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alpha: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM

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activate_mm() on Alpha calls __load_new_mm_context() which assigns a
new ASID and invokes PALcode swpctx. On SMP, an interrupt arriving
between the ASID update and the page table switch could see
inconsistent state. Ensure activate_mm() is called with interrupts
disabled during exec.

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-v2-20-83e8245761a2@gmail.com
Signed-off-by: Magnus Lindholm <linmag7@gmail.com>
This commit is contained in:
Matt Turner 2026-09-05 15:29:41 -04:00 committed by Magnus Lindholm
parent 62fc4695be
commit 04e57b9e71
1 changed files with 1 additions and 0 deletions
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arch/alpha/Kconfig
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@ -39,6 +39,7 @@ config ALPHA
select GENERIC_PCI_IOMAP
select AUTO_IRQ_AFFINITY if SMP
select GENERIC_IRQ_SHOW
select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
select ARCH_WANT_IPC_PARSE_VERSION
select ARCH_WANT_LD_ORPHAN_WARN
select ARCH_HAVE_NMI_SAFE_CMPXCHG