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| author | Max Filippov <jcmvbkbc@gmail.com> | 2018-12-20 17:18:12 -0800 |
|---|---|---|
| committer | Max Filippov <jcmvbkbc@gmail.com> | 2019-05-07 10:36:31 -0700 |
| commit | f7c34874f04a80d6c39a32f08da2529e59602d3c (patch) | |
| tree | a225ab153205701d24bee7423fc950a9009cb533 /arch/xtensa/kernel | |
| parent | d065fcf12c21348cbc125460f75332f467518fb1 (diff) | |
| download | linux-f7c34874f04a80d6c39a32f08da2529e59602d3c.tar.bz2 | |
xtensa: add exclusive atomics support
Implement atomic primitives using exclusive access opcodes available in
the recent xtensa cores.
Since l32ex/s32ex don't have any memory ordering guarantees don't define
__smp_mb__before_atomic/__smp_mb__after_atomic to make them use memw.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Diffstat (limited to 'arch/xtensa/kernel')
| -rw-r--r-- | arch/xtensa/kernel/setup.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/xtensa/kernel/setup.c b/arch/xtensa/kernel/setup.c index 4ec6fbb696bf..c0ec24349421 100644 --- a/arch/xtensa/kernel/setup.c +++ b/arch/xtensa/kernel/setup.c @@ -651,6 +651,9 @@ c_show(struct seq_file *f, void *slot) #if XCHAL_HAVE_S32C1I "s32c1i " #endif +#if XCHAL_HAVE_EXCLUSIVE + "exclusive " +#endif "\n"); /* Registers. */ |