1. 21 Feb, 2009 4 commits
  2. 19 Feb, 2009 33 commits
  3. 18 Feb, 2009 3 commits
    • Ingo Molnar's avatar
      inotify: fix GFP_KERNEL related deadlock · f04b30de
      Ingo Molnar authored
      
      
      Enhanced lockdep coverage of __GFP_NOFS turned up this new lockdep
      assert:
      
      [ 1093.677775]
      [ 1093.677781] =================================
      [ 1093.680031] [ INFO: inconsistent lock state ]
      [ 1093.680031] 2.6.29-rc5-tip-01504-gb49eca1-dirty #1
      [ 1093.680031] ---------------------------------
      [ 1093.680031] inconsistent {RECLAIM_FS-ON-W} -> {IN-RECLAIM_FS-W} usage.
      [ 1093.680031] kswapd0/308 [HC0[0]:SC0[0]:HE1:SE1] takes:
      [ 1093.680031]  (&inode->inotify_mutex){+.+.?.}, at: [<c0205942>] inotify_inode_is_dead+0x20/0x80
      [ 1093.680031] {RECLAIM_FS-ON-W} state was registered at:
      [ 1093.680031]   [<c01696b9>] mark_held_locks+0x43/0x5b
      [ 1093.680031]   [<c016baa4>] lockdep_trace_alloc+0x6c/0x6e
      [ 1093.680031]   [<c01cf8b0>] kmem_cache_alloc+0x20/0x150
      [ 1093.680031]   [<c040d0ec>] idr_pre_get+0x27/0x6c
      [ 1093.680031]   [<c02056e3>] inotify_handle_get_wd+0x25/0xad
      [ 1093.680031]   [<c0205f43>] inotify_add_watch+0x7a/0x129
      [ 1093.680031]   [<c020679e>] sys_inotify_add_watch+0x20f/0x250
      [ 1093.680031]   [<c010389e>] sysenter_do_call+0x12/0x35
      [ 1093.680031]   [<ffffffff>] 0xffffffff
      [ 1093.680031] irq event stamp: 60417
      [ 1093.680031] hardirqs last  enabled at (60417): [<c018d5f5>] call_rcu+0x53/0x59
      [ 1093.680031] hardirqs last disabled at (60416): [<c018d5b9>] call_rcu+0x17/0x59
      [ 1093.680031] softirqs last  enabled at (59656): [<c0146229>] __do_softirq+0x157/0x16b
      [ 1093.680031] softirqs last disabled at (59651): [<c0106293>] do_softirq+0x74/0x15d
      [ 1093.680031]
      [ 1093.680031] other info that might help us debug this:
      [ 1093.680031] 2 locks held by kswapd0/308:
      [ 1093.680031]  #0:  (shrinker_rwsem){++++..}, at: [<c01b0502>] shrink_slab+0x36/0x189
      [ 1093.680031]  #1:  (&type->s_umount_key#4){+++++.}, at: [<c01e6d77>] shrink_dcache_memory+0x110/0x1fb
      [ 1093.680031]
      [ 1093.680031] stack backtrace:
      [ 1093.680031] Pid: 308, comm: kswapd0 Not tainted 2.6.29-rc5-tip-01504-gb49eca1-dirty #1
      [ 1093.680031] Call Trace:
      [ 1093.680031]  [<c016947a>] valid_state+0x12a/0x13d
      [ 1093.680031]  [<c016954e>] mark_lock+0xc1/0x1e9
      [ 1093.680031]  [<c016a5b4>] ? check_usage_forwards+0x0/0x3f
      [ 1093.680031]  [<c016ab74>] __lock_acquire+0x2c6/0xac8
      [ 1093.680031]  [<c01688d9>] ? register_lock_class+0x17/0x228
      [ 1093.680031]  [<c016b3d3>] lock_acquire+0x5d/0x7a
      [ 1093.680031]  [<c0205942>] ? inotify_inode_is_dead+0x20/0x80
      [ 1093.680031]  [<c08824c4>] __mutex_lock_common+0x3a/0x4cb
      [ 1093.680031]  [<c0205942>] ? inotify_inode_is_dead+0x20/0x80
      [ 1093.680031]  [<c08829ed>] mutex_lock_nested+0x2e/0x36
      [ 1093.680031]  [<c0205942>] ? inotify_inode_is_dead+0x20/0x80
      [ 1093.680031]  [<c0205942>] inotify_inode_is_dead+0x20/0x80
      [ 1093.680031]  [<c01e6672>] dentry_iput+0x90/0xc2
      [ 1093.680031]  [<c01e67a3>] d_kill+0x21/0x45
      [ 1093.680031]  [<c01e6a46>] __shrink_dcache_sb+0x27f/0x355
      [ 1093.680031]  [<c01e6dc5>] shrink_dcache_memory+0x15e/0x1fb
      [ 1093.680031]  [<c01b05ed>] shrink_slab+0x121/0x189
      [ 1093.680031]  [<c01b0d12>] kswapd+0x39f/0x561
      [ 1093.680031]  [<c01ae499>] ? isolate_pages_global+0x0/0x233
      [ 1093.680031]  [<c0157eae>] ? autoremove_wake_function+0x0/0x43
      [ 1093.680031]  [<c01b0973>] ? kswapd+0x0/0x561
      [ 1093.680031]  [<c0157daf>] kthread+0x41/0x82
      [ 1093.680031]  [<c0157d6e>] ? kthread+0x0/0x82
      [ 1093.680031]  [<c01043ab>] kernel_thread_helper+0x7/0x10
      
      inotify_handle_get_wd() does idr_pre_get() which does a
      kmem_cache_alloc() without __GFP_FS - and is hence deadlockable under
      extreme MM pressure.
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      Acked-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
      Cc: MinChan Kim <minchan.kim@gmail.com>
      Cc: Nick Piggin <nickpiggin@yahoo.com.au>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      f04b30de
    • Michael Buesch's avatar
      spi-gpio: sanitize MISO bitvalue · be50344e
      Michael Buesch authored
      
      
      gpio_get_value() returns 0 or nonzero, but getmiso() expects 0 or 1.
      Sanitize the value to a 0/1 boolean.
      Signed-off-by: default avatarMichael Buesch <mb@bu3sch.de>
      Acked-by: default avatarDavid Brownell <dbrownell@users.sourceforge.net>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      be50344e
    • Bernhard Walle's avatar
      Bernhard has moved · 97bef7dd
      Bernhard Walle authored
      
      
      Since I don't work for SUSE any more and the bwalle@suse.de address is
      invalid, correct it in the copyright headers and documentation.
      Signed-off-by: default avatarBernhard Walle <bernhard.walle@gmx.de>
      Cc: Greg KH <greg@kroah.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      97bef7dd