[patch 00/13] 2.6.23-stable review, core kernel changes

[patch 00/13] 2.6.23-stable review, core kernel changes

[Greg KH]

This is the start of the stable review cycle for the 2.6.23.X release.
There are 13 patches in this series, all will be posted as a response
to this one.  If anyone has any issues with these being applied, please
let us know.  If anyone is a maintainer of the proper subsystem, and
wants to add a Signed-off-by: line to the patch, please respond with it.

These patches are sent out with a number of different people on the
Cc: line.  If you wish to be a reviewer, please email stable@kernel.org
to add your name to the list.  If you want to be off the reviewer list,
also email us.

Responses should be made by Friday 00:00:00 UTC.  Anything received
after that time might be too late.

This set of patches focuses on only the core kernel.  Other sets of
patches will follow if you are interested in those instead.

The diffstat of this review series is included below.

thanks,

greg k-h

---------------

 Documentation/ja_JP/HOWTO |   84 ++++++++++++++++++++++++----------------------
 block/ll_rw_blk.c         |    8 +---
 fs/locks.c                |   11 ++++++
 fs/proc/array.c           |    6 ++-
 fs/splice.c               |    2 -
 include/linux/blkdev.h    |    2 -
 include/linux/sched.h     |    1 
 kernel/fork.c             |    2 +
 kernel/futex_compat.c     |   27 ++++++++++----
 kernel/lockdep.c          |   10 ++---
 kernel/params.c           |    8 +++-
 kernel/softlockup.c       |    7 ++-
 mm/filemap.c              |   13 +------
 mm/page-writeback.c       |    4 +-
 mm/shmem.c                |   15 ++++++++
 mm/slub.c                 |   22 ------------
 16 files changed, 125 insertions(+), 97 deletions(-)

[patch 01/13] lockdep: fix mismatched lockdep_depth/curr_chain_hash

[Greg KH]

[-- Attachment #1: lockdep-fix-mismatched-lockdep_depth-curr_chain_hash.patch --]
[-- Type: text/plain, Size: 2177 bytes --]


-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Gregory Haskins <ghaskins@novell.com>

patch 3aa416b07f0adf01c090baab26fb70c35ec17623 in mainline.

It is possible for the current->curr_chain_key to become inconsistent
with the current index if the chain fails to validate.  The end result
is that future lock_acquire() operations may inadvertently fail to find
a hit in the cache resulting in a new node being added to the graph for
every acquire.


Signed-off-by: Gregory Haskins <ghaskins@novell.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 kernel/lockdep.c |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/kernel/lockdep.c
+++ b/kernel/lockdep.c
@@ -1521,7 +1521,7 @@ cache_hit:
 }
 
 static int validate_chain(struct task_struct *curr, struct lockdep_map *lock,
-	       	struct held_lock *hlock, int chain_head)
+	       	struct held_lock *hlock, int chain_head, u64 chain_key)
 {
 	/*
 	 * Trylock needs to maintain the stack of held locks, but it
@@ -1534,7 +1534,7 @@ static int validate_chain(struct task_st
 	 * graph_lock for us)
 	 */
 	if (!hlock->trylock && (hlock->check == 2) &&
-			lookup_chain_cache(curr->curr_chain_key, hlock->class)) {
+			lookup_chain_cache(chain_key, hlock->class)) {
 		/*
 		 * Check whether last held lock:
 		 *
@@ -1576,7 +1576,7 @@ static int validate_chain(struct task_st
 #else
 static inline int validate_chain(struct task_struct *curr,
 	       	struct lockdep_map *lock, struct held_lock *hlock,
-		int chain_head)
+		int chain_head, u64 chain_key)
 {
 	return 1;
 }
@@ -2450,11 +2450,11 @@ static int __lock_acquire(struct lockdep
 		chain_head = 1;
 	}
 	chain_key = iterate_chain_key(chain_key, id);
-	curr->curr_chain_key = chain_key;
 
-	if (!validate_chain(curr, lock, hlock, chain_head))
+	if (!validate_chain(curr, lock, hlock, chain_head, chain_key))
 		return 0;
 
+	curr->curr_chain_key = chain_key;
 	curr->lockdep_depth++;
 	check_chain_key(curr);
 #ifdef CONFIG_DEBUG_LOCKDEP

-- 

[patch 02/13] locks: fix possible infinite loop in posix deadlock detection

[Greg KH]

[-- Attachment #1: locks-fix-possible-infinite-loop-in-posix-deadlock-detection.patch --]
[-- Type: text/plain, Size: 2089 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------

From: J. Bruce Fields <bfields@citi.umich.edu>

patch 97855b49b6bac0bd25f16b017883634d13591d00 in mainline.

It's currently possible to send posix_locks_deadlock() into an infinite
loop (under the BKL).

For now, fix this just by bailing out after a few iterations.  We may
want to fix this in a way that better clarifies the semantics of
deadlock detection.  But that will take more time, and this minimal fix
is probably adequate for any realistic scenario, and is simple enough to
be appropriate for applying to stable kernels now.

Thanks to George Davis for reporting the problem.

Cc: "George G. Davis" <gdavis@mvista.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Acked-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 fs/locks.c |   11 +++++++++++
 1 file changed, 11 insertions(+)

--- a/fs/locks.c
+++ b/fs/locks.c
@@ -694,11 +694,20 @@ EXPORT_SYMBOL(posix_test_lock);
  * Note: the above assumption may not be true when handling lock requests
  * from a broken NFS client. But broken NFS clients have a lot more to
  * worry about than proper deadlock detection anyway... --okir
+ *
+ * However, the failure of this assumption (also possible in the case of
+ * multiple tasks sharing the same open file table) also means there's no
+ * guarantee that the loop below will terminate.  As a hack, we give up
+ * after a few iterations.
  */
+
+#define MAX_DEADLK_ITERATIONS 10
+
 static int posix_locks_deadlock(struct file_lock *caller_fl,
 				struct file_lock *block_fl)
 {
 	struct list_head *tmp;
+	int i = 0;
 
 next_task:
 	if (posix_same_owner(caller_fl, block_fl))
@@ -706,6 +715,8 @@ next_task:
 	list_for_each(tmp, &blocked_list) {
 		struct file_lock *fl = list_entry(tmp, struct file_lock, fl_link);
 		if (posix_same_owner(fl, block_fl)) {
+			if (i++ > MAX_DEADLK_ITERATIONS)
+				return 0;
 			fl = fl->fl_next;
 			block_fl = fl;
 			goto next_task;

-- 

[patch 03/13] Remove broken ptrace() special-case code from file mapping

[Greg KH]

[-- Attachment #1: remove-broken-ptrace-special-case-code-from-file-mapping.patch --]
[-- Type: text/plain, Size: 2128 bytes --]


stable review patch.  If anyone has any objections, please let us know.

------------------

The kernel has for random historical reasons allowed ptrace() accesses
to access (and insert) pages into the page cache above the size of the
file.

However, Nick broke that by mistake when doing the new fault handling in
commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7 ("mm: merge populate and
nopage into fault (fixes nonlinear)".  The breakage caused a hang with
gdb when trying to access the invalid page.

