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arch: Introduce arch_{,try_}_cmpxchg128{,_local}()

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For all architectures that currently support cmpxchg_double()
implement the cmpxchg128() family of functions that is basically the
same but with a saner interface.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Mark Rutland <mark.rutland@arm.com>
Link: https://lore.kernel.org/r/20230531132323.452120708@infradead.org
This commit is contained in:
Peter Zijlstra 2023-05-31 15:08:36 +02:00
commit b23e139d0b
6 changed files with 177 additions and 2 deletions
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