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
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
zlib_deflate
zlib_inflate
.gitignore	X.509: Implement simple static OID registry	2012-10-08 13:50:18 +10:30
argv_split.c
asn1_decoder.c	ASN.1: Fix an indefinite length skip error	2012-12-05 11:27:39 +10:30
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	usb/core: use bin2bcd() for bcdDevice in RH	2012-09-10 11:13:16 -07:00
bch.c
bitmap.c	propagate name change to comments in kernel source	2012-12-06 10:39:54 +01:00
bitrev.c
bsearch.c
btree.c	btree: catch NULL value before it does harm	2012-06-07 14:43:55 -07:00
bug.c
build_OID_registry	X.509: Implement simple static OID registry	2012-10-08 13:50:18 +10:30
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	bootmem: fix wrong call parameter for free_bootmem()	2012-12-11 17:22:28 -08:00
crc-ccitt.c
crc-itu-t.c
crc-t10dif.c
crc7.c
crc8.c
crc16.c
crc32.c	sections: fix const sections for crc32 table	2012-10-06 03:04:46 +09:00
crc32defs.h
ctype.c
debug_locks.c
debugobjects.c
dec_and_lock.c
decompress.c	lib/decompress.c add __init to decompress_method and data	2012-10-06 03:05:32 +09:00
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	lib/dma-debug.c: fix __hash_bucket_find()	2012-10-19 14:07:48 -07:00
dump_stack.c
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
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	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
hexdump.c
hweight.c
idr.c	idr: rename MAX_LEVEL to MAX_IDR_LEVEL	2012-10-06 03:04:56 +09:00
inflate.c
int_sqrt.c
interval_tree.c	mm: interval tree updates	2012-10-09 16:22:40 +09:00
interval_tree_test_main.c	rbtree: add prio tree and interval tree tests	2012-10-09 16:22:39 +09:00
iomap.c
iomap_copy.c
iommu-helper.c
ioremap.c
irq_regs.c
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/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
Kconfig.kmemcheck
klist.c
kobject.c	kobject: fix the uncorrect comment	2012-05-07 16:51:19 -07:00
kobject_uevent.c	netlink: hide struct module parameter in netlink_kernel_create	2012-09-08 18:46:30 -04:00
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
Makefile	percpu_rw_semaphore: reimplement to not block the readers unnecessarily	2012-12-17 17:15:18 -08:00
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	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
percpu-rwsem.c	percpu_rw_semaphore: add lockdep annotations	2012-12-17 17:15:18 -08:00
percpu_counter.c	switch the protection of percpu_counter list to spinlock	2012-07-31 09:28:31 +04:00
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
proportions.c
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
ratelimit.c
rational.c	lib: Change mail address of Oskar Schirmer	2012-05-17 15:18:37 +02:00
rbtree.c	rbtree: move augmented rbtree functionality to rbtree_augmented.h	2012-10-09 16:22:40 +09:00
rbtree_test.c	rbtree: move augmented rbtree functionality to rbtree_augmented.h	2012-10-09 16:22:40 +09:00
reciprocal_div.c
rwsem-spinlock.c
rwsem.c
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
show_mem.c
smp_processor_id.c
sort.c
spinlock_debug.c	lib/spinlock_debug: avoid livelock in do_raw_spin_lock()	2012-10-06 03:04:57 +09:00
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: Do not export swiotlb_bounce since there are no external consumers	2012-10-30 09:32:07 -04:00
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	sscanf: don't ignore field widths for numeric conversions	2012-12-17 17:15:18 -08:00