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85b7059169
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Xiao Guangrong 85b7059169 KVM: MMU: fix shrinking page from the empty mmu 
Fix:

 [ 3190.059226] BUG: unable to handle kernel NULL pointer dereference at           (null)
 [ 3190.062224] IP: [<ffffffffa02aac66>] mmu_page_zap_pte+0x10/0xa7 [kvm]
 [ 3190.063760] PGD 104f50067 PUD 112bea067 PMD 0
 [ 3190.065309] Oops: 0000 [#1] SMP DEBUG_PAGEALLOC
 [ 3190.066860] CPU 1
[ ...... ]
 [ 3190.109629] Call Trace:
 [ 3190.111342]  [<ffffffffa02aada6>] kvm_mmu_prepare_zap_page+0xa9/0x1fc [kvm]
 [ 3190.113091]  [<ffffffffa02ab2f5>] mmu_shrink+0x11f/0x1f3 [kvm]
 [ 3190.114844]  [<ffffffffa02ab25d>] ? mmu_shrink+0x87/0x1f3 [kvm]
 [ 3190.116598]  [<ffffffff81150c9d>] ? prune_super+0x142/0x154
 [ 3190.118333]  [<ffffffff8110a4f4>] ? shrink_slab+0x39/0x31e
 [ 3190.120043]  [<ffffffff8110a687>] shrink_slab+0x1cc/0x31e
 [ 3190.121718]  [<ffffffff8110ca1d>] do_try_to_free_pages

This is caused by shrinking page from the empty mmu, although we have
checked n_used_mmu_pages, it is useless since the check is out of mmu-lock

Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2012-07-03 17:31:50 -03:00
..
alpha Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-06-01 11:53:44 -07:00
arm Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm 2012-07-01 11:02:25 -07:00
avr32 fixups for signal breakage 2012-06-04 17:47:34 -04:00
blackfin Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2012-06-05 09:47:15 -07:00
c6x new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
cris Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-06-01 11:53:44 -07:00
frv frv: Remove bogus closing parenthesis 2012-06-02 10:38:19 -04:00
h8300 h8300: use the declarations provided by <asm/sections.h> 2012-06-20 14:39:35 -07:00
hexagon new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
ia64 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-06-01 11:53:44 -07:00
m32r Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-06-01 11:53:44 -07:00
m68k m68knommu: define a local devm_clk_get() function 2012-06-25 09:17:20 +10:00
microblaze new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
mips - More robust parsing especially of xattr data in JFFS2 2012-06-01 16:55:42 -07:00
mn10300 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-06-01 11:53:44 -07:00
openrisc new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
parisc [PARISC] fix code to find libgcc 2012-06-05 14:10:23 +09:00
powerpc powerpc/pseries: Fix software invalidate TCE 2012-06-29 14:35:37 +10:00
s390 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal 2012-06-01 11:53:44 -07:00
score new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
sh Merge branches 'sh/urgent' and 'sh/trivial' into sh-fixes-for-linus 2012-06-28 16:46:13 +09:00
sparc Fix typo in printed messages 2012-06-24 11:03:52 -07:00
tile tile: fix bug in get_user() for 4-byte values 2012-06-16 16:56:13 -04:00
um new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
unicore32 new helper: signal_delivered() 2012-06-01 12:58:52 -04:00
x86 KVM: MMU: fix shrinking page from the empty mmu 2012-07-03 17:31:50 -03:00
xtensa xtensa: use the declarations provided by <asm/sections.h> 2012-06-20 14:39:35 -07:00
.gitignore
Kconfig Merge branch 'for-linus' of git://git.linaro.org/people/mszyprowski/linux-dma-mapping 2012-05-25 09:18:59 -07:00