The ptrace "feature" really isn't worth resurrecting, since it really is
wrong both from a portability _and_ from an internal page cache validity
standpoint.  So this removes those old broken remnants, and fixes the
ptrace() hang in the process.

Noticed and bisected by Duane Griffin, who also supplied a test-case
(quoth Nick: "Well that's probably the best bug report I've ever had,
thanks Duane!").

Cc: Duane Griffin <duaneg@dghda.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 mm/filemap.c |   13 ++-----------
 1 file changed, 2 insertions(+), 11 deletions(-)

--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1312,7 +1312,7 @@ int filemap_fault(struct vm_area_struct 
 
 	size = (i_size_read(inode) + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
 	if (vmf->pgoff >= size)
-		goto outside_data_content;
+		return VM_FAULT_SIGBUS;
 
 	/* If we don't want any read-ahead, don't bother */
 	if (VM_RandomReadHint(vma))
@@ -1389,7 +1389,7 @@ retry_find:
 	if (unlikely(vmf->pgoff >= size)) {
 		unlock_page(page);
 		page_cache_release(page);
-		goto outside_data_content;
+		return VM_FAULT_SIGBUS;
 	}
 
 	/*
@@ -1400,15 +1400,6 @@ retry_find:
 	vmf->page = page;
 	return ret | VM_FAULT_LOCKED;
 
-outside_data_content:
-	/*
-	 * An external ptracer can access pages that normally aren't
-	 * accessible..
-	 */
-	if (vma->vm_mm == current->mm)
-		return VM_FAULT_SIGBUS;
-
-	/* Fall through to the non-read-ahead case */
 no_cached_page:
 	/*
 	 * We're only likely to ever get here if MADV_RANDOM is in

-- 

[patch 04/13] param_sysfs_builtin memchr argument fix

[Greg KH]

[-- Attachment #1: param_sysfs_builtin-memchr-argument-fix.patch --]
[-- Type: text/plain, Size: 3032 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Dave Young <hidave.darkstar@gmail.com>

patch faf8c714f4508207a9c81cc94dafc76ed6680b44 in mainline.

If memchr argument is longer than strlen(kp->name), there will be some
weird result.

It will casuse duplicate filenames in sysfs for the "nousb".  kernel
warning messages are as bellow:

sysfs: duplicate filename 'usbcore' can not be created
WARNING: at fs/sysfs/dir.c:416 sysfs_add_one()
 [<c01c4750>] sysfs_add_one+0xa0/0xe0
 [<c01c4ab8>] create_dir+0x48/0xb0
 [<c01c4b69>] sysfs_create_dir+0x29/0x50
 [<c024e0fb>] create_dir+0x1b/0x50
 [<c024e3b6>] kobject_add+0x46/0x150
 [<c024e2da>] kobject_init+0x3a/0x80
 [<c053b880>] kernel_param_sysfs_setup+0x50/0xb0
 [<c053b9ce>] param_sysfs_builtin+0xee/0x130
 [<c053ba33>] param_sysfs_init+0x23/0x60
 [<c024d062>] __next_cpu+0x12/0x20
 [<c052aa30>] kernel_init+0x0/0xb0
 [<c052aa30>] kernel_init+0x0/0xb0
 [<c052a856>] do_initcalls+0x46/0x1e0
 [<c01bdb12>] create_proc_entry+0x52/0x90
 [<c0158d4c>] register_irq_proc+0x9c/0xc0
 [<c01bda94>] proc_mkdir_mode+0x34/0x50
 [<c052aa30>] kernel_init+0x0/0xb0
 [<c052aa92>] kernel_init+0x62/0xb0
 [<c0104f83>] kernel_thread_helper+0x7/0x14
 =======================
kobject_add failed for usbcore with -EEXIST, don't try to register things with the same name in the same directory.
 [<c024e466>] kobject_add+0xf6/0x150
 [<c053b880>] kernel_param_sysfs_setup+0x50/0xb0
 [<c053b9ce>] param_sysfs_builtin+0xee/0x130
 [<c053ba33>] param_sysfs_init+0x23/0x60
 [<c024d062>] __next_cpu+0x12/0x20
 [<c052aa30>] kernel_init+0x0/0xb0
 [<c052aa30>] kernel_init+0x0/0xb0
 [<c052a856>] do_initcalls+0x46/0x1e0
 [<c01bdb12>] create_proc_entry+0x52/0x90
 [<c0158d4c>] register_irq_proc+0x9c/0xc0
 [<c01bda94>] proc_mkdir_mode+0x34/0x50
 [<c052aa30>] kernel_init+0x0/0xb0
 [<c052aa92>] kernel_init+0x62/0xb0
 [<c0104f83>] kernel_thread_helper+0x7/0x14
 =======================
Module 'usbcore' failed to be added to sysfs, error number -17
The system will be unstable now.

Signed-off-by: Dave Young <hidave.darkstar@gmail.com>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 kernel/params.c |    8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

--- a/kernel/params.c
+++ b/kernel/params.c
@@ -595,11 +595,17 @@ static void __init param_sysfs_builtin(v
 
 	for (i=0; i < __stop___param - __start___param; i++) {
 		char *dot;
+		size_t kplen;
 
 		kp = &__start___param[i];
+		kplen = strlen(kp->name);
 
 		/* We do not handle args without periods. */
-		dot = memchr(kp->name, '.', MAX_KBUILD_MODNAME);
+		if (kplen > MAX_KBUILD_MODNAME) {
+			DEBUGP("kernel parameter name is too long: %s\n", kp->name);
+			continue;
+		}
+		dot = memchr(kp->name, '.', kplen);
 		if (!dot) {
 			DEBUGP("couldn't find period in %s\n", kp->name);
 			continue;

-- 

Re: [patch 04/13] param_sysfs_builtin memchr argument fix

[Chuck Ebbert]

On 11/15/2007 01:09 AM, Greg KH wrote:
> -stable review patch.  If anyone has any objections, please let us know.
> 
> ------------------
> From: Dave Young <hidave.darkstar@gmail.com>
> 
> patch faf8c714f4508207a9c81cc94dafc76ed6680b44 in mainline.
> 
> If memchr argument is longer than strlen(kp->name), there will be some
> weird result.
> 
> It will casuse duplicate filenames in sysfs for the "nousb".  kernel
> warning messages are as bellow:
> 

Needs an additional fix:

Commit:     22800a2830ec07e7cc5c837999890ac47cc7f5de
fix param_sysfs_builtin name length check

Re: [patch 04/13] param_sysfs_builtin memchr argument fix

[Greg KH]

On Thu, Nov 15, 2007 at 11:11:59AM -0500, Chuck Ebbert wrote:
> On 11/15/2007 01:09 AM, Greg KH wrote:
> > -stable review patch.  If anyone has any objections, please let us know.
> > 
> > ------------------
> > From: Dave Young <hidave.darkstar@gmail.com>
> > 
> > patch faf8c714f4508207a9c81cc94dafc76ed6680b44 in mainline.
> > 
> > If memchr argument is longer than strlen(kp->name), there will be some
> > weird result.
> > 
> > It will casuse duplicate filenames in sysfs for the "nousb".  kernel
> > warning messages are as bellow:
> > 
> 
> Needs an additional fix:
> 
> Commit:     22800a2830ec07e7cc5c837999890ac47cc7f5de
> fix param_sysfs_builtin name length check

That just went in yesterday, right?  If so, it will have to wait until
the next -stable review cycle, unless it's totally broken without that
change.

