[PATCH v2 20/22] alpha: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM

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

diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig
index 33b51bef5139..e5611766b6d6 100644
--- a/arch/alpha/Kconfig
+++ b/arch/alpha/Kconfig

@@ -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

-- 
2.54.0