Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: john stultz <johnstul@us.ibm.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Let's make immediately obvious from where sysctl comes from and messages
itself more noticeable.
Signed-off-by: NAlexey Dobriyan <adobriyan@gmail.com>
Acked-by: N"Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

The following functions can now become static again:
- get_futex_key()
- get_futex_key_refs()
- drop_futex_key_refs()
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>

Add some missing cond_syscall() entries for this case.
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

Do not allow processes to clear their TIF_SIGPENDING if TIF_FREEZE is set,
so that they will not race with the freezer (like mysqld does, for example).
Signed-off-by: NRafael J. Wysocki <rjw@sisk.pl>
Acked-by: NNigel Cunningham <nigel@suspend2.net>
Acked-by: NPavel Machek <pavel@ucw.cz>
Cc: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Extend Peter's patch to fix accounting issues, by keeping stime
monotonic too.
Signed-off-by: NBalbir Singh <balbir@linux.vnet.ibm.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>
Tested-by: NFrans Pop <elendil@planet.nl>

fallout of recent commits: small coding style fixes.
Signed-off-by: NIngo Molnar <mingo@elte.hu>

fix style of swap() macro in kernel/sched_fair.c.

( this macro should eventually move to a general header, as ext3 uses
  a similar construct too. )
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Adds a cpu.usage file to the CFS cgroup that reports CPU usage in
milliseconds for that cgroup's tasks

[ mingo@elte.hu: style cleanups. ]
Signed-off-by: NPaul Menage <menage@google.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Peter Zijlstra noticed that the rcu_head object need not be present
in every cfs_rq of a group. Move it to the task_group structure
instead.
Signed-off-by: NSrivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

This patch:

commit 9b5b7751
Author: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Date:   Mon Oct 15 17:00:09 2007 +0200

    sched: clean up code under CONFIG_FAIR_GROUP_SCHED

Introduced an assumption of the existence of CPU0 via this line

cfs_rq = tg->cfs_rq[0];

If you have no CPU0, that will be NULL.  The fix seems to be just to
take whatever cfs_rq queue comes out of the for_each_possible_cpu()
loop, since they're all equally good for the destruction operation.
Signed-off-by: NJames Bottomley <James.Bottomley@SteelEye.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

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.
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

account_guest_time() can become static.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Don't undef __i386__/__x86_64__ in uml anymore, make sure that (few) places
that required adjusting the ifdefs got those.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Change the hrtimer printk "Switched to high resolution mode .." to
be KERN_DEBUG, rather than KERN_INFO. If users need to see this they
can pass "loglevel" or "debug" on the command line, or check dmesg.
Signed-off-by: NMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

 kernel/hrtimer.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

This makes sure printk format strings contain no more than a single
line.
Signed-off-by: NVegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

This patch removes the unused 
EXPORT_SYMBOL_GPL(tick_nohz_get_sleep_length).
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>

Fix a typo in the __lock_acquire comment.
Signed-off-by: NGautham R Shenoy <ego@in.ibm.com>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

This patch removes the unused
EXPORT_SYMBOL_GPL(tick_nohz_get_sleep_length),
which we no long user b/c we no longer build optional modules.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Acked-by: NVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Acked-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NLen Brown <len.brown@intel.com>

Lockdep noticed that this lock can also be taken from hardirq context, and can
thus not unconditionally disable/enable irqs.

 WARNING: at kernel/lockdep.c:2033 trace_hardirqs_on()
  [show_trace_log_lvl+26/48] show_trace_log_lvl+0x1a/0x30
  [show_trace+18/32] show_trace+0x12/0x20
  [dump_stack+22/32] dump_stack+0x16/0x20
  [trace_hardirqs_on+405/416] trace_hardirqs_on+0x195/0x1a0
  [_read_unlock_irq+34/48] _read_unlock_irq+0x22/0x30
  [sched_debug_show+2615/4224] sched_debug_show+0xa37/0x1080
  [show_state_filter+326/368] show_state_filter+0x146/0x170
  [sysrq_handle_showstate+10/16] sysrq_handle_showstate+0xa/0x10
  [__handle_sysrq+123/288] __handle_sysrq+0x7b/0x120
  [handle_sysrq+40/64] handle_sysrq+0x28/0x40
  [kbd_event+1045/1680] kbd_event+0x415/0x690
  [input_pass_event+206/208] input_pass_event+0xce/0xd0
  [input_handle_event+170/928] input_handle_event+0xaa/0x3a0
  [input_event+95/112] input_event+0x5f/0x70
  [atkbd_interrupt+434/1456] atkbd_interrupt+0x1b2/0x5b0
  [serio_interrupt+59/128] serio_interrupt+0x3b/0x80
  [i8042_interrupt+263/576] i8042_interrupt+0x107/0x240
  [handle_IRQ_event+40/96] handle_IRQ_event+0x28/0x60
  [handle_edge_irq+175/320] handle_edge_irq+0xaf/0x140
  [do_IRQ+64/128] do_IRQ+0x40/0x80
  [common_interrupt+46/52] common_interrupt+0x2e/0x34
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

At the moment, a lot of load balancing code that is irrelevant to non
SMP systems gets included during non SMP builds.

