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| author | Guo Ren <guoren@linux.alibaba.com> | 2022-07-23 21:32:34 -0400 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2022-07-31 05:24:42 -0400 |
| commit | 45e15c1a375ea380d55880be2f8182cb737b60ed (patch) | |
| tree | d877ed3a2314bfe6ebfb2a6aa57ea9ef0ec4ec91 /ipc/msg.c | |
| parent | 4e8bb4ba5a558159ffbfa7e60322a1c151c3903c (diff) | |
csky: Add qspinlock support
Enable qspinlock by the requirements mentioned in a8ad07e5240c9
("asm-generic: qspinlock: Indicate the use of mixed-size atomics").
C-SKY only has "ldex/stex" for all atomic operations. So csky give a
strong forward guarantee for "ldex/stex." That means when ldex grabbed
the cache line into $L1, it would block other cores from snooping the
address with several cycles. The atomic_fetch_add & xchg16 has the same
forward guarantee level in C-SKY.
Qspinlock has better code size and performance in a fast path.
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Diffstat (limited to 'ipc/msg.c')
0 files changed, 0 insertions, 0 deletions