linux-kernel - [PATCH v2 7/9] x86/kprobes: Make trampoline

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Date:   Fri, 29 Mar 2019 17:47:41 -0700
From:   Andi Kleen <andi@...stfloor.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        mhiramat@...nel.org
Subject: [PATCH v2 7/9] x86/kprobes: Make trampoline_handler global and visible

From: Andi Kleen <ak@...ux.intel.com>

This function is referenced from assembler, so in LTO
it needs to be global and visible to not be optimized away.

Cc: mhiramat@...nel.org
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Signed-off-by: Andi Kleen <ak@...ux.intel.com>
---
 arch/x86/kernel/kprobes/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/kprobes/core.c b/arch/x86/kernel/kprobes/core.c
index 31ab91c9c4e9..1309a4eb3119 100644
--- a/arch/x86/kernel/kprobes/core.c
+++ b/arch/x86/kernel/kprobes/core.c
@@ -752,7 +752,7 @@ STACK_FRAME_NON_STANDARD(kretprobe_trampoline);
 /*
  * Called from kretprobe_trampoline
  */
-static __used void *trampoline_handler(struct pt_regs *regs)
+__used __visible void *trampoline_handler(struct pt_regs *regs)
 {
 	struct kretprobe_instance *ri = NULL;
 	struct hlist_head *head, empty_rp;
-- 
2.20.1