linux-kernel - [tip: locking/core] context_tracking: Make context_tracking_key __ro_after

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Date: Fri, 22 Mar 2024 10:58:13 -0000
From: "tip-bot2 for Valentin Schneider" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Valentin Schneider <vschneid@...hat.com>, Ingo Molnar <mingo@...nel.org>,
 Josh Poimboeuf <jpoimboe@...nel.org>, x86@...nel.org,
 linux-kernel@...r.kernel.org
Subject: [tip: locking/core] context_tracking: Make context_tracking_key
 __ro_after_init

The following commit has been merged into the locking/core branch of tip:

Commit-ID:     4eab44a8ae98df53e59f6af3c860142177235507
Gitweb:        https://git.kernel.org/tip/4eab44a8ae98df53e59f6af3c860142177235507
Author:        Valentin Schneider <vschneid@...hat.com>
AuthorDate:    Wed, 13 Mar 2024 19:01:04 +01:00
Committer:     Ingo Molnar <mingo@...nel.org>
CommitterDate: Fri, 22 Mar 2024 11:18:18 +01:00

context_tracking: Make context_tracking_key __ro_after_init

context_tracking_key is only ever enabled in __init ct_cpu_tracker_user(),
so mark it as __ro_after_init.

Signed-off-by: Valentin Schneider <vschneid@...hat.com>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
Acked-by: Josh Poimboeuf <jpoimboe@...nel.org>
Link: https://lore.kernel.org/r/20240313180106.2917308-3-vschneid@redhat.com
---
 kernel/context_tracking.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
index 70ae70d..24b1e11 100644
--- a/kernel/context_tracking.c
+++ b/kernel/context_tracking.c
@@ -432,7 +432,7 @@ static __always_inline void ct_kernel_enter(bool user, int offset) { }
 #define CREATE_TRACE_POINTS
 #include <trace/events/context_tracking.h>
 
-DEFINE_STATIC_KEY_FALSE(context_tracking_key);
+DEFINE_STATIC_KEY_FALSE_RO(context_tracking_key);
 EXPORT_SYMBOL_GPL(context_tracking_key);
 
 static noinstr bool context_tracking_recursion_enter(void)