Jan Kara b5bd6a0e5f lib/flex_proportions.c: fix corruption of denominator in flexible proportions ... When racing with CPU hotplug, percpu_counter_sum() can return negative values for the number of observed events. This confuses fprop_new_period(), which uses unsigned type and as a result number of events is set to big *positive* number. From that moment on, things go pear shaped and can result e.g. in division by zero as denominator is later truncated to 32-bits. This bug causes a divide-by-zero oops in bdi_dirty_limit() in Borislav's 3.6.0-rc6 based kernel. Fix the issue by using a signed type in fprop_new_period(). That makes us bail out from the function without doing anything (mistakenly) thinking there are no events to age. That makes aging somewhat inaccurate but getting accurate data would be rather hard. Signed-off-by: Jan Kara <jack@suse.cz> Reported-by: Borislav Petkov <bp@amd64.org> Reported-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: Wu Fengguang <fengguang.wu@intel.com> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: <stable@vger.kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2012-09-25 08:59:21 -07:00
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lzo	…
mpi	Remove unused code from MPI library	2012-05-26 11:51:03 +10:00
raid6	lib/raid6: fix sparse warnings in recovery functions	2012-05-28 14:10:22 +10:00
reed_solomon	…
xz	…
zlib_deflate	…
zlib_inflate	…
.gitignore	…
Kconfig	Merge branch 'akpm' (Andrew's patch-bomb)	2012-07-30 17:25:34 -07:00
Kconfig.debug	powerpc: pSeries reconfig notifier error injection module	2012-07-30 17:25:22 -07:00
Kconfig.kgdb	…
Kconfig.kmemcheck	…
Makefile	Use time based periods to age the writeback proportions,	2012-07-30 22:14:04 -07:00
argv_split.c	…
atomic64.c	…
atomic64_test.c	atomic64_test: simplify the #ifdef for atomic64_dec_if_positive() test	2012-07-30 17:25:16 -07:00
audit.c	…
average.c	…
bcd.c	…
bch.c	…
bitmap.c	lib/bitmap.c: fix documentation for scnprintf() functions	2012-05-29 16:22:32 -07:00
bitrev.c	…
bsearch.c	…
btree.c	btree: catch NULL value before it does harm	2012-06-07 14:43:55 -07:00
bug.c	…
bust_spinlocks.c	…
check_signature.c	…
checksum.c	…
clz_tab.c	…
cmdline.c	…
cordic.c	…
cpu-notifier-error-inject.c	cpu: rewrite cpu-notifier-error-inject module	2012-07-30 17:25:22 -07:00
cpu_rmap.c	…
cpumask.c	…
crc-ccitt.c	…
crc-itu-t.c	…
crc-t10dif.c	…
crc7.c	…
crc8.c	…
crc16.c	…
crc32.c	lib/crc32.c: fix unused variables warnings	2012-07-30 17:25:17 -07:00
crc32defs.h	…
ctype.c	…
debug_locks.c	…
debugobjects.c	…
dec_and_lock.c	…
decompress.c	…
decompress_bunzip2.c	…
decompress_inflate.c	…
decompress_unlzma.c	…
decompress_unlzo.c	…
decompress_unxz.c	…
devres.c	…
digsig.c	digsig: add hash size comparision on signature verification	2012-09-13 09:13:02 +08:00
div64.c	lib: correct link to the original source for div64_u64	2012-06-28 11:51:39 +02:00
dma-debug.c	dma-debug: debugfs_create_bool() takes a u32 pointer	2012-07-02 12:11:40 +02:00
dump_stack.c	…
dynamic_debug.c	…
dynamic_queue_limits.c	bql: Avoid possible inconsistent calculation.	2012-05-31 18:18:17 -04:00
extable.c	…
fault-inject.c	fault-inject: avoid call to random32() if fault injection is disabled	2012-06-20 14:39:36 -07:00
fdt.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
fdt_ro.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
