[PATCH] kprobes/x86: Skip the assignment to ip when there is no post_handler

[Muchun Song]

When there is no post_handler, the assignment to ip of regs is
meaningless. So just skip it.

Signed-off-by: Muchun Song <songmuc...@bytedance.com>
---
 arch/x86/kernel/kprobes/ftrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/kprobes/ftrace.c b/arch/x86/kernel/kprobes/ftrace.c
index 681a4b36e9bbe..f1edc0dc860a2 100644
--- a/arch/x86/kernel/kprobes/ftrace.c
+++ b/arch/x86/kernel/kprobes/ftrace.c
@@ -39,8 +39,8 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long 
parent_ip,
                         * Emulate singlestep (and also recover regs->ip)
                         * as if there is a 5byte nop
                         */
-                       regs->ip = (unsigned long)p->addr + MCOUNT_INSN_SIZE;
                        if (unlikely(p->post_handler)) {
+                               regs->ip = (unsigned long)p->addr + 
MCOUNT_INSN_SIZE;
                                kcb->kprobe_status = KPROBE_HIT_SSDONE;
                                p->post_handler(p, regs, 0);
                        }
-- 
2.11.0