This patch addresses this issue and reduces the binary size on non
SMP systems:

   text    data     bss     dec     hex filename
  10983      28    1192   12203    2fab sched.o.before
  10739      28    1192   11959    2eb7 sched.o.after
Signed-off-by: NPeter Williams <pwil3058@bigpond.net.au>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

At the moment, balance_tasks() provides low level functionality for both
  move_tasks() and move_one_task() (indirectly) via the load_balance()
function (in the sched_class interface) which also provides dual
functionality.  This dual functionality complicates the interfaces and
internal mechanisms and makes the run time overhead of operations that
are called with two run queue locks held.

This patch addresses this issue and reduces the overhead of these
operations.
Signed-off-by: NPeter Williams <pwil3058@bigpond.net.au>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

cpu_shares_{show,store}() can become static.
Signed-off-by: NAdrian Bunk <bunk@kernel.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

- replace "cont" with "cgrp" in a few places in the CFS cgroup code, 
- use write_uint rather than write for cpu.shares write function
Signed-off-by: NPaul Menage <menage@google.com>
Acked-by : Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

profile=sleep only works if CONFIG_SCHEDSTATS is set. This patch notes
the limitation in Documentation/kernel-parameters.txt and prints a
warning at boot-time if profile=sleep is used without CONFIG_SCHEDSTAT.
Signed-off-by: NMel Gorman <mel@csn.ul.ie>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

A full register dump along with stack backtrace would make the
"scheduling while atomic" message more helpful. Use show_regs() instead
of dump_stack() for this. We already know we're atomic in here (that is
why this function was called) so show_regs()'s atomicity expectations
are guaranteed.

Also, modify the output of the "BUG: scheduling while atomic:" header a
bit to keep task->comm and task->pid together and preempt_count() after
them.
Signed-off-by: NSatyam Sharma <satyam@infradead.org>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

clean up sched_domain_debug().

this also shrinks the code a bit:

   text    data     bss     dec     hex filename
  50474    4306     480   55260    d7dc sched.o.before
  50404    4306     480   55190    d796 sched.o.after
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Jeff Dike noticed that wait_for_completion_interruptible()'s prototype
had a mismatched fastcall.

Fix this by removing the fastcall attributes from all the completion APIs.
Found-by: NJeff Dike <jdike@linux.intel.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

commit  029190c5 (cpuset
sched_load_balance flag) was not tested SCHED_DEBUG enabled as
committed as it dereferences NULL when used and it reordered
the sysctl registration to cause it to never show any domains
or their tunables.

Fixes:

1) restore arch_init_sched_domains ordering
	we can't walk the domains before we build them

	presently we register cpus with empty directories (no domain
	directories or files).

2) make unregister_sched_domain_sysctl do nothing when already unregistered
	detach_destroy_domains is now called one set of cpus at a time
	unregister_syctl dereferences NULL if called with a null.

	While the the function would always dereference null if called
	twice, in the previous code it was always called once and then
	was followed a register.  So only the hidden bug of the
	sysctl_root_table not being allocated followed by an attempt to
	free it would have shown the error.

3) always call unregister and register in partition_sched_domains
	The code is "smart" about unregistering only needed domains.
	Since we aren't guaranteed any calls to unregister, always 
	unregister.   Without calling register on the way out we
	will not have a table or any sysctl tree.

4) warn if register is called without unregistering
	The previous table memory is lost, leaving pointers to the
	later freed memory in sysctl and leaking the memory of the
	tables.

Before this patch on a 2-core 4-thread box compiled for SMT and NUMA,
the domains appear empty (there are actually 3 levels per cpu).  And as
soon as two domains a null pointer is dereferenced (unreliable in this
case is stack garbage):

bu19a:~# ls -R /proc/sys/kernel/sched_domain/
/proc/sys/kernel/sched_domain/:
cpu0  cpu1  cpu2  cpu3

/proc/sys/kernel/sched_domain/cpu0:

/proc/sys/kernel/sched_domain/cpu1:

/proc/sys/kernel/sched_domain/cpu2:

