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| author | Michael S. Tsirkin <mst@redhat.com> | 2016-01-07 17:54:54 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2016-01-12 20:47:01 +0200 |
| commit | 3226aad81aa670015a59e51458a0deb2d3bcb600 (patch) | |
| tree | 0cc2ab0abf363ad3f851fdcb14c0f7c1386e89de /arch/sh/include/asm/segment.h | |
| parent | a65961272e1ebdb60804bbe2bb440481fcbd1c76 (diff) | |
| download | blackbird-op-linux-3226aad81aa670015a59e51458a0deb2d3bcb600.tar.gz blackbird-op-linux-3226aad81aa670015a59e51458a0deb2d3bcb600.zip | |
sh: support 1 and 2 byte xchg
This completes the xchg implementation for sh architecture. Note: The
llsc variant is tricky since this only supports 4 byte atomics, the
existing implementation of 1 byte xchg is wrong: we need to do a 4 byte
cmpxchg and retry if any bytes changed meanwhile.
Write this in C for clarity.
Suggested-by: Rich Felker <dalias@libc.org>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Diffstat (limited to 'arch/sh/include/asm/segment.h')
0 files changed, 0 insertions, 0 deletions
