diff options
| author | Frederic Weisbecker <[email protected]> | 2009-01-25 12:50:13 -0800 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2009-01-26 14:06:36 +0100 |
| commit | 2d4d57db692ea790e185656516e6ebe8791f1788 (patch) | |
| tree | f7ad21dbcb4d5de2f0eb63024c1b5f1bf5321d76 /drivers/message/fusion/lsi/mpi_raid.h | |
| parent | 7106a5ab89c50c6b5aadea0850b40323804a922d (diff) | |
x86: micro-optimize __raw_read_trylock()
The current version of __raw_read_trylock starts with decrementing the lock
and read its new value as a separate operation after that.
That makes 3 dereferences (read, write (after sub), read) whereas
a single atomic_dec_return does only two pointers dereferences (read, write).
Signed-off-by: Frederic Weisbecker <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'drivers/message/fusion/lsi/mpi_raid.h')
0 files changed, 0 insertions, 0 deletions