David Howells wrote:
Nick Piggin <[email protected]> wrote:
atomic_cmpxchg should be available on all platforms.
Two points:
(1) If it's using spinlocks, then it's pointless to use atomic_cmpxchg.
Why?
(2) atomic_t is a 32-bit type, and on a 64-bit platform I will want a 64-bit
type so that I can stick the owner address in there (I've got a second
variant not yet released).
I'm sure you could use a seperate field as it would be a debug
option, right?
But atomic longs are coming along and it is probably feasable to
do 64-bit atomic_cmpxchg on all 64-bit word architectures if you
really needed that.
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