/proc/sys/kernel/sched_domain/cpu3:

bu19a:~# mkdir /dev/cpuset
bu19a:~# mount -tcpuset cpuset /dev/cpuset/
bu19a:~# cd /dev/cpuset/
bu19a:/dev/cpuset# echo 0 > sched_load_balance 
bu19a:/dev/cpuset# mkdir one
bu19a:/dev/cpuset# echo 1 > one/cpus               
bu19a:/dev/cpuset# echo 0 > one/sched_load_balance 
Unable to handle kernel paging request for data at address 0x00000018
Faulting instruction address: 0xc00000000006b608
NIP: c00000000006b608 LR: c00000000006b604 CTR: 0000000000000000
REGS: c000000018d973f0 TRAP: 0300   Not tainted  (2.6.23-bml)
MSR: 9000000000009032 <EE,ME,IR,DR>  CR: 28242442  XER: 00000000
DAR: 0000000000000018, DSISR: 0000000040000000
TASK = c00000001912e340[1987] 'bash' THREAD: c000000018d94000 CPU: 2
..
NIP [c00000000006b608] .unregister_sysctl_table+0x38/0x110
LR [c00000000006b604] .unregister_sysctl_table+0x34/0x110
Call Trace:
[c000000018d97670] [c000000007017270] 0xc000000007017270 (unreliable)
[c000000018d97720] [c000000000058710] .detach_destroy_domains+0x30/0xb0
[c000000018d977b0] [c00000000005cf1c] .partition_sched_domains+0x1bc/0x230
[c000000018d97870] [c00000000009fdc4] .rebuild_sched_domains+0xb4/0x4c0
[c000000018d97970] [c0000000000a02e8] .update_flag+0x118/0x170
[c000000018d97a80] [c0000000000a1768] .cpuset_common_file_write+0x568/0x820
[c000000018d97c00] [c00000000009d95c] .cgroup_file_write+0x7c/0x180
[c000000018d97cf0] [c0000000000e76b8] .vfs_write+0xe8/0x1b0
[c000000018d97d90] [c0000000000e810c] .sys_write+0x4c/0x90
[c000000018d97e30] [c00000000000852c] syscall_exit+0x0/0x40
Signed-off-by: NMilton Miller <miltonm@bga.com>
Signed-off-by: NIngo Molnar <mingo@elte.hu>

Signed-off-by: NJeff Garzik <jgarzik@redhat.com>

As it is some callers of synchronize_irq rely on memory barriers
to provide synchronisation against the IRQ handlers.  For example,
the tg3 driver does

	tp->irq_sync = 1;
	smp_mb();
	synchronize_irq();

and then in the IRQ handler:

	if (!tp->irq_sync)
		netif_rx_schedule(dev, &tp->napi);

Unfortunately memory barriers only work well when they come in
pairs.  Because we don't actually have memory barriers on the
IRQ path, the memory barrier before the synchronize_irq() doesn't
actually protect us.

In particular, synchronize_irq() may return followed by the
result of netif_rx_schedule being made visible.

This patch (mostly written by Linus) fixes this by using spin
locks instead of memory barries on the synchronize_irq() path.
Signed-off-by: NHerbert Xu <herbert@gondor.apana.org.au>
Acked-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Fix kernel-doc for auditsc parameter changes.

Warning(linux-2.6.23-git17//kernel/auditsc.c:1623): No description found for parameter 'dentry'
Warning(linux-2.6.23-git17//kernel/auditsc.c:1666): No description found for parameter 'dentry'
Signed-off-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Gabriel C reported that modprobing appletalk on current git gives a
warning in dmesg :

   "sysctl table check failed: /net/appletalk .3.7 procname does not match binary path procname"

Oops.  My apologies it appears I made a mistake when creating my table
to check up on sysctl values.
Signed-off-by: N"Eric W. Biederman" <ebiederm@xmission.com>
Tested-by: NGabriel C <nix.or.die@googlemail.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

KVM clears it by itself now, and for s390 this is plain wrong.
Signed-off-by: NLaurent Vivier <Laurent.Vivier@bull.net>
Acked-by: NIngo Molnar <mingo@elte.hu>
Signed-off-by: NAvi Kivity <avi@qumranet.com>

New kind of audit rule predicates: "object is visible in given subtree".
The part that can be sanely implemented, that is.  Limitations:
	* if you have hardlink from outside of tree, you'd better watch
it too (or just watch the object itself, obviously)
	* if you mount something under a watched tree, tell audit
that new chunk should be added to watched subtrees
	* if you umount something in a watched tree and it's still mounted
elsewhere, you will get matches on events happening there.  New command
tells audit to recalculate the trees, trimming such sources of false
positives.

Note that it's _not_ about path - if something mounted in several places
(multiple mount, bindings, different namespaces, etc.), the match does
_not_ depend on which one we are using for access.
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

makes caller simpler *and* allows to scan ancestors
Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

Weird I thought I had written the makefile so this would be handled.  Oh
well this should fix it.

Sorry about that.
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
Acked-and-tested-by: NRandy Dunlap <randy.dunlap@oracle.com>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

Change the loop style of copy_data_pages() to remove a duplicate condition.
Signed-off-by: NFengguang Wu <wfg@mail.ustc.edu.cn>
Acked-by: NRafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: NAdrian Bunk <bunk@kernel.org>

Signed-off-by: NUwe Kleine-König <ukleinek@informatik.uni-freiburg.de>
Signed-off-by: NAdrian Bunk <bunk@kernel.org>

hardirq_offset is no longer needed.
Signed-off-by: NMichael Neuling <mikey@neuling.org>
Signed-off-by: NAdrian Bunk <bunk@kernel.org>