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	net: filter: Just In Time compiler for x86-64	2011-04-27 23:05:08 -07:00
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	net: filter: Just In Time compiler for x86-64	2011-04-27 23:05:08 -07:00
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	x86, cpu: Move AMD Elan Kconfig under "Processor family"	2011-04-08 13:01:25 -07:00
Makefile.um	um: take arch/um/sys-x86 to arch/x86/um	2011-11-02 14:15:05 +01:00