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linux-sg2042/fs/fscache
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David Howells dcfae32f89 FS-Cache: Don't use spin_is_locked() in assertions 
Under certain circumstances, spin_is_locked() is hardwired to 0 - even when the
code would normally be in a locked section where it should return 1.  This
means it cannot be used for an assertion that checks that a spinlock is locked.

Remove such usages from FS-Cache.

The following oops might otherwise be observed:

FS-Cache: Assertion failed
BUG: failure at fs/fscache/operation.c:270/fscache_start_operations()!
Kernel panic - not syncing: BUG!
CPU: 0 PID: 10 Comm: kworker/u2:1 Not tainted 3.10.0-rc1-00133-ge7ebb75 #2
Workqueue: fscache_operation fscache_op_work_func [fscache]
7f091c48 603c8947 7f090000 7f9b1361 7f25f080 00000001 7f26d440 7f091c90
60299eb8 7f091d90 602951c5 7f26d440 3000000008 7f091da0 7f091cc0 7f091cd0
00000007 00000007 00000006 7f091ae0 00000010 0000010e 7f9af330 7f091ae0
Call Trace:
7f091c88: [<60299eb8>] dump_stack+0x17/0x19
7f091c98: [<602951c5>] panic+0xf4/0x1e9
7f091d38: [<6002b10e>] set_signals+0x1e/0x40
7f091d58: [<6005b89e>] __wake_up+0x4e/0x70
7f091d98: [<7f9aa003>] fscache_start_operations+0x43/0x50 [fscache]
7f091da8: [<7f9aa1e3>] fscache_op_complete+0x1d3/0x220 [fscache]
7f091db8: [<60082985>] unlock_page+0x55/0x60
7f091de8: [<7fb25bb0>] cachefiles_read_copier+0x250/0x330 [cachefiles]
7f091e58: [<7f9ab03c>] fscache_op_work_func+0xac/0x120 [fscache]
7f091e88: [<6004d5b0>] process_one_work+0x250/0x3a0
7f091ef8: [<6004edc7>] worker_thread+0x177/0x2a0
7f091f38: [<6004ec50>] worker_thread+0x0/0x2a0
7f091f58: [<60054418>] kthread+0xd8/0xe0
7f091f68: [<6005bb27>] finish_task_switch.isra.64+0x37/0xa0
7f091fd8: [<600185cf>] new_thread_handler+0x8f/0xb0

Reported-by: Milosz Tanski <milosz@adfin.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-and-tested-By: Milosz Tanski <milosz@adfin.com>
 		2013-06-19 14:16:47 +01:00
..
Kconfig fscache: drop references to slow-work 2010-07-22 22:58:58 +02:00
Makefile FS-Cache: Allow the current state of all objects to be dumped 2009-11-19 18:11:04 +00:00
cache.c FS-Cache: Fix object state machine to have separate work and wait states 2013-06-19 14:16:47 +01:00
cookie.c FS-Cache: Simplify cookie retention for fscache_objects, fixing oops 2013-06-19 14:16:47 +01:00
fsdef.c FS-Cache: Simplify cookie retention for fscache_objects, fixing oops 2013-06-19 14:16:47 +01:00
histogram.c FS-Cache: Add use of /proc and presentation of statistics 2009-04-03 16:42:37 +01:00
internal.h FS-Cache: Simplify cookie retention for fscache_objects, fixing oops 2013-06-19 14:16:47 +01:00
main.c FS-Cache: Simplify cookie retention for fscache_objects, fixing oops 2013-06-19 14:16:47 +01:00
netfs.c FS-Cache: Simplify cookie retention for fscache_objects, fixing oops 2013-06-19 14:16:47 +01:00
object-list.c FS-Cache: Simplify cookie retention for fscache_objects, fixing oops 2013-06-19 14:16:47 +01:00
object.c FS-Cache: Simplify cookie retention for fscache_objects, fixing oops 2013-06-19 14:16:47 +01:00
operation.c FS-Cache: Don't use spin_is_locked() in assertions 2013-06-19 14:16:47 +01:00
page.c FS-Cache: The retrieval remaining-pages counter needs to be atomic_t 2013-06-19 14:16:47 +01:00
proc.c FS-Cache: Allow the current state of all objects to be dumped 2009-11-19 18:11:04 +00:00
stats.c fs/fscache/stats.c: fix memory leak 2013-04-29 15:54:27 -07:00