[PATCH v2 4/5] x86/speculation: Make mds_user_clear __ro_after_init

From: Valentin Schneider
Date: Tue Feb 06 2024 - 12:43:11 EST


mds_user_clear is only ever enabled in:
o __init mds_select_mitigation()
o __init taa_select_mitigation()
o __init mmio_select_mitigation()

mark it as __ro_after_init.

Signed-off-by: Valentin Schneider <vschneid@xxxxxxxxxx>
Acked-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
---
arch/x86/kernel/cpu/bugs.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c
index bb0ab8466b919..bab36096015d8 100644
--- a/arch/x86/kernel/cpu/bugs.c
+++ b/arch/x86/kernel/cpu/bugs.c
@@ -112,7 +112,7 @@ DEFINE_STATIC_KEY_FALSE(switch_mm_cond_ibpb);
DEFINE_STATIC_KEY_FALSE(switch_mm_always_ibpb);

/* Control MDS CPU buffer clear before returning to user space */
-DEFINE_STATIC_KEY_FALSE(mds_user_clear);
+DEFINE_STATIC_KEY_FALSE_RO(mds_user_clear);
EXPORT_SYMBOL_GPL(mds_user_clear);
/* Control MDS CPU buffer clear before idling (halt, mwait) */
DEFINE_STATIC_KEY_FALSE(mds_idle_clear);
--
2.43.0