Is it?

thanks,

greg k-h

Re: [patch 04/13] param_sysfs_builtin memchr argument fix

[Chuck Ebbert]

On 11/15/2007 12:58 PM, Greg KH wrote:
> On Thu, Nov 15, 2007 at 11:11:59AM -0500, Chuck Ebbert wrote:
>> On 11/15/2007 01:09 AM, Greg KH wrote:
>>> -stable review patch.  If anyone has any objections, please let us know.
>>>
>>> ------------------
>>> From: Dave Young <hidave.darkstar@gmail.com>
>>>
>>> patch faf8c714f4508207a9c81cc94dafc76ed6680b44 in mainline.
>>>
>>> If memchr argument is longer than strlen(kp->name), there will be some
>>> weird result.
>>>
>>> It will casuse duplicate filenames in sysfs for the "nousb".  kernel
>>> warning messages are as bellow:
>>>
>> Needs an additional fix:
>>
>> Commit:     22800a2830ec07e7cc5c837999890ac47cc7f5de
>> fix param_sysfs_builtin name length check
> 
> That just went in yesterday, right?  If so, it will have to wait until
> the next -stable review cycle, unless it's totally broken without that
> change.
> 
> Is it?
> 

Yeah, pretty much AFAICT. Maybe Jan can say exactly what happened, but
it looks like the patch would cause more problems than it solves.

Re: [patch 04/13] param_sysfs_builtin memchr argument fix

[Jan Kiszka]

[-- Attachment #1: Type: text/plain, Size: 1554 bytes --]

Chuck Ebbert wrote:
> On 11/15/2007 12:58 PM, Greg KH wrote:
>> On Thu, Nov 15, 2007 at 11:11:59AM -0500, Chuck Ebbert wrote:
>>> On 11/15/2007 01:09 AM, Greg KH wrote:
>>>> -stable review patch.  If anyone has any objections, please let us know.
>>>>
>>>> ------------------
>>>> From: Dave Young <hidave.darkstar@gmail.com>
>>>>
>>>> patch faf8c714f4508207a9c81cc94dafc76ed6680b44 in mainline.
>>>>
>>>> If memchr argument is longer than strlen(kp->name), there will be some
>>>> weird result.
>>>>
>>>> It will casuse duplicate filenames in sysfs for the "nousb".  kernel
>>>> warning messages are as bellow:
>>>>
>>> Needs an additional fix:
>>>
>>> Commit:     22800a2830ec07e7cc5c837999890ac47cc7f5de
>>> fix param_sysfs_builtin name length check
>> That just went in yesterday, right?  If so, it will have to wait until
>> the next -stable review cycle, unless it's totally broken without that
>> change.
>>
>> Is it?
>>
> 
> Yeah, pretty much AFAICT. Maybe Jan can say exactly what happened, but
> it looks like the patch would cause more problems than it solves.
> 

If you have a module parameter like
"my_module.uses_long_parameter_names", Dave's patch caused it to be
rejected if that module was built into the kernel, although "my_module"
is far shorter than MAX_KBUILD_MODNAME, thus perfectly legal.

I noticed this with out-of-tree stuff, but I would bet in-tree users are
affected as well. Hmm... e.g. "nf_conntrack.expect_hashsize" should not
longer exist if nf_conntrack is non-modular.

Jan


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 249 bytes --]

Re: [patch 04/13] param_sysfs_builtin memchr argument fix

[Greg KH]

On Thu, Nov 15, 2007 at 10:20:47PM +0100, Jan Kiszka wrote:
> Chuck Ebbert wrote:
> > On 11/15/2007 12:58 PM, Greg KH wrote:
> >> On Thu, Nov 15, 2007 at 11:11:59AM -0500, Chuck Ebbert wrote:
> >>> On 11/15/2007 01:09 AM, Greg KH wrote:
> >>>> -stable review patch.  If anyone has any objections, please let us know.
> >>>>
> >>>> ------------------
> >>>> From: Dave Young <hidave.darkstar@gmail.com>
> >>>>
> >>>> patch faf8c714f4508207a9c81cc94dafc76ed6680b44 in mainline.
> >>>>
> >>>> If memchr argument is longer than strlen(kp->name), there will be some
> >>>> weird result.
> >>>>
> >>>> It will casuse duplicate filenames in sysfs for the "nousb".  kernel
> >>>> warning messages are as bellow:
> >>>>
> >>> Needs an additional fix:
> >>>
> >>> Commit:     22800a2830ec07e7cc5c837999890ac47cc7f5de
> >>> fix param_sysfs_builtin name length check
> >> That just went in yesterday, right?  If so, it will have to wait until
> >> the next -stable review cycle, unless it's totally broken without that
> >> change.
> >>
> >> Is it?
> >>
> > 
> > Yeah, pretty much AFAICT. Maybe Jan can say exactly what happened, but
> > it looks like the patch would cause more problems than it solves.
> > 
> 
> If you have a module parameter like
> "my_module.uses_long_parameter_names", Dave's patch caused it to be
> rejected if that module was built into the kernel, although "my_module"
> is far shorter than MAX_KBUILD_MODNAME, thus perfectly legal.
> 
> I noticed this with out-of-tree stuff, but I would bet in-tree users are
> affected as well. Hmm... e.g. "nf_conntrack.expect_hashsize" should not
> longer exist if nf_conntrack is non-modular.

Ok, that makes sense, I've added your patch to the queue to go into the
next release with this original patch.

thanks,

greg k-h

[patch 05/13] HOWTO: update ja_JP/HOWTO with latest changes

[Greg KH]

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #1: howto-update-ja_jp-howto-with-latest-changes.patch --]
[-- Type: text/plain; charset=unknown-8bit, Size: 17768 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Tsugikazu Shibata <tshibata@ab.jp.nec.co>

patch 3b6662f192fc521b9657f63e68d20ec99979dae6 upstream.

Here is another sync patch of Documentation/ja_JP/HOWTO

Japanese developer sent me some cosmetic changes and also follow
changes of HOWTO
    Cross reference URL (sosdg.org/qiyong/lxr)
    known_regression explanations on kernel dev. process

Signed-off-by: Tsugikazu Shibata <tshibata@ab.jp.nec.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 Documentation/ja_JP/HOWTO |   84 ++++++++++++++++++++++++----------------------
 1 file changed, 45 insertions(+), 39 deletions(-)

--- a/Documentation/ja_JP/HOWTO
+++ b/Documentation/ja_JP/HOWTO
@@ -1,4 +1,4 @@
-NOTE:
+NOTE:
 This is a version of Documentation/HOWTO translated into Japanese.
 This document is maintained by Tsugikazu Shibata <tshibata@ab.jp.nec.com>
 and the JF Project team <www.linux.or.jp/JF>.
@@ -11,14 +11,14 @@ for non English (read: Japanese) speaker
 fork. So if you have any comments or updates for this file, please try
 to update the original English file first.
 
