: fix deflation when compaction is disabled · 4d88e6f7
      Konstantin Khlebnikov authored
      If CONFIG_BALLOON_COMPACTION=n balloon_page_insert() does not link pages
      with balloon and doesn't set PagePrivate flag, as a result
      balloon_page_dequeue() cannot get any pages because it thinks that all
      of them are isolated.  Without balloon compaction nobody can isolate
      ballooned pages.  It's safe to remove this check.
      
      Fixes: d6d86c0a ("mm/balloon_compaction: redesign ballooned pages management").
      Signed-off-by: default avatarKonstantin Khlebnikov <k.khlebnikov@samsung.com>
      Reported-by: default avatarMatt Mullins <mmullins@mmlx.us>
      Cc: <stable@vger.kernel.org>	[3.17]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      4d88e6f7
    • Andriy Skulysh's avatar
      sh: fix sh770x SCIF memory regions · 5417421b
      Andriy Skulysh authored
      Resources scif1_resources & scif2_resources overlap.  Actual SCIF region
      size is 0x10.
      
      This is regression from commit d850acf9 ("sh: Declare SCIF register
      base and IRQ as resources")
      Signed-off-by: default avatarAndriy Skulysh <askulysh@gmail.com>
      Acked-by: default avatarLaurent Pinchart <laurent.pinchart@ideasonboard.com>
      Cc: Geert Uytterhoeven <geert@linux-m68k.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>
      5417421b
    • Weijie Yang's avatar
      zram: avoid NULL pointer access in concurrent situation · 5a99e95b
      Weijie Yang authored
      There is a rare NULL pointer bug in mem_used_total_show() and
      mem_used_max_store() in concurrent situation, like this:
      
      zram is not initialized, process A is a mem_used_total reader which runs
      periodically, while process B try to init zram.
      
      	process A 				process B
        access meta, get a NULL value
      						init zram, done
        init_done() is true
        access meta->mem_pool, get a NULL pointer BUG
      
      This patch fixes this issue.
      Signed-off-by: default avatarWeijie Yang <weijie.yang@samsung.com>
      Acked-by: default avatarMinchan Kim <minchan@kernel.org>
      Acked-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5a99e95b
    • Mikulas Patocka's avatar
      mm/slab_common: don't check for duplicate cache names · 8aba7e0a
      Mikulas Patocka authored
      The SLUB cache merges caches with the same size and alignment and there
      was long standing bug with this behavior:
      
       - create the cache named "foo"
       - create the cache named "bar" (which is merged with "foo")
       - delete the cache named "foo" (but it stays allocated because "bar"
         uses it)
       - create the cache named "foo" again - it fails because the name "foo"
         is already used
      
      That bug was fixed in commit 69461747 ("slab_common: fix the check
      for duplicate slab names") by not warning on duplicate cache names when
      the SLUB subsystem is used.
      
      Recently, cache merging was implemented the with SLAB subsystem too, in
      12220dea ("mm/slab: support slab merge")).  Therefore we need stop
      checking for duplicate names even for the SLAB subsystem.
      
      This patch fixes the bug by removing the check.
      Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
      Acked-by: default avatarChristoph Lameter <cl@linux.com>
      Cc: Pekka Enberg <penberg@kernel.org>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      8aba7e0a
    • Richard Weinberger's avatar
      ocfs2: fix d_splice_alias() return code checking · d3556bab
      Richard Weinberger authored
      d_splice_alias() can return a valid dentry, NULL or an ERR_PTR.
      Currently the code checks not for ERR_PTR and will cuase an oops in
      ocfs2_dentry_attach_lock().  Fix this by using IS_ERR_OR_NULL().
      Signed-off-by: default avatarRichard Weinberger <richard@nod.at>
      Cc: Mark Fasheh <mfasheh@suse.com>
      Cc: Joel Becker <jlbec@evilplan.org>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d3556bab
    • Johannes Weiner's avatar
      mm: rmap: split out page_remove_file_rmap() · 8186eb6a
      Johannes Weiner authored
      page_remove_rmap() has too many branches on PageAnon() and is hard to
      follow.  Move the file part into a separate function.
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Reviewed-by: default avatarMichal Hocko <mhocko@suse.cz>
      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>
      8186eb6a
    • Johannes Weiner's avatar
      mm: memcontrol: fix missed end-writeback page accounting · d7365e78
      Johannes Weiner authored
      Commit 0a31bc97 ("mm: memcontrol: rewrite uncharge API") changed
      page migration to uncharge the old page right away.  The page is locked,
      unmapped, truncated, and off the LRU, but it could race with writeback
      ending, which then doesn't unaccount the page properly:
      
