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
..
lzo	lib: add support for LZO-compressed kernels	2010-01-11 09:34:04 -08:00
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	XZ: Fix incorrect XZ_BUF_ERROR	2011-09-21 13:39:59 -07:00
zlib_deflate	zlib: slim down zlib_deflate() workspace when possible	2011-03-22 17:44:17 -07:00
zlib_inflate	inflate_fast: sout is already a short so ptr arith was off by one.	2010-03-12 15:52:44 -08:00
.gitignore
argv_split.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
atomic64_test.c	atomic64_test: simplify the #ifdef for atomic64_dec_if_positive() test	2012-07-30 17:25:16 -07:00
atomic64.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
audit.c	audit: support the "standard" <asm-generic/unistd.h>	2011-05-04 14:41:28 -04:00
average.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
bcd.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
bch.c	lib: add shared BCH ECC library	2011-03-11 14:25:50 +00:00
bitmap.c	lib/bitmap.c: fix documentation for scnprintf() functions	2012-05-29 16:22:32 -07:00
bitrev.c
bsearch.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
btree.c	btree: catch NULL value before it does harm	2012-06-07 14:43:55 -07:00
bug.c	bugs, x86: Fix printk levels for panic, softlockups and stack dumps	2012-01-26 21:28:45 +01:00
bust_spinlocks.c
check_signature.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
checksum.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
clz_tab.c	lib: Fix multiple definitions of clz_tab	2012-02-02 10:34:23 +11:00
cmdline.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
cordic.c	Docs: wording: functions -> algorithm	2011-10-29 21:20:22 +02:00
cpu_rmap.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
cpu-notifier-error-inject.c	cpu: rewrite cpu-notifier-error-inject module	2012-07-30 17:25:22 -07:00
cpumask.c	lib/cpumask.c: remove __any_online_cpu()	2012-03-28 17:14:35 -07:00
crc7.c
crc8.c	lib: crc8: add new library module providing crc8 algorithm	2011-06-03 15:01:06 -04:00
crc16.c
crc32.c	lib/crc32.c: fix unused variables warnings	2012-07-30 17:25:17 -07:00
crc32defs.h	crc32: select an algorithm via Kconfig	2012-03-23 16:58:38 -07:00
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
ctype.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
debug_locks.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
debugobjects.c	debugobjects: Fill_pool() returns void now	2012-04-18 13:38:48 +02:00
dec_and_lock.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
decompress_bunzip2.c	decompress_bunzip2: remove invalid vi modeline	2011-12-06 10:00:05 +01:00
decompress_inflate.c	decompressors: check input size in decompress_inflate.c	2011-01-13 08:03:25 -08:00
decompress_unlzma.c	treewide: Fix comment and string typo 'bufer'	2011-12-06 09:53:40 +01:00
decompress_unlzo.c	unlzo: fix input buffer free	2012-01-12 20:13:13 -08:00
decompress_unxz.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
decompress.c	decompressors: add boot-time XZ support	2011-01-13 08:03:25 -08:00
devres.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
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	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
dynamic_debug.c	Revert "dynamic_debug: remove unneeded includes"	2012-05-07 16:47:32 -07:00
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_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
fdt.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	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
find_next_bit.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
flex_array.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
flex_proportions.c	lib/flex_proportions.c: fix corruption of denominator in flexible proportions	2012-09-25 08:59:21 -07:00
gcd.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
gen_crc32table.c	crc32: bolt on crc32c	2012-03-23 16:58:38 -07:00
genalloc.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
halfmd4.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
hexdump.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
hweight.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
idr.c	The following text was taken from the original review request:	2012-03-24 10:24:31 -07:00
inflate.c	MN10300: Don't try and #include <linux/slab.h> in lib/inflate.c from bootloader	2010-08-12 09:51:35 -07:00
int_sqrt.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
iomap_copy.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
iomap.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
iommu-helper.c	The following text was taken from the original review request:	2012-03-24 10:24:31 -07:00
ioremap.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
irq_regs.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
is_single_threaded.c
jedec_ddr_data.c	ddr: add LPDDR2 data from JESD209-2	2012-05-02 00:04:06 -07:00
kasprintf.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
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	mips,kgdb: kdb low level trap catch and stack trace	2010-05-20 21:04:26 -05:00
Kconfig.kmemcheck
klist.c	Revert "driver core: check start node in klist_iter_init_node"	2012-04-19 19:17:30 -07:00
kobject_uevent.c	netlink: add netlink_kernel_cfg parameter to netlink_kernel_create	2012-06-29 16:46:02 -07:00
kobject.c	kobject: fix the uncorrect comment	2012-05-07 16:51:19 -07:00
kstrtox.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
kstrtox.h	lib/kstrtox: common code between kstrto*() and simple_strto*() functions	2011-10-31 17:30:56 -07:00
lcm.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
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	lib/list_sort: test: check element addresses	2010-10-26 16:52:19 -07:00
llist.c	Disintegrate and delete asm/system.h	2012-03-28 15:58:21 -07:00
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	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
lru_cache.c	lru_cache: use correct type in sizeof for allocation	2011-05-25 08:39:52 -07:00
Makefile	Use time based periods to age the writeback proportions,	2012-07-30 22:14:04 -07:00
md5.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
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	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
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
parser.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
pci_iomap.c	lib: add NO_GENERIC_PCI_IOPORT_MAP	2012-01-31 23:19:47 +02:00
percpu_counter.c	switch the protection of percpu_counter list to spinlock	2012-07-31 09:28:31 +04:00
plist.c	bug.h: add include of it to various implicit C users	2012-02-29 17:15:08 -05:00
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	prio_tree: introduce prio_set_parent()	2012-03-23 16:58:36 -07:00
proportions.c	locking, lib/proportions: Annotate prop_local_percpu::lock as raw	2011-09-13 11:11:50 +02:00
pSeries-reconfig-notifier-error-inject.c	powerpc: pSeries reconfig notifier error injection module	2012-07-30 17:25:22 -07:00
radix-tree.c	radix-tree: fix contiguous iterator	2012-06-05 10:46:40 -07:00
random32.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
ratelimit.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
rational.c	lib: Change mail address of Oskar Schirmer	2012-05-17 15:18:37 +02:00
rbtree.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
reciprocal_div.c	sch_red: Adaptative RED AQM	2011-12-08 19:52:43 -05:00
rwsem-spinlock.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
rwsem.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
scatterlist.c	Merge branch 'akpm' (Andrew's patch-bomb)	2012-07-30 17:25:34 -07:00
sha1.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
show_mem.c	arch, mm: filter disallowed nodes from arch specific show_mem functions	2011-05-25 08:39:03 -07:00
smp_processor_id.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
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	lib: add support for stmp-style devices	2012-04-20 23:27:08 +02:00
string_helpers.c	lib/string_helpers.c: make arrays static	2012-05-29 16:22:32 -07:00
string.c	The following text was taken from the original review request:	2012-03-24 10:24:31 -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	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
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	textsearch: doc - fix spelling in lib/textsearch.c.	2011-01-24 23:33:30 -08:00
timerqueue.c	The following text was taken from the original review request:	2012-03-24 10:24:31 -07:00
ts_bm.c
ts_fsm.c
ts_kmp.c
uuid.c	lib: reduce the use of module.h wherever possible	2012-03-07 15:04:04 -05:00
vsprintf.c	vsprintf: add support of '%*ph[CDN]'	2012-07-30 17:25:14 -07:00