linux-kernel - [PATCH] kprobes: drop the unnecessary unlikely()

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Message-Id: <20220613042536.20329-1-l3b2w1@gmail.com>
Date:   Mon, 13 Jun 2022 12:25:36 +0800
From:   l3b2w1@...il.com
To:     mhiramat@...nel.org
Cc:     naveen.n.rao@...ux.ibm.com, anil.s.keshavamurthy@...el.com,
        davem@...emloft.net, linux-kernel@...r.kernel.org,
        "binglei.wang" <l3b2w1@...il.com>
Subject: [PATCH] kprobes: drop the unnecessary unlikely()

From: "binglei.wang" <l3b2w1@...il.com>

!ap is likely when checking re-registering existing kprobe.
	register_kprobe -> warn_kprobe_rereg -> __get_valid_kprobe

!ap is unlikely when checking whether the kprobe is valid
on enable/disable ocassion.
	__disable_kprobe/enable_kprobe -> __get_valid_kprobe

Considering these two cases, choose to drop the unlikely() here.

Signed-off-by: binglei.wang <l3b2w1@...il.com>
---
 kernel/kprobes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index f214f8c08..f4a829d98 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -1504,7 +1504,7 @@ static struct kprobe *__get_valid_kprobe(struct kprobe *p)
 	lockdep_assert_held(&kprobe_mutex);
 
 	ap = get_kprobe(p->addr);
-	if (unlikely(!ap))
+	if (!ap)
 		return NULL;
 
 	if (p != ap) {
-- 
2.27.0