      test_clear_page_writeback()              migration
                                                 wait_on_page_writeback()
        TestClearPageWriteback()
                                                 mem_cgroup_migrate()
                                                   clear PCG_USED
        mem_cgroup_update_page_stat()
          if (PageCgroupUsed(pc))
            decrease memcg pages under writeback
      
        release pc->mem_cgroup->move_lock
      
      The per-page statistics interface is heavily optimized to avoid a
      function call and a lookup_page_cgroup() in the file unmap fast path,
      which means it doesn't verify whether a page is still charged before
      clearing PageWriteback() and it has to do it in the stat update later.
      
      Rework it so that it looks up the page's memcg once at the beginning of
      the transaction and then uses it throughout.  The charge will be
      verified before clearing PageWriteback() and migration can't uncharge
      the page as long as that is still set.  The RCU lock will protect the
      memcg past uncharge.
      
      As far as losing the optimization goes, the following test results are
      from a microbenchmark that maps, faults, and unmaps a 4GB sparse file
      three times in a nested fashion, so that there are two negative passes
      that don't account but still go through the new transaction overhead.
      There is no actual difference:
      
       old:     33.195102545 seconds time elapsed       ( +-  0.01% )
       new:     33.199231369 seconds time elapsed       ( +-  0.03% )
      
      The time spent in page_remove_rmap()'s callees still adds up to the
      same, but the time spent in the function itself seems reduced:
      
           # Children      Self  Command        Shared Object       Symbol
       old:     0.12%     0.11%  filemapstress  [kernel.kallsyms]   [k] page_remove_rmap
       new:     0.12%     0.08%  filemapstress  [kernel.kallsyms]   [k] page_remove_rmap
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Vladimir Davydov <vdavydov@parallels.com>
      Cc: <stable@vger.kernel.org>	[3.17.x]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      d7365e78
    • Johannes Weiner's avatar
      mm: page-writeback: inline account_page_dirtied() into single caller · 3a3c02ec
      Johannes Weiner authored
      A follow-up patch would have changed the call signature.  To save the
      trouble, just fold it instead.
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Vladimir Davydov <vdavydov@parallels.com>
      Cc: <stable@vger.kernel.org>	[3.17.x]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      3a3c02ec
    • Jan Kara's avatar
      lib/bitmap.c: fix undefined shift in __bitmap_shift_{left|right}() · ea5d05b3
      Jan Kara authored
      If __bitmap_shift_left() or __bitmap_shift_right() are asked to shift by
      a multiple of BITS_PER_LONG, they will try to shift a long value by
      BITS_PER_LONG bits which is undefined.  Change the functions to avoid
      the undefined shift.
      
      Coverity id: 1192175
      Coverity id: 1192174
      Signed-off-by: default avatarJan Kara <jack@suse.cz>
      Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
      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>
      ea5d05b3
    • Pavel Machek's avatar
      drivers/rtc/rtc-bq32k.c: fix register value · 5a6e7599
      Pavel Machek authored
      Fix register value in bq32000 trickle charging.
      