-Last Updated: 2007/07/18
+Last Updated: 2007/09/23
 ==================================
 これは、
-linux-2.6.22/Documentation/HOWTO
+linux-2.6.23/Documentation/HOWTO
 の和訳です。
 
 翻訳団体： JF プロジェクト < http://www.linux.or.jp/JF/ >
-翻訳日： 2007/07/16
+翻訳日： 2007/09/19
 翻訳者： Tsugikazu Shibata <tshibata at ab dot jp dot nec dot com>
 校正者： 松倉さん <nbh--mats at nifty dot com>
          小林 雅典さん (Masanori Kobayasi) <zap03216 at nifty dot ne dot jp>
@@ -27,6 +27,7 @@ linux-2.6.22/Documentation/HOWTO
          野口さん (Kenji Noguchi) <tokyo246 at gmail dot com>
          河内さん (Takayoshi Kochi) <t-kochi at bq dot jp dot nec dot com>
          岩本さん (iwamoto) <iwamoto.kn at ncos dot nec dot co dot jp>
+         内田さん (Satoshi Uchida) <s-uchida at ap dot jp dot nec dot com>
 ==================================
 
 Linux カーネル開発のやり方
@@ -40,7 +41,7 @@ Linux カーネル開発コミュニテã
 手助けになります。
 
 もし、このドキュメントのどこかが古くなっていた場合には、このドキュメン
-トの最後にリストしたメンテナーにパッチを送ってください。
+トの最後にリストしたメンテナにパッチを送ってください。
 
 はじめに
 ---------
@@ -59,7 +60,7 @@ Linux カーネル開発コミュニテã
 ネル開発者には必要です。アーキテクチャ向けの低レベル部分の開発をするの
 でなければ、(どんなアーキテクチャでも)アセンブリ(訳注: 言語)は必要あり
 ません。以下の本は、C 言語の十分な知識や何年もの経験に取って代わるもの
-ではありませんが、少なくともリファレンスとしてはいい本です。
+ではありませんが、少なくともリファレンスとしては良い本です。
  - "The C Programming Language" by Kernighan and Ritchie [Prentice Hall]
  -『プログラミング言語Ｃ第2版』(B.W. カーニハン/D.M. リッチー著 石田晴久訳) [共立出版]
  - "Practical C Programming" by Steve Oualline [O'Reilly]
@@ -76,7 +77,7 @@ Linux カーネル開発コミュニテã
 ときどき、カーネルがツールチェインや C 言語拡張に置いている前提がどう
 なっているのかわかりにくいことがあり、また、残念なことに決定的なリファ
 レンスは存在しません。情報を得るには、gcc の info ページ( info gcc )を
-みてください。
+見てください。
 
 あなたは既存の開発コミュニティと一緒に作業する方法を学ぼうとしているこ
 とに留意してください。そのコミュニティは、コーディング、スタイル、
@@ -92,7 +93,7 @@ Linux カーネル開発コミュニテã
 
 Linux カーネルのソースコードは GPL ライセンスの下でリリースされていま
 す。ライセンスの詳細については、ソースツリーのメインディレクトリに存在
-する、COPYING のファイルをみてください。もしライセンスについてさらに質
+する、COPYING のファイルを見てください。もしライセンスについてさらに質
 問があれば、Linux Kernel メーリングリストに質問するのではなく、どうぞ
 法律家に相談してください。メーリングリストの人達は法律家ではなく、法的
 問題については彼らの声明はあてにするべきではありません。
@@ -109,7 +110,8 @@ Linux カーネルソースツリーはå
 新しいドキュメントファイルも追加することを勧めます。
 カーネルの変更が、カーネルがユーザ空間に公開しているインターフェイスの
 変更を引き起こす場合、その変更を説明するマニュアルページのパッチや情報
-をマニュアルページのメンテナ mtk-manpages@gmx.net に送ることを勧めます。
+をマニュアルページのメンテナ mtk-manpages@gmx.net に送ることを勧めま
+す。
 
 以下はカーネルソースツリーに含まれている読んでおくべきファイルの一覧で
 す-
@@ -117,7 +119,7 @@ Linux カーネルソースツリーはå
   README
     このファイルは Linuxカーネルの簡単な背景とカーネルを設定(訳注
     configure )し、生成(訳注 build )するために必要なことは何かが書かれ
-    ています。カーネルに関して初めての人はここからスタートするとよいで
+    ています。カーネルに関して初めての人はここからスタートすると良いで
     しょう。
 
   Documentation/Changes
@@ -128,7 +130,7 @@ Linux カーネルソースツリーはå
   Documentation/CodingStyle
     これは Linux カーネルのコーディングスタイルと背景にある理由を記述
     しています。全ての新しいコードはこのドキュメントにあるガイドライン
-    に従っていることを期待されています。大部分のメンテナーはこれらのルー
+    に従っていることを期待されています。大部分のメンテナはこれらのルー
     ルに従っているものだけを受け付け、多くの人は正しいスタイルのコード
     だけをレビューします。
 
@@ -168,16 +170,16 @@ Linux カーネルソースツリーはå
     支援してください。
 
   Documentation/ManagementStyle
-    このドキュメントは Linux カーネルのメンテナー達がどう行動するか、
+    このドキュメントは Linux カーネルのメンテナ達がどう行動するか、
     彼らの手法の背景にある共有されている精神について記述しています。こ
     れはカーネル開発の初心者なら（もしくは、単に興味があるだけの人でも）
-    重要です。なぜならこのドキュメントは、カーネルメンテナー達の独特な
+    重要です。なぜならこのドキュメントは、カーネルメンテナ達の独特な
     行動についての多くの誤解や混乱を解消するからです。
 
   Documentation/stable_kernel_rules.txt
     このファイルはどのように stable カーネルのリリースが行われるかのルー
     ルが記述されています。そしてこれらのリリースの中のどこかで変更を取
-    り入れてもらいたい場合に何をすればいいかが示されています。
+    り入れてもらいたい場合に何をすれば良いかが示されています。
 
   Documentation/kernel-docs.txt
 　　カーネル開発に付随する外部ドキュメントのリストです。もしあなたが
@@ -218,9 +220,9 @@ web サイトには、コードの構成
 ここには、また、カーネルのコンパイルのやり方やパッチの当て方などの間接
 的な基本情報も記述されています。
 
-あなたがどこからスタートしてよいかわからないが、Linux カーネル開発コミュ
+あなたがどこからスタートして良いかわからないが、Linux カーネル開発コミュ
 ニティに参加して何かすることをさがしている場合には、Linux kernel
-Janitor's プロジェクトにいけばよいでしょう -
+Janitor's プロジェクトにいけば良いでしょう -
 	http://janitor.kernelnewbies.org/
 ここはそのようなスタートをするのにうってつけの場所です。ここには、
 Linux カーネルソースツリーの中に含まれる、きれいにし、修正しなければな
@@ -243,7 +245,7 @@ Linux カーネルソースツリーのä
 自己参照方式で、索引がついた web 形式で、ソースコードを参照することが
 できます。この最新の素晴しいカーネルコードのリポジトリは以下で見つかり
 ます-
-	http://sosdg.org/~coywolf/lxr/
+	http://sosdg.org/~qiyong/lxr/
 
