[PATCH] alpha: Select ARCH_WANT_IRQS_OFF_ACTIVATE_MM

[PATCH] alpha: Select ARCH_WANT_IRQS_OFF_ACTIVATE_MM

[Matt Turner]

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>
---
 arch/alpha/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git ./arch/alpha/Kconfig ./arch/alpha/Kconfig
index a29788e588ee..1ba472a98bb2 100644
--- ./arch/alpha/Kconfig
+++ ./arch/alpha/Kconfig
@@ -37,6 +37,7 @@ config ALPHA
 	select AUTO_IRQ_AFFINITY if SMP
 	select GENERIC_IRQ_SHOW
 	select ARCH_WANT_FRAME_POINTERS
+	select ARCH_WANT_IRQS_OFF_ACTIVATE_MM
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG
 	select AUDIT_ARCH
-- 
2.52.0