      Mike reported that I'm using wrong value in one trickle-charging case,
      and after checking docs, I must admit he's right.
      Signed-off-by: default avatarPavel Machek <pavel@denx.de>
      Reported-by: default avatarMike Bremford <mike@bfo.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5a6e7599
    • Yasuaki Ishimatsu's avatar
      memory-hotplug: clear pgdat which is allocated by bootmem in try_offline_node() · 35dca71c
      Yasuaki Ishimatsu authored
      When hot adding the same memory after hot removal, the following
      messages are shown:
      
        WARNING: CPU: 20 PID: 6 at mm/page_alloc.c:4968 free_area_init_node+0x3fe/0x426()
        ...
        Call Trace:
          dump_stack+0x46/0x58
          warn_slowpath_common+0x81/0xa0
          warn_slowpath_null+0x1a/0x20
          free_area_init_node+0x3fe/0x426
          hotadd_new_pgdat+0x90/0x110
          add_memory+0xd4/0x200
          acpi_memory_device_add+0x1aa/0x289
          acpi_bus_attach+0xfd/0x204
          acpi_bus_attach+0x178/0x204
          acpi_bus_scan+0x6a/0x90
          acpi_device_hotplug+0xe8/0x418
          acpi_hotplug_work_fn+0x1f/0x2b
          process_one_work+0x14e/0x3f0
          worker_thread+0x11b/0x510
          kthread+0xe1/0x100
          ret_from_fork+0x7c/0xb0
      
      The detaled explanation is as follows:
      
      When hot removing memory, pgdat is set to 0 in try_offline_node().  But
      if the pgdat is allocated by bootmem allocator, the clearing step is
      skipped.
      
      And when hot adding the same memory, the uninitialized pgdat is reused.
      But free_area_init_node() checks wether pgdat is set to zero.  As a
      result, free_area_init_node() hits WARN_ON().
      
      This patch clears pgdat which is allocated by bootmem allocator in
      try_offline_node().
      Signed-off-by: default avatarYasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
      Cc: Zhang Zhen <zhenzhang.zhang@huawei.com>
      Cc: Wang Nan <wangnan0@huawei.com>
      Cc: Tang Chen <tangchen@cn.fujitsu.com>
      Reviewed-by: default avatarToshi Kani <toshi.kani@hp.com>
      Cc: Dave Hansen <dave.hansen@intel.com>
      Cc: David Rientjes <rientjes@google.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      35dca71c
    • Marek Szyprowski's avatar
      drivers/rtc/rtc-s3c.c: fix initialization failure without rtc source clock · eaf3a659
      Marek Szyprowski authored
      Fix unconditional initialization failure on non-exynos3250 SoCs.
      
      Commit df9e26d0 ("rtc: s3c: add support for RTC of Exynos3250 SoC")
      introduced rtc source clock support, but also added initialization
      failure on SoCs, which doesn't need such clock.
      Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
      Reviewed-by: default avatarChanwoo Choi <cw00.choi@samsung.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      eaf3a659
    • Martin Schwidefsky's avatar
      kernel/kmod: fix use-after-free of the sub_info structure · 0baf2a4d
      Martin Schwidefsky authored
      Found this in the message log on a s390 system:
      
          BUG kmalloc-192 (Not tainted): Poison overwritten
          Disabling lock debugging due to kernel taint
          INFO: 0x00000000684761f4-0x00000000684761f7. First byte 0xff instead of 0x6b
          INFO: Allocated in call_usermodehelper_setup+0x70/0x128 age=71 cpu=2 pid=648
           __slab_alloc.isra.47.constprop.56+0x5f6/0x658
           kmem_cache_alloc_trace+0x106/0x408
           call_usermodehelper_setup+0x70/0x128
           call_usermodehelper+0x62/0x90
           cgroup_release_agent+0x178/0x1c0
           process_one_work+0x36e/0x680
           worker_thread+0x2f0/0x4f8
           kthread+0x10a/0x120
           kernel_thread_starter+0x6/0xc
           kernel_thread_starter+0x0/0xc
          INFO: Freed in call_usermodehelper_exec+0x110/0x1b8 age=71 cpu=2 pid=648
           __slab_free+0x94/0x560
           kfree+0x364/0x3e0
           call_usermodehelper_exec+0x110/0x1b8
           cgroup_release_agent+0x178/0x1c0
           process_one_work+0x36e/0x680
           worker_thread+0x2f0/0x4f8
           kthread+0x10a/0x120
           kernel_thread_starter+0x6/0xc
           kernel_thread_starter+0x0/0xc
      
      There is a use-after-free bug on the subprocess_info structure allocated
      by the user mode helper.  In case do_execve() returns with an error
      ____call_usermodehelper() stores the error code to sub_info->retval, but
      sub_info can already have been freed.
      
