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  1. 07 7月, 2010 1 次提交
    • C
      Move list types from <linux/list.h> to <linux/types.h>. · de5d9bf6
      由 Chris Metcalf 提交于 
      This allows a list_head (or hlist_head, etc.) to be used from places
that used to be impractical, in particular <asm/processor.h>, which
used to cause include file recursion: <linux/list.h> includes
<linux/prefetch.h>, which always includes <asm/processor.h> for the
prefetch macros, as well as <asm/system.h>, which often includes
<asm/processor.h> directly or indirectly.

This avoids a lot of painful workaround hackery on the tile
architecture, where we use a list_head in the thread_struct to chain
together tasks that are activated on a particular hardwall.
Signed-off-by: NChris Metcalf <cmetcalf@tilera.com>
Reviewed-by: NMatthew Wilcox <willy@linux.intel.com>
      de5d9bf6
  3. 07 3月, 2010 1 次提交
  5. 16 1月, 2010 1 次提交
  7. 01 9月, 2008 1 次提交
    • V
      debugobjects: fix lockdep warning · 673d62cc
      由 Vegard Nossum 提交于 
      Daniel J. Blueman reported:
> =======================================================
> [ INFO: possible circular locking dependency detected ]
> 2.6.27-rc4-224c #1
> -------------------------------------------------------
> hald/4680 is trying to acquire lock:
>  (&n->list_lock){++..}, at: [<ffffffff802bfa26>] add_partial+0x26/0x80
>
> but task is already holding lock:
>  (&obj_hash[i].lock){++..}, at: [<ffffffff8041cfdc>]
> debug_object_free+0x5c/0x120

We fix it by moving the actual freeing to outside the lock (the lock
now only protects the list).

The pool lock is also promoted to irq-safe (suggested by Dan). It's
necessary because free_pool is now called outside the irq disabled
region. So we need to protect against an interrupt handler which calls
debug_object_init().

[tglx@linutronix.de: added hlist_move_list helper to avoid looping
		     through the list twice]
Reported-by: NDaniel J Blueman <daniel.blueman@gmail.com>
Signed-off-by: NVegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
      673d62cc
  9. 09 8月, 2008 1 次提交
  11. 07 8月, 2008 2 次提交
  13. 26 7月, 2008 1 次提交
  15. 19 5月, 2008 1 次提交
  17. 30 4月, 2008 1 次提交
  19. 29 4月, 2008 1 次提交
  21. 28 4月, 2008 1 次提交
  23. 21 4月, 2008 1 次提交
  25. 20 10月, 2007 1 次提交
    • R
      kernel-api docbook: fix content problems · 8f731f7d
      由 Randy Dunlap 提交于 
      Fix kernel-api docbook contents problems.

docproc: linux-2.6.23-git13/include/asm-x86/unaligned_32.h: No such file or directory
Warning(linux-2.6.23-git13//include/linux/list.h:482): bad line: 			of list entry
Warning(linux-2.6.23-git13//mm/filemap.c:864): No description found for parameter 'ra'
Warning(linux-2.6.23-git13//block/ll_rw_blk.c:3760): No description found for parameter 'req'
Warning(linux-2.6.23-git13//include/linux/input.h:1077): No description found for parameter 'private'
Warning(linux-2.6.23-git13//include/linux/input.h:1077): No description found for parameter 'cdev'
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: WU Fengguang <wfg@mail.ustc.edu.cn>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      8f731f7d
  27. 17 10月, 2007 1 次提交
    • D
      shrink_dcache_sb speedup · 37c42524
      由 Denis V. Lunev 提交于 
      This patch makes shrink_dcache_sb consistent with dentry pruning policy.

On the first pass we iterate over dentry unused list and prepare some
dentries for removal.

However, since the existing code moves evicted dentries to the beginning of
the LRU it can happen that fresh dentries from other superblocks will be
inserted *before* our dentries.

This can result in significant slowdown of shrink_dcache_sb().  Moreover,
for virtual filesystems like unionfs which can call dput() during dentries
kill existing code results in O(n^2) complexity.

We observed 2 minutes shrink_dcache_sb() with only 35000 dentries.