 開発プロセス
 -----------------------
@@ -265,9 +267,9 @@ Linux カーネルの開発プロセスã
 以下のとおり-
 
   - 新しいカーネルがリリースされた直後に、2週間の特別期間が設けられ、
-    この期間中に、メンテナー達は Linus に大きな差分を送ることができま
-    す。このような差分は通常 -mm カーネルに数週間含まれてきたパッチで
-    す。 大きな変更は git(カーネルのソース管理ツール、詳細は
+    この期間中に、メンテナ達は Linus に大きな差分を送ることができます。
+    このような差分は通常 -mm カーネルに数週間含まれてきたパッチです。
+    大きな変更は git(カーネルのソース管理ツール、詳細は
     http://git.or.cz/  参照) を使って送るのが好ましいやり方ですが、パッ
     チファイルの形式のまま送るのでも十分です。
 
@@ -285,6 +287,10 @@ Linux カーネルの開発プロセスã
     に安定した状態にあると判断したときにリリースされます。目標は毎週新
     しい -rc カーネルをリリースすることです。
 
+   - 以下の URL で各 -rc リリースに存在する既知の後戻り問題のリスト
+     が追跡されます-
+     http://kernelnewbies.org/known_regressions
+
   - このプロセスはカーネルが 「準備ができた」と考えられるまで継続しま
     す。このプロセスはだいたい 6週間継続します。
 
@@ -331,8 +337,8 @@ Andrew は個別のサブシステムカ
 linux-kernel メーリングリストで収集された多数のパッチと同時に一つにま
 とめます。
 このツリーは新機能とパッチが検証される場となります。ある期間の間パッチ
-が -mm に入って価値を証明されたら、Andrew やサブシステムメンテナが、メ
-インラインへ入れるように Linus にプッシュします。
+が -mm に入って価値を証明されたら、Andrew やサブシステムメンテナが、
+メインラインへ入れるように Linus にプッシュします。
 
 メインカーネルツリーに含めるために Linus に送る前に、すべての新しいパッ
 チが -mm ツリーでテストされることが強く推奨されます。
@@ -460,7 +466,7 @@ MAINTAINERS ファイルにリストがã
 せん-
 彼らはあなたのパッチの行毎にコメントを入れたいので、そのためにはそうす
 るしかありません。あなたのメールプログラムが空白やタブを圧縮しないよう
-に確認した方がいいです。最初の良いテストとしては、自分にメールを送って
+に確認した方が良いです。最初の良いテストとしては、自分にメールを送って
 みて、そのパッチを自分で当ててみることです。もしそれがうまく行かないな
 ら、あなたのメールプログラムを直してもらうか、正しく動くように変えるべ
 きです。
@@ -507,14 +513,14 @@ MAINTAINERS ファイルにリストがã
 とも普通のことです。これはあなたのパッチが受け入れられないということで
 は *ありません*、そしてあなた自身に反対することを意味するのでも *ありま
 せん*。単に自分のパッチに対して指摘された問題を全て修正して再送すれば
-いいのです。
+良いのです。
 
 
 カーネルコミュニティと企業組織のちがい
 -----------------------------------------------------------------
 
 カーネルコミュニティは大部分の伝統的な会社の開発環境とは異ったやり方で
-動いています。以下は問題を避けるためにできるとよいことののリストです-
+動いています。以下は問題を避けるためにできると良いことのリストです-
 
   あなたの提案する変更について言うときのうまい言い方：
 
@@ -525,7 +531,7 @@ MAINTAINERS ファイルにリストがã
     - "以下は一連の小さなパッチ群ですが..."
     - "これは典型的なマシンでの性能を向上させます.."
 
-  やめた方がいい悪い言い方：
+  やめた方が良い悪い言い方：
 
     - このやり方で AIX/ptx/Solaris ではできたので、できるはずだ
     - 私はこれを20年もの間やってきた、だから
@@ -575,10 +581,10 @@ Linux カーネルコミュニティはã
 
 1) 小さいパッチはあなたのパッチが適用される見込みを大きくします、カー
    ネルの人達はパッチが正しいかどうかを確認する時間や労力をかけないか
-   らです。5行のパッチはメンテナがたった1秒見るだけで適用できます。し
-   かし、500行のパッチは、正しいことをレビューするのに数時間かかるかも
-   しれません(時間はパッチのサイズなどにより指数関数に比例してかかりま
-   す)
+   らです。5行のパッチはメンテナがたった1秒見るだけで適用できます。
+   しかし、500行のパッチは、正しいことをレビューするのに数時間かかるか
+   もしれません(時間はパッチのサイズなどにより指数関数に比例してかかり
+   ます)
 
    小さいパッチは何かあったときにデバッグもとても簡単になります。パッ
    チを1個1個取り除くのは、とても大きなパッチを当てた後に(かつ、何かお
@@ -587,23 +593,23 @@ Linux カーネルコミュニティはã
 2) 小さいパッチを送るだけでなく、送るまえに、書き直して、シンプルにす
    る(もしくは、単に順番を変えるだけでも)ことも、とても重要です。
 
-以下はカーネル開発者の Al Viro のたとえ話しです：
+以下はカーネル開発者の Al Viro のたとえ話です：
 
         "生徒の数学の宿題を採点する先生のことを考えてみてください、先
-        生は生徒が解に到達するまでの試行錯誤をみたいとは思わないでしょ
-        う。先生は簡潔な最高の解をみたいのです。良い生徒はこれを知って
+        生は生徒が解に到達するまでの試行錯誤を見たいとは思わないでしょ
+        う。先生は簡潔な最高の解を見たいのです。良い生徒はこれを知って
         おり、そして最終解の前の中間作業を提出することは決してないので
         す"
 
-        カーネル開発でもこれは同じです。メンテナー達とレビューア達は、
-        問題を解決する解の背後になる思考プロセスをみたいとは思いません。
-        彼らは単純であざやかな解決方法をみたいのです。
+        カーネル開発でもこれは同じです。メンテナ達とレビューア達は、
+        問題を解決する解の背後になる思考プロセスを見たいとは思いません。
+        彼らは単純であざやかな解決方法を見たいのです。
 
 あざやかな解を説明するのと、コミュニティと共に仕事をし、未解決の仕事を
 議論することのバランスをキープするのは難しいかもしれません。
 ですから、開発プロセスの早期段階で改善のためのフィードバックをもらうよ
-うにするのもいいですが、変更点を小さい部分に分割して全体ではまだ完成し
-ていない仕事を(部分的に)取り込んでもらえるようにすることもいいことです。
+うにするのも良いですが、変更点を小さい部分に分割して全体ではまだ完成し
+ていない仕事を(部分的に)取り込んでもらえるようにすることも良いことです。
 
 また、でき上がっていないものや、"将来直す" ようなパッチを、本流に含め
 てもらうように送っても、それは受け付けられないことを理解してください。
@@ -629,7 +635,7 @@ Linux カーネルコミュニティはã
   - テスト結果
 
 これについて全てがどのようにあるべきかについての詳細は、以下のドキュメ
-ントの ChangeLog セクションをみてください-
+ントの ChangeLog セクションを見てください-
   "The Perfect Patch"
       http://www.zip.com.au/~akpm/linux/patches/stuff/tpp.txt
 

-- 

[patch 06/13] SLUB: Fix memory leak by not reusing cpu_slab

[Greg KH]

[-- Attachment #1: slub-fix-memory-leak-by-not-reusing-cpu_slab.patch --]
[-- Type: text/plain, Size: 1907 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Christoph Lameter <clameter@sgi.com>

patch 05aa345034de6ae9c77fb93f6a796013641d57d5 in mainline.