      Regarding UMH_NO_WAIT, the sub_info structure can be freed by
      __call_usermodehelper() before the worker thread returns from
      do_execve(), allowing memory corruption when do_execve() failed after
      exec_mmap() is called.
      
      Regarding UMH_WAIT_EXEC, the call to umh_complete() allows
      call_usermodehelper_exec() to continue which then frees sub_info.
      
      To fix this race the code needs to make sure that the call to
      call_usermodehelper_freeinfo() is always done after the last store to
      sub_info->retval.
      Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
      Reviewed-by: default avatarOleg Nesterov <oleg@redhat.com>
      Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      0baf2a4d
    • Stanimir Varbanov's avatar
      drivers/rtc/rtc-pm8xxx.c: rework to support pm8941 rtc · c8d523a4
      Stanimir Varbanov authored
      Adds support for RTC device inside PM8941 PMIC.  The RTC in this PMIC
      have two register spaces.  Thus the rtc-pm8xxx is slightly reworked to
      reflect these differences.
      
      The register set for different PMIC chips are selected on DT compatible
      string base.
      
      [akpm@linux-foundation.org: coding-style fixes]
      [akpm@linux-foundation.org: simplify and fix locking in pm8xxx_rtc_set_time()]
      Signed-off-by: default avatarStanimir Varbanov <svarbanov@mm-sol.com>
      Cc: Alessandro Zummo <a.zummo@towertech.it>
      Cc: Stephen Boyd <sboyd@codeaurora.org>
      Cc: Josh Cartwright <joshc@codeaurora.org>
      Cc: Stanimir Varbanov <svarbanov@mm-sol.com>
      Cc: Dan 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>
      c8d523a4
    • David Rientjes's avatar
      mm, thp: fix collapsing of hugepages on madvise · 6d50e60c
      David Rientjes authored
      If an anonymous mapping is not allowed to fault thp memory and then
      madvise(MADV_HUGEPAGE) is used after fault, khugepaged will never
      collapse this memory into thp memory.
      
      This occurs because the madvise(2) handler for thp, hugepage_madvise(),
      clears VM_NOHUGEPAGE on the stack and it isn't stored in vma->vm_flags
      until the final action of madvise_behavior().  This causes the
      khugepaged_enter_vma_merge() to be a no-op in hugepage_madvise() when
      the vma had previously had VM_NOHUGEPAGE set.
      
      Fix this by passing the correct vma flags to the khugepaged mm slot
      handler.  There's no chance khugepaged can run on this vma until after
      madvise_behavior() returns since we hold mm->mmap_sem.
      
      It would be possible to clear VM_NOHUGEPAGE directly from vma->vm_flags
      in hugepage_advise(), but I didn't want to introduce special case
      behavior into madvise_behavior().  I think it's best to just let it
      always set vma->vm_flags itself.
      Signed-off-by: default avatarDavid Rientjes <rientjes@google.com>
      Reported-by: default avatarSuleiman Souhlal <suleiman@google.com>
      Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      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>
      6d50e60c
    • Marek Szyprowski's avatar
      drivers: of: add return value to of_reserved_mem_device_init() · 47f29df7
      Marek Szyprowski authored
      Driver calling of_reserved_mem_device_init() might be interested if the
      initialization has been successful or not, so add support for returning
      error code.
      
      This fixes a build warining caused by commit 7bfa5ab6 ("drivers:
      dma-coherent: add initialization from device tree"), which has been
      merged without this change and without fixing function return value.
      