fdt_rw.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
fdt_strerror.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
fdt_sw.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
fdt_wip.c	of/lib: Allow scripts/dtc/libfdt to be used from kernel code	2012-07-23 13:54:52 +01:00
find_last_bit.c	…
find_next_bit.c	…
flex_array.c	…
flex_proportions.c	lib/flex_proportions.c: fix corruption of denominator in flexible proportions	2012-09-25 08:59:21 -07:00
gcd.c	…
gen_crc32table.c	…
genalloc.c	…
halfmd4.c	…
hexdump.c	…
hweight.c	…
idr.c	…
inflate.c	…
int_sqrt.c	…
iomap.c	…
iomap_copy.c	…
iommu-helper.c	…
ioremap.c	…
irq_regs.c	…
is_single_threaded.c	…
jedec_ddr_data.c	…
kasprintf.c	…
klist.c	…
kobject.c	…
kobject_uevent.c	netlink: add netlink_kernel_cfg parameter to netlink_kernel_create	2012-06-29 16:46:02 -07:00
kstrtox.c	…
kstrtox.h	…
lcm.c	…
libcrc32c.c	…
list_debug.c	rcu: Fix broken strings in RCU's source code.	2012-07-06 06:01:49 -07:00
list_sort.c	…
llist.c	…
locking-selftest-hardirq.h	…
locking-selftest-mutex.h	…
locking-selftest-rlock-hardirq.h	…
locking-selftest-rlock-softirq.h	…
locking-selftest-rlock.h	…
locking-selftest-rsem.h	…
locking-selftest-softirq.h	…
locking-selftest-spin-hardirq.h	…
locking-selftest-spin-softirq.h	…
locking-selftest-spin.h	…
locking-selftest-wlock-hardirq.h	…
locking-selftest-wlock-softirq.h	…
locking-selftest-wlock.h	…
locking-selftest-wsem.h	…
locking-selftest.c	…
lru_cache.c	…
md5.c	…
memory-notifier-error-inject.c	memory: memory notifier error injection module	2012-07-30 17:25:22 -07:00
memweight.c	string: introduce memweight()	2012-07-30 17:25:16 -07:00
nlattr.c	…
notifier-error-inject.c	fault-injection: notifier error injection	2012-07-30 17:25:22 -07:00
notifier-error-inject.h	fault-injection: notifier error injection	2012-07-30 17:25:22 -07:00
pSeries-reconfig-notifier-error-inject.c	powerpc: pSeries reconfig notifier error injection module	2012-07-30 17:25:22 -07:00
parser.c	…
pci_iomap.c	…
percpu_counter.c	switch the protection of percpu_counter list to spinlock	2012-07-31 09:28:31 +04:00
plist.c	…
pm-notifier-error-inject.c	PM: PM notifier error injection module	2012-07-30 17:25:22 -07:00
prio_heap.c	…
prio_tree.c	…
proportions.c	…
radix-tree.c	radix-tree: fix contiguous iterator	2012-06-05 10:46:40 -07:00
random32.c	…
ratelimit.c	…
rational.c	…
rbtree.c	…
reciprocal_div.c	…
rwsem-spinlock.c	…
rwsem.c	…
scatterlist.c	Merge branch 'akpm' (Andrew's patch-bomb)	2012-07-30 17:25:34 -07:00
sha1.c	…
show_mem.c	…
smp_processor_id.c	…
sort.c	…
spinlock_debug.c	spinlock_debug: print offset in addition to symbol name	2012-07-30 17:25:16 -07:00
stmp_device.c	…
string.c	…
string_helpers.c	lib/string_helpers.c: make arrays static	2012-05-29 16:22:32 -07:00
strncpy_from_user.c	word-at-a-time: make the interfaces truly generic	2012-05-26 11:33:40 -07:00
strnlen_user.c	lib: Fix generic strnlen_user for 32-bit big-endian machines	2012-05-27 20:59:46 -07:00
swiotlb.c	swiotlb: print physical addresses consistently with other parts of kernel	2012-05-29 16:22:21 -07:00
syscall.c	…
test-kstrtox.c	lib/test-kstrtox.c: mark const init data with __initconst instead of __initdata	2012-05-29 16:22:32 -07:00
textsearch.c	…
timerqueue.c	…
ts_bm.c	…
ts_fsm.c	…
ts_kmp.c	…
uuid.c	…
vsprintf.c	vsprintf: add support of '%*ph[CDN]'	2012-07-30 17:25:14 -07:00