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Subject: [RFC PATCH v2 13/20] context_tracking: Make context_tracking_key __ro_after_init
Date:   Thu, 20 Jul 2023 17:30:49 +0100
Message-Id: <20230720163056.2564824-14-vschneid@redhat.com>
In-Reply-To: <20230720163056.2564824-1-vschneid@redhat.com>
References: <20230720163056.2564824-1-vschneid@redhat.com>
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objtool now warns about it:

  vmlinux.o: warning: objtool: enter_from_user_mode+0x4e: Non __ro_after_init static key "context_tracking_key" in .noinstr section
  vmlinux.o: warning: objtool: enter_from_user_mode+0x50: Non __ro_after_init static key "context_tracking_key" in .noinstr section
  vmlinux.o: warning: objtool: syscall_enter_from_user_mode+0x60: Non __ro_after_init static key "context_tracking_key" in .noinstr section
  vmlinux.o: warning: objtool: syscall_enter_from_user_mode+0x62: Non __ro_after_init static key "context_tracking_key" in .noinstr section
  [...]

The key can only be enabled (and not disabled) in the __init function
ct_cpu_tracker_user(), so mark it as __ro_after_init.

Signed-off-by: Valentin Schneider <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 6ef0b35fc28c5..cc4f3a57f848c 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)
-- 
2.31.1