      Fixes: 7bfa5ab6 ("drivers: dma-coherent: add initialization from device tree")
      Signed-off-by: default avatarMarek Szyprowski <m.szyprowski@samsung.com>
      Acked-by: default avatarArnd Bergmann <arnd@arndb.de>
      Cc: Michal Nazarewicz <mina86@mina86.com>
      Cc: Grant Likely <grant.likely@linaro.org>
      Cc: Laura Abbott <lauraa@codeaurora.org>
      Cc: Josh Cartwright <joshc@codeaurora.org>
      Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
      Cc: Kyungmin Park <kyungmin.park@samsung.com>
      Cc: Russell King <rmk+kernel@arm.linux.org.uk>
      Cc: Stephen Rothwell <sfr@canb.auug.org.au>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      47f29df7
    • Yu Zhao's avatar
      mm: free compound page with correct order · 5ddacbe9
      Yu Zhao authored
      Compound page should be freed by put_page() or free_pages() with correct
      order.  Not doing so will cause tail pages leaked.
      
      The compound order can be obtained by compound_order() or use
      HPAGE_PMD_ORDER in our case.  Some people would argue the latter is
      faster but I prefer the former which is more general.
      
      This bug was observed not just on our servers (the worst case we saw is
      11G leaked on a 48G machine) but also on our workstations running Ubuntu
      based distro.
      
        $ cat /proc/vmstat  | grep thp_zero_page_alloc
        thp_zero_page_alloc 55
        thp_zero_page_alloc_failed 0
      
      This means there is (thp_zero_page_alloc - 1) * (2M - 4K) memory leaked.
      
      Fixes: 97ae1749 ("thp: implement refcounting for huge zero page")
      Signed-off-by: default avatarYu Zhao <yuzhao@google.com>
      Acked-by: default avatarKirill A. Shutemov <kirill.shutemov@linux.intel.com>
      Cc: Andrea Arcangeli <aarcange@redhat.com>
      Cc: Mel Gorman <mel@csn.ul.ie>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Bob Liu <lliubbo@gmail.com>
      Cc: <stable@vger.kernel.org>	[3.8+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      5ddacbe9
    • Riku Voipio's avatar
      gcov: add ARM64 to GCOV_PROFILE_ALL · f601de20
      Riku Voipio authored
      Following up the arm testing of gcov, turns out gcov on ARM64 works fine
      as well.  Only change needed is adding ARM64 to Kconfig depends.
      
      Tested with qemu and mach-virt
      Signed-off-by: default avatarRiku Voipio <riku.voipio@linaro.org>
      Acked-by: default avatarPeter Oberparleiter <oberpar@linux.vnet.ibm.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f601de20
    • Jerry Hoemann's avatar
      fsnotify: next_i is freed during fsnotify_unmount_inodes. · 6424babf
      Jerry Hoemann authored
      During file system stress testing on 3.10 and 3.12 based kernels, the
      umount command occasionally hung in fsnotify_unmount_inodes in the
      section of code:
      
                      spin_lock(&inode->i_lock);
                      if (inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) {
                              spin_unlock(&inode->i_lock);
                              continue;
                      }
      
      As this section of code holds the global inode_sb_list_lock, eventually
      the system hangs trying to acquire the lock.
      
      Multiple crash dumps showed:
      
      The inode->i_state == 0x60 and i_count == 0 and i_sb_list would point
      back at itself.  As this is not the value of list upon entry to the
      function, the kernel never exits the loop.
      
      To help narrow down problem, the call to list_del_init in
      inode_sb_list_del was changed to list_del.  This poisons the pointers in
      the i_sb_list and causes a kernel to panic if it transverse a freed
      inode.
      
      Subsequent stress testing paniced in fsnotify_unmount_inodes at the
      bottom of the list_for_each_entry_safe loop showing next_i had become
      free.
      
