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e37e112de3
linux/arch/x86
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Frederic Weisbecker e37e112de3 x86: Enter rcu extended qs after idle notifier call 
The idle notifier, called by enter_idle(), enters into rcu read
side critical section but at that time we already switched into
the RCU-idle window (rcu_idle_enter() has been called). And it's
illegal to use rcu_read_lock() in that state.

This results in rcu reporting its bad mood:

[    1.275635] WARNING: at include/linux/rcupdate.h:194 __atomic_notifier_call_chain+0xd2/0x110()
[    1.275635] Hardware name: AMD690VM-FMH
[    1.275635] Modules linked in:
[    1.275635] Pid: 0, comm: swapper Not tainted 3.0.0-rc6+ #252
[    1.275635] Call Trace:
[    1.275635]  [<ffffffff81051c8a>] warn_slowpath_common+0x7a/0xb0
[    1.275635]  [<ffffffff81051cd5>] warn_slowpath_null+0x15/0x20
[    1.275635]  [<ffffffff817d6f22>] __atomic_notifier_call_chain+0xd2/0x110
[    1.275635]  [<ffffffff817d6f71>] atomic_notifier_call_chain+0x11/0x20
[    1.275635]  [<ffffffff810018a0>] enter_idle+0x20/0x30
[    1.275635]  [<ffffffff81001995>] cpu_idle+0xa5/0x110
[    1.275635]  [<ffffffff817a7465>] rest_init+0xe5/0x140
[    1.275635]  [<ffffffff817a73c8>] ? rest_init+0x48/0x140
[    1.275635]  [<ffffffff81cc5ca3>] start_kernel+0x3d1/0x3dc
[    1.275635]  [<ffffffff81cc5321>] x86_64_start_reservations+0x131/0x135
[    1.275635]  [<ffffffff81cc5412>] x86_64_start_kernel+0xed/0xf4
[    1.275635] ---[ end trace a22d306b065d4a66 ]---

Fix this by entering rcu extended quiescent state later, just before
the CPU goes to sleep.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
2011-12-11 10:31:37 -08:00
..
boot doc: fix broken references 2011-09-27 18:08:04 +02:00
configs iommu: Rename the DMAR and INTR_REMAP config options 2011-09-21 10:22:03 +02:00
crypto Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
ia32 Cross Memory Attach 2011-10-31 17:30:44 -07:00
include/asm x86, efi: Calling __pa() with an ioremap()ed address is invalid 2011-12-09 08:32:26 +01:00
kernel x86: Enter rcu extended qs after idle notifier call 2011-12-11 10:31:37 -08:00
kvm KVM: VMX: Check for automatic switch msr table overflow 2011-11-17 16:28:09 +02:00
lguest lguest: add export.h to lguest files for THIS_MODULE/EXPORT_SYMBOL 2011-10-31 19:32:13 -04:00
lib x86: Fix insn decoder for longer instruction 2011-10-10 09:05:51 +02:00
math-emu
mm thp: add compound tail page _mapcount when mapped 2011-12-09 07:50:28 -08:00
net
oprofile Merge branch 'urgent' of git://amd64.org/linux/rric into perf/urgent 2011-11-15 11:03:30 +01:00
pci x86: Fix files explicitly requiring export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:30:35 -04:00
platform x86, efi: Calling __pa() with an ioremap()ed address is invalid 2011-12-09 08:32:26 +01:00
power x86: Fix files explicitly requiring export.h for EXPORT_SYMBOL/THIS_MODULE 2011-10-31 19:30:35 -04:00
tools
um fix braino in um patchset (mea culpa) 2011-11-21 12:10:21 -08:00
vdso Merge branch 'x86-cpu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2011-10-28 05:03:12 -07:00
video x86: fix up files really needing to include module.h 2011-10-31 19:30:36 -04:00
xen xen/pm_idle: Make pm_idle be default_idle under Xen. 2011-12-03 10:49:58 -08:00
.gitignore
Kbuild
Kconfig x86/intel_mid: Kconfig select fix 2011-12-06 14:40:50 +01:00
Kconfig.cpu x86: Add support for cmpxchg_double 2011-06-25 12:17:32 -07:00
Kconfig.debug doc: fix broken references 2011-09-27 18:08:04 +02:00
Makefile
Makefile_32.cpu
Makefile.um um: take arch/um/sys-x86 to arch/x86/um 2011-11-02 14:15:05 +01:00