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alpha: select ARCH_SUPPORTS_ATOMIC_RMW

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Alpha has native LL/SC instructions (LDL_L/STL_C, LDQ_L/STQ_C) that
provide atomic read-modify-write capability, and already selects
ARCH_HAVE_NMI_SAFE_CMPXCHG.

Selecting ARCH_SUPPORTS_ATOMIC_RMW enables MUTEX_SPIN_ON_OWNER and
RWSEM_SPIN_ON_OWNER on SMP, allowing optimistic spinning on contended
locks rather than immediately sleeping.

Assisted-by: Claude:claude-opus-4-6
Signed-off-by: Matt Turner <mattst88@gmail.com>
Tested-by: Magnus Lindholm <linmag7@gmail.com>
Reviewed-by: Magnus Lindholm <linmag7@gmail.com>
Link: https://lore.kernel.org/r/20260905-arch-kconfig-options-v2-v2-6-83e8245761a2@gmail.com
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
This commit is contained in:
Matt Turner 2026-09-05 15:29:27 -04:00 committed by Magnus Lindholm
parent 533993a3ac
commit b345db9e12
1 changed files with 1 additions and 0 deletions
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arch/alpha/Kconfig
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@ -14,6 +14,7 @@ config ALPHA
select ARCH_MODULE_NEEDS_WEAK_PER_CPU if SMP
select ARCH_NO_PREEMPT
select ARCH_NO_SG_CHAIN
select ARCH_SUPPORTS_ATOMIC_RMW
select ARCH_USE_CMPXCHG_LOCKREF
select FORCE_PCI
select PCI_DOMAINS if PCI