From: l3b2w1@gmail.com
To: mhiramat@kernel.org
Cc: naveen.n.rao@linux.ibm.com, anil.s.keshavamurthy@intel.com,
davem@davemloft.net, linux-kernel@vger.kernel.org,
"binglei.wang" <l3b2w1@gmail.com>
Subject: [PATCH] kprobes: drop the unnecessary unlikely()
Date: Mon, 13 Jun 2022 12:25:36 +0800 [thread overview]
Message-ID: <20220613042536.20329-1-l3b2w1@gmail.com> (raw)
From: "binglei.wang" <l3b2w1@gmail.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@gmail.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
next reply other threads:[~2022-06-13 4:25 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-13 4:25 l3b2w1 [this message]
2022-06-15 0:15 ` Masami Hiramatsu
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