      We believe the root cause of the problem is that next_i is being freed
      during the window of time that the list_for_each_entry_safe loop
      temporarily releases inode_sb_list_lock to call fsnotify and
      fsnotify_inode_delete.
      
      The code in fsnotify_unmount_inodes attempts to prevent the freeing of
      inode and next_i by calling __iget.  However, the code doesn't do the
      __iget call on next_i
      
      	if i_count == 0 or
      	if i_state & (I_FREEING | I_WILL_FREE)
      
      The patch addresses this issue by advancing next_i in the above two cases
      until we either find a next_i which we can __iget or we reach the end of
      the list.  This makes the handling of next_i more closely match the
      handling of the variable "inode."
      
      The time to reproduce the hang is highly variable (from hours to days.) We
      ran the stress test on a 3.10 kernel with the proposed patch for a week
      without failure.
      
      During list_for_each_entry_safe, next_i is becoming free causing
      the loop to never terminate.  Advance next_i in those cases where
      __iget is not done.
      Signed-off-by: default avatarJerry Hoemann <jerry.hoemann@hp.com>
      Cc: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
      Cc: Ken Helias <kenhelias@firemail.de>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6424babf
    • Joonsoo Kim's avatar
      mm/compaction.c: avoid premature range skip in isolate_migratepages_range · 6ea41c0c
      Joonsoo Kim authored
      Commit edc2ca61 ("mm, compaction: move pageblock checks up from
      isolate_migratepages_range()") commonizes isolate_migratepages variants
      and make them use isolate_migratepages_block().
      
      isolate_migratepages_block() could stop the execution when enough pages
      are isolated, but, there is no code in isolate_migratepages_range() to
      handle this case.  In the result, even if isolate_migratepages_block()
      returns prematurely without checking all pages in the range,
      
      isolate_migratepages_block() is called repeately on the following
      pageblock and some pages in the previous range are skipped to check.
      Then, CMA is failed frequently due to this fact.
      
      To fix this problem, this patch let isolate_migratepages_range() know
      the situation that enough pages are isolated and stop the isolation in
      that case.
      
      Note that isolate_migratepages() has no such problem, because, it always
      stops the isolation after just one call of isolate_migratepages_block().
      Signed-off-by: default avatarJoonsoo Kim <iamjoonsoo.kim@lge.com>
      Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
      Cc: David Rientjes <rientjes@google.com>
      Cc: Minchan Kim <minchan@kernel.org>
      Cc: Michal Nazarewicz <mina86@mina86.com>
      Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
      Cc: Christoph Lameter <cl@linux.com>
      Cc: Rik van Riel <riel@redhat.com>
      Cc: Mel Gorman <mgorman@suse.de>
      Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      6ea41c0c
    • Wang Nan's avatar
      cgroup/kmemleak: add kmemleak_free() for cgroup deallocations. · 401507d6
      Wang Nan authored
      Commit ff7ee93f ("cgroup/kmemleak: Annotate alloc_page() for cgroup
      allocations") introduces kmemleak_alloc() for alloc_page_cgroup(), but
      corresponding kmemleak_free() is missing, which makes kmemleak be
      wrongly disabled after memory offlining.  Log is pasted at the end of
      this commit message.
      
      This patch add kmemleak_free() into free_page_cgroup().  During page
      offlining, this patch removes corresponding entries in kmemleak rbtree.
      After that, the freed memory can be allocated again by other subsystems
      without killing kmemleak.
      
        bash # for x in 1 2 3 4; do echo offline > /sys/devices/system/memory/memory$x/state ; sleep 1; done ; dmesg | grep leak
      
