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由 Michael S. Tsirkin 提交于
Looks like future sh variants will support a 4-byte cas which will be used to implement 1 and 2 byte xchg. This is exactly what we do for llsc now, move the portable part of the code into a separate header so it's easy to reuse. Suggested-by: NRich Felker <dalias@libc.org> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com> Acked-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
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