To avoid this effects we propose to isolate sb dentries at the end
of LRU list.
Signed-off-by: NDenis V. Lunev <den@openvz.org>
Signed-off-by: NKirill Korotaev <dev@openvz.org>
Signed-off-by: NAndrey Mirkin <amirkin@openvz.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      37c42524
  29. 11 10月, 2007 1 次提交
  31. 13 5月, 2007 1 次提交
  33. 09 5月, 2007 1 次提交
    • P
      Introduce a handy list_first_entry macro · b5e61818
      由 Pavel Emelianov 提交于 
      There are many places in the kernel where the construction like

   foo = list_entry(head->next, struct foo_struct, list);

are used.
The code might look more descriptive and neat if using the macro

   list_first_entry(head, type, member) \
             list_entry((head)->next, type, member)

Here is the macro itself and the examples of its usage in the generic code.
 If it will turn out to be useful, I can prepare the set of patches to
inject in into arch-specific code, drivers, networking, etc.
Signed-off-by: NPavel Emelianov <xemul@openvz.org>
Signed-off-by: NKirill Korotaev <dev@openvz.org>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Zach Brown <zach.brown@oracle.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: John McCutchan <ttb@tentacle.dhs.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Ram Pai <linuxram@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      b5e61818
  35. 12 2月, 2007 2 次提交
  37. 27 1月, 2007 1 次提交
  39. 30 9月, 2006 1 次提交
  41. 15 7月, 2006 1 次提交
  43. 28 6月, 2006 1 次提交
  45. 26 6月, 2006 2 次提交
  47. 23 6月, 2006 1 次提交
  49. 30 4月, 2006 1 次提交
  51. 21 3月, 2006 2 次提交
  53. 04 2月, 2006 1 次提交
  55. 11 1月, 2006 1 次提交
  57. 13 12月, 2005 1 次提交
  59. 07 11月, 2005 1 次提交
  61. 17 10月, 2005 1 次提交
    • H
      [PATCH] list: add missing rcu_dereference on first element · b24d18aa
      由 Herbert Xu 提交于 
      It seems that all the list_*_rcu primitives are missing a memory barrier
on the very first dereference.  For example,

#define list_for_each_rcu(pos, head) \
	for (pos = (head)->next; prefetch(pos->next), pos != (head); \
		pos = rcu_dereference(pos->next))

It will go something like:

	pos = (head)->next

	prefetch(pos->next)

	pos != (head)

	do stuff

We're missing a barrier here.

	pos = rcu_dereference(pos->next)

		fetch pos->next

		barrier given by rcu_dereference(pos->next)

		store pos

Without the missing barrier, the pos->next value may turn out to be stale.
In fact, if "do stuff" were also dereferencing pos and relying on
list_for_each_rcu to provide the barrier then it may also break.

So here is a patch to make sure that we have a barrier for the first
element in the list.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Acked-by: N"Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      b24d18aa
  63. 30 8月, 2005 4 次提交
  65. 26 6月, 2005 1 次提交
    • P
      [PATCH] RCU: clean up a few remaining synchronize_kernel() calls · b2b18660
      由 Paul E. McKenney 提交于 
      2.6.12-rc6-mm1 has a few remaining synchronize_kernel()s, some (but not
all) in comments.  This patch changes these synchronize_kernel() calls (and
comments) to synchronize_rcu() or synchronize_sched() as follows:

- arch/x86_64/kernel/mce.c mce_read(): change to synchronize_sched() to
  handle races with machine-check exceptions (synchronize_rcu() would not cut
  it given RCU implementations intended for hardcore realtime use.

- drivers/input/serio/i8042.c i8042_stop(): change to synchronize_sched() to
  handle races with i8042_interrupt() interrupt handler.  Again,
  synchronize_rcu() would not cut it given RCU implementations intended for
  hardcore realtime use.

- include/*/kdebug.h comments: change to synchronize_sched() to handle races
  with NMIs.  As before, synchronize_rcu() would not cut it...

- include/linux/list.h comment: change to synchronize_rcu(), since this
  comment is for list_del_rcu().

- security/keys/key.c unregister_key_type(): change to synchronize_rcu(),
  since this is interacting with RCU read side.

- security/keys/process_keys.c install_session_keyring(): change to
  synchronize_rcu(), since this is interacting with RCU read side.
Signed-off-by: N"Paul E. McKenney" <paulmck@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
      b2b18660