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linux/drivers/xen
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Mojiong Qiu f5a93eaffa xen/events: fix RCU warning, or Call idle notifier after irq_enter() 
commit 772aebcefe upstream.

exit_idle() should be called after irq_enter(), otherwise it throws:

[ INFO: suspicious RCU usage. ]
3.6.5 #1 Not tainted
-------------------------------
include/linux/rcupdate.h:725 rcu_read_lock() used illegally while idle!

other info that might help us debug this:

RCU used illegally from idle CPU!
rcu_scheduler_active = 1, debug_locks = 1
RCU used illegally from extended quiescent state!
1 lock held by swapper/0/0:
 #0:  (rcu_read_lock){......}, at: [<ffffffff810e9fe0>] __atomic_notifier_call_chain+0x0/0x140

stack backtrace:
Pid: 0, comm: swapper/0 Not tainted 3.6.5 #1
Call Trace:
 <IRQ>  [<ffffffff811259a2>] lockdep_rcu_suspicious+0xe2/0x130
 [<ffffffff810ea10c>] __atomic_notifier_call_chain+0x12c/0x140
 [<ffffffff810e9fe0>] ? atomic_notifier_chain_unregister+0x90/0x90
 [<ffffffff811216cd>] ? trace_hardirqs_off+0xd/0x10
 [<ffffffff810ea136>] atomic_notifier_call_chain+0x16/0x20
 [<ffffffff810777c3>] exit_idle+0x43/0x50
 [<ffffffff81568865>] xen_evtchn_do_upcall+0x25/0x50
 [<ffffffff81aa690e>] xen_do_hypervisor_callback+0x1e/0x30
 <EOI>  [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000
 [<ffffffff810013aa>] ? hypercall_page+0x3aa/0x1000
 [<ffffffff81061540>] ? xen_safe_halt+0x10/0x20
 [<ffffffff81075cfa>] ? default_idle+0xba/0x570
 [<ffffffff810778af>] ? cpu_idle+0xdf/0x140
 [<ffffffff81a4d881>] ? rest_init+0x135/0x144
 [<ffffffff81a4d74c>] ? csum_partial_copy_generic+0x16c/0x16c
 [<ffffffff82520c45>] ? start_kernel+0x3db/0x3e8
 [<ffffffff8252066a>] ? repair_env_string+0x5a/0x5a
 [<ffffffff82520356>] ? x86_64_start_reservations+0x131/0x135
 [<ffffffff82524aca>] ? xen_start_kernel+0x465/0x46

Git commit 98ad1cc14a
Author: Frederic Weisbecker <fweisbec@gmail.com>
Date:   Fri Oct 7 18:22:09 2011 +0200

    x86: Call idle notifier after irq_enter()

did this, but it missed the Xen code.

Signed-off-by: Mojiong Qiu <mjqiu@tencent.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-26 11:37:47 -08:00
..
xen-pciback xen/pciback: Fix proper FLR steps. 2012-09-14 10:00:33 -07:00
xenbus xen/xenbus: Add quirk to deal with misconfigured backends. 2012-04-19 12:45:01 -04:00
xenfs xen: Add xenbus device driver 2011-12-16 13:29:39 -05:00
balloon.c xen/balloon: Avoid OOM when requesting highmem 2011-11-16 12:13:43 -05:00
biomerge.c xen: using EXPORT_SYMBOL requires including export.h 2012-01-18 15:37:49 -08:00
cpu_hotplug.c xen/bootup: During bootup suppress XENBUS: Unable to read cpu state 2012-02-03 16:05:30 -05:00
events.c xen/events: fix RCU warning, or Call idle notifier after irq_enter() 2012-11-26 11:37:47 -08:00
evtchn.c xen/event: Add reference counting to event channels 2011-11-21 17:14:48 -05:00
features.c xen: clean up asm/xen/hypervisor.h 2008-12-16 21:50:31 +01:00
gntalloc.c xen-gntalloc: introduce missing kfree 2012-01-03 13:39:04 -05:00
gntdev.c xen/gntdev: don't leak memory from IOCTL_GNTDEV_MAP_GRANT_REF 2012-11-17 13:15:54 -08:00
grant-table.c xen/m2p: do not reuse kmap_op->dev_bus_addr 2012-10-02 10:30:06 -07:00
Kconfig xen/Kconfig: fix Kconfig layout 2012-05-07 12:26:28 -04:00
Makefile xen/acpi-processor: C and P-state driver that uploads said data to hypervisor. 2012-03-14 12:35:42 -04:00
manage.c xen/resume: Fix compile warnings. 2012-04-19 15:12:49 -04:00
pci.c Merge branch 'stable/cleanups-3.2' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen 2011-11-06 20:13:34 -08:00
platform-pci.c xen: initialize platform-pci even if xen_emul_unplug=never 2012-03-22 11:37:11 -04:00
privcmd.c xen/privcmd: Remove unused support for arch specific privcmp mmap 2011-12-16 13:29:42 -05:00
privcmd.h xen: Add privcmd device driver 2011-12-16 13:29:31 -05:00
swiotlb-xen.c xen: Use correct masking in xen_swiotlb_alloc_coherent. 2012-09-14 10:00:33 -07:00
sys-hypervisor.c xen: constify all instances of "struct attribute_group" 2012-03-14 12:34:19 -04:00
tmem.c One tiny feature that accidentally got lost in the initial git pull: 2012-03-24 12:20:25 -07:00
xen-acpi-processor.c xen/acpi: Workaround broken BIOSes exporting non-existing C-states. 2012-04-26 22:07:28 -04:00
xen-balloon.c Features: 2012-03-22 20:16:14 -07:00
xen-selfballoon.c xen: constify all instances of "struct attribute_group" 2012-03-14 12:34:19 -04:00
xencomm.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00