SLUB: Fix memory leak by not reusing cpu_slab

Fix the memory leak that may occur when we attempt to reuse a cpu_slab
that was allocated while we reenabled interrupts in order to be able to
grow a slab cache. The per cpu freelist may contain objects and in that
situation we may overwrite the per cpu freelist pointer loosing objects.
This only occurs if we find that the concurrently allocated slab fits
our allocation needs.

If we simply always deactivate the slab then the freelist will be properly
reintegrated and the memory leak will go away.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 mm/slub.c |   22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1501,28 +1501,8 @@ new_slab:
 	page = new_slab(s, gfpflags, node);
 	if (page) {
 		cpu = smp_processor_id();
-		if (s->cpu_slab[cpu]) {
-			/*
-			 * Someone else populated the cpu_slab while we
-			 * enabled interrupts, or we have gotten scheduled
-			 * on another cpu. The page may not be on the
-			 * requested node even if __GFP_THISNODE was
-			 * specified. So we need to recheck.
-			 */
-			if (node == -1 ||
-				page_to_nid(s->cpu_slab[cpu]) == node) {
-				/*
-				 * Current cpuslab is acceptable and we
-				 * want the current one since its cache hot
-				 */
-				discard_slab(s, page);
-				page = s->cpu_slab[cpu];
-				slab_lock(page);
-				goto load_freelist;
-			}
-			/* New slab does not fit our expectations */
+		if (s->cpu_slab[cpu])
 			flush_slab(s, s->cpu_slab[cpu], cpu);
-		}
 		slab_lock(page);
 		SetSlabFrozen(page);
 		s->cpu_slab[cpu] = page;

-- 

[patch 07/13] writeback: dont propagate AOP_WRITEPAGE_ACTIVATE

[Greg KH]

[-- Attachment #1: writeback-don-t-propagate-aop_writepage_activate.patch --]
[-- Type: text/plain, Size: 945 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Andrew Morton <akpm@linux-foundation.org>

patch e423003028183df54f039dfda8b58c49e78c89d7 in mainline.

This is a writeback-internal marker but we're propagating it all the way back
to userspace!.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>


---
 mm/page-writeback.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -672,8 +672,10 @@ retry:
 
 			ret = (*writepage)(page, wbc, data);
 
-			if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE))
+			if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) {
 				unlock_page(page);
+				ret = 0;
+			}
 			if (ret || (--(wbc->nr_to_write) <= 0))
 				done = 1;
 			if (wbc->nonblocking && bdi_write_congested(bdi)) {

-- 

[patch 08/13] splice: fix double kunmap() in vmsplice copy path

[Greg KH]

[-- Attachment #1: splice-fix-double-kunmap-in-vmsplice-copy-path.patch --]
[-- Type: text/plain, Size: 2371 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Jens Axboe <jens.axboe@oracle.com>

patch 6866bef40d06f7c2baac3a855b1917a8ca75456c in mainline.

The out label should not include the unmap, the only way to jump
there already has unmapped the source.

00002000
       f7c21a00 00000000 00000000 c0489036 00018e32 00000002 00000000
00001000
Call Trace:
 [<c0487dd9>] pipe_to_user+0xca/0xd3
 [<c0488233>] __splice_from_pipe+0x53/0x1bd
 [<c0454947>] ------------[ cut here ]------------
filemap_fault+0x221/0x380
 [<c0487d0f>] pipe_to_user+0x0/0xd3
 [<c0489036>] sys_vmsplice+0x3b7/0x422
 [<c045ec3f>] kernel BUG at mm/highmem.c:206!
handle_mm_fault+0x4d5/0x8eb
 [<c041ed5b>] kmap_atomic+0x1c/0x20
 [<c045d33d>] unmap_vmas+0x3d1/0x584
 [<c045f717>] free_pgtables+0x90/0xa0
 [<c041d84b>] pgd_dtor+0x0/0x1
 [<c044d665>] audit_syscall_exit+0x2aa/0x2c6
 [<c0407817>] do_syscall_trace+0x124/0x169
 [<c0404df2>] syscall_call+0x7/0xb
 =======================
Code: 2d 00 d0 5b 00 25 00 00 e0 ff 29 invalid opcode: 0000 [#1]
c2 89 d0 c1 e8 0c 8b 14 85 a0 6c 7c c0 4a 85 d2 89 14 85 a0 6c 7c c0 74 07
31 c9 4a 75 15 eb 04 <0f> 0b eb fe 31 c9 81 3d 78 38 6d c0 78 38 6d c0 0f
95 c1 b0 01
EIP: [<c045bbc3>] kunmap_high+0x51/0x8e SS:ESP 0068:f5960df0
SMP
Modules linked in: netconsole autofs4 hidp nfs lockd nfs_acl rfcomm l2cap
bluetooth sunrpc ipv6 ib_iser rdma_cm ib_cm iw_cmib_sa ib_mad ib_core
ib_addr iscsi_tcp libiscsi scsi_transport_iscsi dm_mirror dm_multipath
dm_mod video output sbs batteryac parport_pc lp parport sg i2c_piix4
i2c_core floppy cfi_probe gen_probe scb2_flash mtd chipreg tg3 e1000 button
ide_cd serio_raw cdrom aic7xxx scsi_transport_spi sd_mod scsi_mod ext3 jbd
ehci_hcd ohci_hcd uhci_hcd
CPU:    3
EIP:    0060:[<c045bbc3>]    Not tainted VLI
EFLAGS: 00010246   (2.6.23 #1)
EIP is at kunmap_high+0x51/0x8e

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 fs/splice.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1390,10 +1390,10 @@ static int pipe_to_user(struct pipe_inod
 	if (copy_to_user(sd->u.userptr, src + buf->offset, sd->len))
 		ret = -EFAULT;
 
+	buf->ops->unmap(pipe, buf, src);
 out:
 	if (ret > 0)
 		sd->u.userptr += ret;
-	buf->ops->unmap(pipe, buf, src);
 	return ret;
 }
 

-- 

[patch 09/13] fix the softlockup watchdog to actually work

[Greg KH]

[-- Attachment #1: fix-the-softlockup-watchdog-to-actually-work.patch --]
[-- Type: text/plain, Size: 1671 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Ingo Molnar <mingo@elte.hu>

patch a115d5caca1a2905ba7a32b408a6042b20179aaa in mainline.

this Xen related commit:

   commit 966812dc98e6a7fcdf759cbfa0efab77500a8868
   Author: Jeremy Fitzhardinge <jeremy@goop.org>
   Date:   Tue May 8 00:28:02 2007 -0700

       Ignore stolen time in the softlockup watchdog

broke the softlockup watchdog to never report any lockups. (!)

print_timestamp defaults to 0, this makes the following condition
always true:

	if (print_timestamp < (touch_timestamp + 1) ||

and we'll in essence never report soft lockups.

apparently the functionality of the soft lockup watchdog was never
actually tested with that patch applied ...

