diff options
| author | Jan Blunck | 2009-06-17 00:33:33 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2009-06-17 04:47:47 +0200 |
| commit | 417dcdf99ec9f8d8d6917189130bdc17cb67c678 (patch) | |
| tree | 4a97ab3ec286dda502ee7b3a16e0b6186cdc30d9 /kernel/kfifo.c | |
| parent | utsname.h: make new_utsname fields use the proper length constant (diff) | |
| download | kernel-qcow2-linux-417dcdf99ec9f8d8d6917189130bdc17cb67c678.tar.gz kernel-qcow2-linux-417dcdf99ec9f8d8d6917189130bdc17cb67c678.tar.xz kernel-qcow2-linux-417dcdf99ec9f8d8d6917189130bdc17cb67c678.zip | |
atomic: only take lock when the counter drops to zero on UP as well
_atomic_dec_and_lock() should not unconditionally take the lock before
calling atomic_dec_and_test() in the UP case. For consistency reasons it
should behave exactly like in the SMP case.
Besides that this works around the problem that with CONFIG_DEBUG_SPINLOCK
this spins in __spin_lock_debug() if the lock is already taken even if the
counter doesn't drop to 0.
Signed-off-by: Jan Blunck <jblunck@suse.de>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: Nick Piggin <npiggin@suse.de>
Cc: Valerie Aurora <vaurora@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/kfifo.c')
0 files changed, 0 insertions, 0 deletions