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Oleg Nesterov 8ebe34731a percpu_rw_semaphore: add lockdep annotations 
Add lockdep annotations.  Not only this can help to find the potential
problems, we do not want the false warnings if, say, the task takes two
different percpu_rw_semaphore's for reading.  IOW, at least ->rw_sem
should not use a single class.

This patch exposes this internal lock to lockdep so that it represents the
whole percpu_rw_semaphore.  This way we do not need to add another "fake"
->lockdep_map and lock_class_key.  More importantly, this also makes the
output from lockdep much more understandable if it finds the problem.

In short, with this patch from lockdep pov percpu_down_read() and
percpu_up_read() acquire/release ->rw_sem for reading, this matches the
actual semantics.  This abuses __up_read() but I hope this is fine and in
fact I'd like to have down_read_no_lockdep() as well,
percpu_down_read_recursive_readers() will need it.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Anton Arapov <anton@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michal Marek <mmarek@suse.cz>
Cc: Mikulas Patocka <mpatocka@redhat.com>
Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-12-17 17:15:18 -08:00
..
lzo
lib: add support for LZO-compressed kernels
2010-01-11 09:34:04 -08:00
mpi
MPI: Fix compilation on MIPS with GCC 4.4 and newer
2012-11-23 18:57:17 +01:00
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
X.509: Implement simple static OID registry
2012-10-08 13:50:18 +10:30
argv_split.c
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
asn1_decoder.c
ASN.1: Fix an indefinite length skip error
2012-12-05 11:27:39 +10:30
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
usb/core: use bin2bcd() for bcdDevice in RH
2012-09-10 11:13:16 -07:00
bch.c
lib: add shared BCH ECC library
2011-03-11 14:25:50 +00:00
bitmap.c
propagate name change to comments in kernel source
2012-12-06 10:39:54 +01:00
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
build_OID_registry
X.509: Implement simple static OID registry
2012-10-08 13:50:18 +10:30
bust_spinlocks.c
oops handling: ensure that any oops is flushed to the mtdoops console
2009-01-06 15:59:11 -08:00
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
bootmem: fix wrong call parameter for free_bootmem()
2012-12-11 17:22:28 -08:00
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
sections: fix const sections for crc32 table
2012-10-06 03:04:46 +09:00
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
lib/decompress.c add __init to decompress_method and data
2012-10-06 03:05:32 +09:00
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
lib/dma-debug.c: fix __hash_bucket_find()
2012-10-19 14:07:48 -07:00
dump_stack.c
lib: reduce the use of module.h wherever possible
2012-03-07 15:04:04 -05:00
dynamic_debug.c
lib: dynamic_debug: use kbasename()
2012-12-17 17:15:17 -08:00
dynamic_queue_limits.c
bql: Avoid possible inconsistent calculation.
2012-05-31 18:18:17 -04:00
earlycpio.c
lib: Add early cpio decoder
2012-09-30 18:02:20 -07:00
extable.c
module: trim exception table on init free.
2009-06-12 21:47:04 +09:30
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/gcd.c: prevent possible div by 0
2012-10-06 03:04:57 +09:00
gen_crc32table.c
sections: fix const sections for crc32 table
2012-10-06 03:04:46 +09:00
genalloc.c
genalloc: stop crashing the system when destroying a pool
2012-10-25 14:37:52 -07:00
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
idr: rename MAX_LEVEL to MAX_IDR_LEVEL
2012-10-06 03:04:56 +09:00
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
interval_tree_test_main.c
rbtree: add prio tree and interval tree tests
2012-10-09 16:22:39 +09:00
interval_tree.c
mm: interval tree updates
2012-10-09 16:22:40 +09:00
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
kernel: is_current_single_threaded: don't use ->mmap_sem
2009-07-17 09:11:31 +10:00
jedec_ddr_data.c
ddr: add LPDDR2 data from JESD209-2
2012-05-02 00:04:06 -07:00
kasprintf.c
lib/kasprintf.c: use kmalloc_track_caller() to get accurate traces for kvasprintf
2012-10-11 08:50:15 +09:00
Kconfig
X.509: Implement simple static OID registry
2012-10-08 13:50:18 +10:30
Kconfig.debug
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2012-12-13 12:00:02 -08:00
Kconfig.kgdb
mips,kgdb: kdb low level trap catch and stack trace
2010-05-20 21:04:26 -05:00
Kconfig.kmemcheck
kmemcheck: depend on HAVE_ARCH_KMEMCHECK
2009-07-01 22:28:44 +02:00
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: hide struct module parameter in netlink_kernel_create
2012-09-08 18:46:30 -04:00
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
percpu_rw_semaphore: reimplement to not block the readers unnecessarily
2012-12-17 17:15:18 -08:00
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
netlink: add minlen validation for the new signed types
2012-08-30 13:11:46 -04:00
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
oid_registry.c
X.509: Add utility functions to render OIDs as strings
2012-10-08 13:50:18 +10:30
parser.c
lib/parser.c: avoid overflow in match_number()
2012-10-06 03:04:56 +09:00
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
percpu-rwsem.c
percpu_rw_semaphore: add lockdep annotations
2012-12-17 17:15:18 -08:00
plist.c
lib/plist.c: make plist test announcements KERN_DEBUG
2012-10-06 03:04:58 +09:00
pm-notifier-error-inject.c
PM: PM notifier error injection module
2012-07-30 17:25:22 -07:00
prio_heap.c
lib: fix sparse shadowed variable warning
2009-01-06 15:59:11 -08:00
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_test.c
rbtree: move augmented rbtree functionality to rbtree_augmented.h
2012-10-09 16:22:40 +09:00
rbtree.c
rbtree: move augmented rbtree functionality to rbtree_augmented.h
2012-10-09 16:22:40 +09:00
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 'for-3.7/core' of git://git.kernel.dk/linux-block
2012-10-11 09:04:23 +09:00
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
generic swap(): lib/sort.c: rename swap to swap_func
2009-01-08 08:31:14 -08:00
spinlock_debug.c
lib/spinlock_debug: avoid livelock in do_raw_spin_lock()
2012-10-06 03:04:57 +09:00
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: Do not export swiotlb_bounce since there are no external consumers
2012-10-30 09:32:07 -04:00
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
sscanf: don't ignore field widths for numeric conversions
2012-12-17 17:15:18 -08:00