Make is_endbr() invisible to tracing, which has security benefits, as we
discussed in [1].

Link: https://lore.kernel.org/all/20250922065248.GO3245006@noisy.programming.kicks-ass.net/ [1]
Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn>
---
 arch/x86/include/asm/ibt.h    | 2 +-
 arch/x86/kernel/alternative.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/include/asm/ibt.h b/arch/x86/include/asm/ibt.h
index 5e45d6424722..54937a527042 100644
--- a/arch/x86/include/asm/ibt.h
+++ b/arch/x86/include/asm/ibt.h
@@ -65,7 +65,7 @@ static __always_inline __attribute_const__ u32 gen_endbr_poison(void)
 	return 0xd6401f0f; /* nopl -42(%rax) */
 }
 
-static inline bool __is_endbr(u32 val)
+static __always_inline bool __is_endbr(u32 val)
 {
 	if (val == gen_endbr_poison())
 		return true;
diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 8ee5ff547357..9d07dcbd9b1d 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -1108,7 +1108,7 @@ void __init_or_module noinline apply_returns(s32 *start, s32 *end) { }
 
 #ifdef CONFIG_X86_KERNEL_IBT
 
-__noendbr bool is_endbr(u32 *val)
+__noendbr noinstr bool is_endbr(u32 *val)
 {
 	u32 endbr;
 
-- 
2.51.0