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 kernel/softlockup.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/kernel/softlockup.c
+++ b/kernel/softlockup.c
@@ -80,10 +80,11 @@ void softlockup_tick(void)
 	print_timestamp = per_cpu(print_timestamp, this_cpu);
 
 	/* report at most once a second */
-	if (print_timestamp < (touch_timestamp + 1) ||
-		did_panic ||
-			!per_cpu(watchdog_task, this_cpu))
+	if ((print_timestamp >= touch_timestamp &&
+			print_timestamp < (touch_timestamp + 1)) ||
+			did_panic || !per_cpu(watchdog_task, this_cpu)) {
 		return;
+	}
 
 	/* do not print during early bootup: */
 	if (unlikely(system_state != SYSTEM_RUNNING)) {

-- 

[patch 10/13] sched: keep utime/stime monotonic

[Greg KH]

[-- Attachment #1: sched-keep-utime-stime-monotonic.patch --]
[-- Type: text/plain, Size: 2337 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Frans Pop <elendil@planet.nl>

sched: keep utime/stime monotonic

cpustats use utime/stime as a ratio against sum_exec_runtime, as a
consequence it can happen - when the ratio changes faster than time
accumulates - that either can be appear to go backwards.

Combined backport for 2.6.23 of the following patches from mainline:
commit 73a2bcb0edb9ffb0b007b3546b430e2c6e415eee
Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
  sched: keep utime/stime monotonic

commit 9301899be75b464ef097f0b5af7af6d9bd8f68a7
Author: Balbir Singh <balbir@linux.vnet.ibm.com>
  sched: fix /proc/<PID>/stat stime/utime monotonicity, part 2

Signed-off-by: Frans Pop <elendil@planet.nl>
CC: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Balbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 fs/proc/array.c       |    6 ++++--
 include/linux/sched.h |    1 +
 kernel/fork.c         |    2 ++
 3 files changed, 7 insertions(+), 2 deletions(-)

--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -351,7 +351,8 @@ static cputime_t task_utime(struct task_
 	}
 	utime = (clock_t)temp;
 
-	return clock_t_to_cputime(utime);
+	p->prev_utime = max(p->prev_utime, clock_t_to_cputime(utime));
+	return p->prev_utime;
 }
 
 static cputime_t task_stime(struct task_struct *p)
@@ -366,7 +367,8 @@ static cputime_t task_stime(struct task_
 	stime = nsec_to_clock_t(p->se.sum_exec_runtime) -
 			cputime_to_clock_t(task_utime(p));
 
-	return clock_t_to_cputime(stime);
+	p->prev_stime = max(p->prev_stime, clock_t_to_cputime(stime));
+	return p->prev_stime;
 }
 #endif
 
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1022,6 +1022,7 @@ struct task_struct {
 
 	unsigned int rt_priority;
 	cputime_t utime, stime;
+	cputime_t prev_utime, prev_stime;
 	unsigned long nvcsw, nivcsw; /* context switch counts */
 	struct timespec start_time; 		/* monotonic time */
 	struct timespec real_start_time;	/* boot based time */
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1045,6 +1045,8 @@ static struct task_struct *copy_process(
 
 	p->utime = cputime_zero;
 	p->stime = cputime_zero;
+	p->prev_utime = cputime_zero;
+	p->prev_stime = cputime_zero;
 
 #ifdef CONFIG_TASK_XACCT
 	p->rchar = 0;		/* I/O counter: bytes read */

-- 

[patch 11/13] Fix compat futex hangs.

[Greg KH]

[-- Attachment #1: fix-compat-futex-hangs.patch --]
[-- Type: text/plain, Size: 3259 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: David Miller <davem@davemloft.net>

[FUTEX]: Fix address computation in compat code.

[ Upstream commit: 3c5fd9c77d609b51c0bab682c9d40cbb496ec6f1 ]

compat_exit_robust_list() computes a pointer to the
futex entry in userspace as follows:

	(void __user *)entry + futex_offset

'entry' is a 'struct robust_list __user *', and
'futex_offset' is a 'compat_long_t' (typically a 's32').

Things explode if the 32-bit sign bit is set in futex_offset.

Type promotion sign extends futex_offset to a 64-bit value before
adding it to 'entry'.

This triggered a problem on sparc64 running 32-bit applications which
would lock up a cpu looping forever in the fault handling for the
userspace load in handle_futex_death().

Compat userspace runs with address masking (wherein the cpu zeros out
the top 32-bits of every effective address given to a memory operation
instruction) so the sparc64 fault handler accounts for this by
zero'ing out the top 32-bits of the fault address too.

Since the kernel properly uses the compat_uptr interfaces, kernel side
accesses to compat userspace work too since they will only use
addresses with the top 32-bit clear.

Because of this compat futex layer bug we get into the following loop
when executing the get_user() load near the top of handle_futex_death():

1) load from address '0xfffffffff7f16bd8', FAULT
2) fault handler clears upper 32-bits, processes fault
   for address '0xf7f16bd8' which succeeds
3) goto #1

I want to thank Bernd Zeimetz, Josip Rodin, and Fabio Massimo Di Nitto
for their tireless efforts helping me track down this bug.

Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 kernel/futex_compat.c |   27 ++++++++++++++++++++-------
 1 file changed, 20 insertions(+), 7 deletions(-)

--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -29,6 +29,15 @@ fetch_robust_entry(compat_uptr_t *uentry
 	return 0;
 }
 
+static void __user *futex_uaddr(struct robust_list *entry,
+				compat_long_t futex_offset)
+{
+	compat_uptr_t base = ptr_to_compat(entry);
+	void __user *uaddr = compat_ptr(base + futex_offset);
+
+	return uaddr;
+}
+
 /*
  * Walk curr->robust_list (very carefully, it's a userspace list!)
  * and mark any locks found there dead, and notify any waiters.
@@ -75,11 +84,13 @@ void compat_exit_robust_list(struct task
 		 * A pending lock might already be on the list, so
 		 * dont process it twice:
 		 */
-		if (entry != pending)
-			if (handle_futex_death((void __user *)entry + futex_offset,
-						curr, pi))
-				return;
+		if (entry != pending) {
+			void __user *uaddr = futex_uaddr(entry,
+							 futex_offset);
 
+			if (handle_futex_death(uaddr, curr, pi))
+				return;
+		}
 		if (rc)
 			return;
 		uentry = next_uentry;
@@ -93,9 +104,11 @@ void compat_exit_robust_list(struct task
 
 		cond_resched();
 	}
-	if (pending)
-		handle_futex_death((void __user *)pending + futex_offset,
-				   curr, pip);
+	if (pending) {
+		void __user *uaddr = futex_uaddr(pending, futex_offset);
+
+		handle_futex_death(uaddr, curr, pip);
+	}
 }
 
 asmlinkage long

-- 

[patch 12/13] fix tmpfs BUG and AOP_WRITEPAGE_ACTIVATE

[Greg KH]

[-- Attachment #1: fix-tmpfs-bug-and-aop_writepage_activate.patch --]
[-- Type: text/plain, Size: 2545 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Hugh Dickins <hugh@veritas.com>

patch 487e9bf25cbae11b131d6a14bdbb3a6a77380837 in mainline.