        Offlined Pages 32768
        kmemleak: Cannot insert 0xffff880016969000 into the object search tree (overlaps existing)
        CPU: 0 PID: 412 Comm: sleep Not tainted 3.17.0-rc5+ #86
        Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
        Call Trace:
          dump_stack+0x46/0x58
          create_object+0x266/0x2c0
          kmemleak_alloc+0x26/0x50
          kmem_cache_alloc+0xd3/0x160
          __sigqueue_alloc+0x49/0xd0
          __send_signal+0xcb/0x410
          send_signal+0x45/0x90
          __group_send_sig_info+0x13/0x20
          do_notify_parent+0x1bb/0x260
          do_exit+0x767/0xa40
          do_group_exit+0x44/0xa0
          SyS_exit_group+0x17/0x20
          system_call_fastpath+0x16/0x1b
      
        kmemleak: Kernel memory leak detector disabled
        kmemleak: Object 0xffff880016900000 (size 524288):
        kmemleak:   comm "swapper/0", pid 0, jiffies 4294667296
        kmemleak:   min_count = 0
        kmemleak:   count = 0
        kmemleak:   flags = 0x1
        kmemleak:   checksum = 0
        kmemleak:   backtrace:
              log_early+0x63/0x77
              kmemleak_alloc+0x4b/0x50
              init_section_page_cgroup+0x7f/0xf5
              page_cgroup_init+0xc5/0xd0
              start_kernel+0x333/0x408
              x86_64_start_reservations+0x2a/0x2c
              x86_64_start_kernel+0xf5/0xfc
      
      Fixes: ff7ee93f (cgroup/kmemleak: Annotate alloc_page() for cgroup allocations)
      Signed-off-by: default avatarWang Nan <wangnan0@huawei.com>
      Acked-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Acked-by: default avatarMichal Hocko <mhocko@suse.cz>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: <stable@vger.kernel.org>	[3.2+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      401507d6
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.dk/linux-block · d506aa68
      Linus Torvalds authored
      Pull block layer fixes from Jens Axboe:
       "A small collection of fixes for the current kernel.  This contains:
      
         - Two error handling fixes from Jan Kara.  One for null_blk on
           failure to add a device, and the other for the block/scsi_ioctl
           SCSI_IOCTL_SEND_COMMAND fixing up the error jump point.
      
         - A commit added in the merge window for the bio integrity bits
           unfortunately disabled merging for all requests if
           CONFIG_BLK_DEV_INTEGRITY wasn't set.  Reverse the logic, so that
           integrity checking wont disallow merges when not enabled.
      
         - A fix from Ming Lei for merging and generating too many segments.
           This caused a BUG in virtio_blk.
      
         - Two error handling printk() fixups from Robert Elliott, improving
           the information given when we rate limit.
      
         - Error handling fixup on elevator_init() failure from Sudip
           Mukherjee.
      
         - A fix from Tony Battersby, fixing up a memory leak in the
           scatterlist handling with scsi-mq"
      
      * 'for-linus' of git://git.kernel.dk/linux-block:
        block: Fix merge logic when CONFIG_BLK_DEV_INTEGRITY is not defined
        lib/scatterlist: fix memory leak with scsi-mq
        block: fix wrong error return in elevator_init()
        scsi: Fix error handling in SCSI_IOCTL_SEND_COMMAND
        null_blk: Cleanup error recovery in null_add_dev()
        blk-merge: recaculate segment if it isn't less than max segments
        fs: clarify rate limit suppressed buffer I/O errors
        fs: merge I/O error prints into one line
      d506aa68
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid · 7f474df0
      Linus Torvalds authored
      Pull HID fixes from Jiri Kosina:
       - workarounds for a couple of misbehaving Elan Touchscreens, by Adel
         Gadllah
       - fix for TransducerSerialNumber field implementation, by Jason Gerecke
       - a couple of new HID usages (added by HUT), by Olivier Gay
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
        HID: input: Fix TransducerSerialNumber implementation
        HID: add keyboard input assist hid usages
        HID: usbhid: enable always-poll quirk for Elan Touchscreen 016f
        HID: usbhid: enable always-poll quirk for Elan Touchscreen 009b
      7f474df0
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security · 8c782932
      Linus Torvalds authored
      Pull Integrity subsystem fix from James Morris:
       "These changes fix a bug in xattr handling, where the evm and ima
        inode_setxattr() functions do not check for empty xattrs being passed
        from userspace (leading to user-triggerable null pointer
        dereferences)"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security:
        evm: check xattr value length and type in evm_inode_setxattr()
        ima: check xattr value length and type in the ima_inode_setxattr()
      8c782932
    • Linus Torvalds's avatar
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux · 19be9e8a
      Linus Torvalds authored
      Pull powerpc updates from Michael Ellerman:
       "There's some bug fixes or cleanups to facilitate fixes, a MAINTAINERS
        update, and a new syscall (bpf)"
      
      * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mpe/linux:
        powerpc/numa: ensure per-cpu NUMA mappings are correct on topology update
        powerpc/numa: use cached value of update->cpu in update_cpu_topology
        cxl: Fix PSL error due to duplicate segment table entries
        powerpc/mm: Use appropriate ESID mask in copro_calculate_slb()
        cxl: Refactor cxl_load_segment() and find_free_sste()
        cxl: Disable secondary hash in segment table
        Revert "powerpc/powernv: Fix endian bug in LPC bus debugfs accessors"
        powernv: Use _GLOBAL_TOC for opal wrappers
        powerpc: Wire up sys_bpf() syscall
        MAINTAINERS: nx-842 driver maintainer change
        powerpc/mm: Remove redundant #if case
        powerpc/mm: Fix build error with hugetlfs disabled
      19be9e8a
    • Takashi Iwai's avatar
      ALSA: hda - Add workaround for CMI8888 snoop behavior · 3b70bdba
      Takashi Iwai authored
      CMI8888 shows the stuttering playback when the snooping is disabled
      on the audio buffer.  Meanwhile, we've got reports that CORB/RIRB
      doesn't work in the snooped mode.  So, as a compromise, disable the
      snoop only for CORB/RIRB and enable the snoop for the stream buffers.
      
      The resultant patch became a bit ugly, unfortunately, but we still can
      live with it.
      Reported-and-tested-by: default avatarGeoffrey McRae <geoff@spacevs.com>
      Cc: <stable@vger.kernel.org> # 3.17+
      Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
      3b70bdba
    • Jason Gerecke's avatar
      HID: input: Fix TransducerSerialNumber implementation · 5989a55a
      Jason Gerecke authored
      The commit which introduced TransducerSerialNumber (368c9664) is missing
      two crucial implementation details. Firstly, the commit does not set the
      type/code/bit/max fields as expected later down the code which can cause
      the driver to crash when a tablet with this usage is connected. Secondly,
      the call to 'set_bit' causes MSC_PULSELED to be sent instead of the
      expected MSC_SERIAL. This commit addreses both issues.
      Signed-off-by: default avatarJason Gerecke <jason.gerecke@wacom.com>
      Reviewed-by: default avatarBenjamin Tissoires <benjamin.tissoires@redhat.com>
      Reviewed-by: default avatarPing Cheng <pingc@wacom.com>
      Signed-off-by: default avatarJiri Kosina <jkosina@suse.cz>
      5989a55a
    • James Morris's avatar
      Merge branch 'for-linus' of... · 6c880ad5
      James Morris authored
      Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity into for-linus
      6c880ad5
    • Martin K. Petersen's avatar
      block: Fix merge logic when CONFIG_BLK_DEV_INTEGRITY is not defined · cb1a5ab6
      Martin K. Petersen authored
      Commit 4eaf99be switched to returning bool and as a result reversed
      the logic of the integrity merge checks.  However, the empty stubs used
      when the block integrity code is compiled out were still returning
      0. Make these stubs return "true".
      Signed-off-by: default avatarMartin K. Petersen <martin.petersen@oracle.com>
      Reported-by: default avatarMichael L. Semon <mlsemon35@gmail.com>
      Tested-by: default avatarMichael L. Semon <mlsemon35@gmail.com>
      Signed-off-by: default avatarJens Axboe <axboe@fb.com>
      cb1a5ab6
  3. 28 Oct, 2014 5 commits