It's possible to provoke unionfs (not yet in mainline, though in mm and
some distros) to hit shmem_writepage's BUG_ON(page_mapped(page)).  I expect
it's possible to provoke the 2.6.23 ecryptfs in the same way (but the
2.6.24 ecryptfs no longer calls lower level's ->writepage).

This came to light with the recent find that AOP_WRITEPAGE_ACTIVATE could
leak from tmpfs via write_cache_pages and unionfs to userspace.  There's
already a fix (e423003028183df54f039dfda8b58c49e78c89d7 - writeback: don't
propagate AOP_WRITEPAGE_ACTIVATE) in the tree for that, and it's okay so
far as it goes; but insufficient because it doesn't address the underlying
issue, that shmem_writepage expects to be called only by vmscan (relying on
backing_dev_info capabilities to prevent the normal writeback path from
ever approaching it).

That's an increasingly fragile assumption, and ramdisk_writepage (the other
source of AOP_WRITEPAGE_ACTIVATEs) is already careful to check
wbc->for_reclaim before returning it.  Make the same check in
shmem_writepage, thereby sidestepping the page_mapped BUG also.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Cc: Erez Zadok <ezk@cs.sunysb.edu>
Reviewed-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 mm/shmem.c |   15 +++++++++++++++
 1 file changed, 15 insertions(+)

--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -916,6 +916,21 @@ static int shmem_writepage(struct page *
 	struct inode *inode;
 
 	BUG_ON(!PageLocked(page));
+	/*
+	 * shmem_backing_dev_info's capabilities prevent regular writeback or
+	 * sync from ever calling shmem_writepage; but a stacking filesystem
+	 * may use the ->writepage of its underlying filesystem, in which case
+	 * we want to do nothing when that underlying filesystem is tmpfs
+	 * (writing out to swap is useful as a response to memory pressure, but
+	 * of no use to stabilize the data) - just redirty the page, unlock it
+	 * and claim success in this case.  AOP_WRITEPAGE_ACTIVATE, and the
+	 * page_mapped check below, must be avoided unless we're in reclaim.
+	 */
+	if (!wbc->for_reclaim) {
+		set_page_dirty(page);
+		unlock_page(page);
+		return 0;
+	}
 	BUG_ON(page_mapped(page));
 
 	mapping = page->mapping;

-- 

[patch 13/13] BLOCK: Fix bad sharing of tag busy list on queues with shared tag maps

[Greg KH]

[-- Attachment #1: block-fix-bad-sharing-of-tag-busy-list-on-queues-with-shared-tag-maps.patch --]
[-- Type: text/plain, Size: 3261 bytes --]

-stable review patch.  If anyone has any objections, please let us know.

------------------
From: Jens Axboe <jens.axboe@oracle.com>

patch 6eca9004dfcb274a502438a591df5b197690afb1 in mainline.

For the locking to work, only the tag map and tag bit map may be shared
(incidentally, I was just explaining this to Nick yesterday, but I
apparently didn't review the code well enough myself). But we also share
the busy list!  The busy_list must be queue private, or we need a
block_queue_tag covering lock as well.

So we have to move the busy_list to the queue. This'll work fine, and
it'll actually also fix a problem with blk_queue_invalidate_tags() which
will invalidate tags across all shared queues. This is a bit confusing,
the low level driver should call it for each queue seperately since
otherwise you cannot kill tags on just a single queue for eg a hard
drive that stops responding. Since the function has no callers
currently, it's not an issue.

This is fixed with commit 6eca9004dfcb274a502438a591df5b197690afb1 in
Linus' tree.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 block/ll_rw_blk.c      |    8 +++-----
 include/linux/blkdev.h |    2 +-
 2 files changed, 4 insertions(+), 6 deletions(-)

--- a/block/ll_rw_blk.c
+++ b/block/ll_rw_blk.c
@@ -819,7 +819,6 @@ static int __blk_free_tags(struct blk_qu
 	retval = atomic_dec_and_test(&bqt->refcnt);
 	if (retval) {
 		BUG_ON(bqt->busy);
-		BUG_ON(!list_empty(&bqt->busy_list));
 
 		kfree(bqt->tag_index);
 		bqt->tag_index = NULL;
@@ -931,7 +930,6 @@ static struct blk_queue_tag *__blk_queue
 	if (init_tag_map(q, tags, depth))
 		goto fail;
 
-	INIT_LIST_HEAD(&tags->busy_list);
 	tags->busy = 0;
 	atomic_set(&tags->refcnt, 1);
 	return tags;
@@ -982,6 +980,7 @@ int blk_queue_init_tags(struct request_q
 	 */
 	q->queue_tags = tags;
 	q->queue_flags |= (1 << QUEUE_FLAG_QUEUED);
+	INIT_LIST_HEAD(&q->tag_busy_list);
 	return 0;
 fail:
 	kfree(tags);
@@ -1152,7 +1151,7 @@ int blk_queue_start_tag(struct request_q
 	rq->tag = tag;
 	bqt->tag_index[tag] = rq;
 	blkdev_dequeue_request(rq);
-	list_add(&rq->queuelist, &bqt->busy_list);
+	list_add(&rq->queuelist, &q->tag_busy_list);
 	bqt->busy++;
 	return 0;
 }
@@ -1173,11 +1172,10 @@ EXPORT_SYMBOL(blk_queue_start_tag);
  **/
 void blk_queue_invalidate_tags(struct request_queue *q)
 {
-	struct blk_queue_tag *bqt = q->queue_tags;
 	struct list_head *tmp, *n;
 	struct request *rq;
 
-	list_for_each_safe(tmp, n, &bqt->busy_list) {
+	list_for_each_safe(tmp, n, &q->tag_busy_list) {
 		rq = list_entry_rq(tmp);
 
 		if (rq->tag == -1) {
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -356,7 +356,6 @@ enum blk_queue_state {
 struct blk_queue_tag {
 	struct request **tag_index;	/* map of busy tags */
 	unsigned long *tag_map;		/* bit map of free/busy tags */
-	struct list_head busy_list;	/* fifo list of busy tags */
 	int busy;			/* current depth */
 	int max_depth;			/* what we will send to device */
 	int real_max_depth;		/* what the array can hold */
@@ -451,6 +450,7 @@ struct request_queue
 	unsigned int		dma_alignment;
 
 	struct blk_queue_tag	*queue_tags;
+	struct list_head	tag_busy_list;
 
 	unsigned int		nr_sorted;
 	unsigned int		in_flight;

--