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[RFT,02/13] kprobes: Remove redundant arch_disarm_kprobe() call

Message ID 157918586979.29301.15267608912757298568.stgit@devnote2
State RFC
Headers show
Series tracing: kprobes: Introduce async unregistration | expand

Commit Message

Masami Hiramatsu (Google) Jan. 16, 2020, 2:44 p.m. UTC 
Fix to remove redundant arch_disarm_kprobe() call in
force_unoptimize_kprobe(). This arch_disarm_kprobe()
will be done if the kprobe is optimized but disabled,
but that means the kprobe (optprobe) is unused
(unoptimizing) state.
In that case, unoptimize_kprobe() puts it in freeing_list
and kprobe_optimizer automatically disarm it. So this
arch_disarm_kprobe() is redundant.

Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
---
 kernel/kprobes.c |    2 --
 1 file changed, 2 deletions(-)
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Patch

diff --git a/kernel/kprobes.c b/kernel/kprobes.c
index 52b05ab9c323..a2c755e79be7 100644
--- a/kernel/kprobes.c
+++ b/kernel/kprobes.c
@@ -674,8 +674,6 @@  static void force_unoptimize_kprobe(struct optimized_kprobe *op)
 	lockdep_assert_cpus_held();
 	arch_unoptimize_kprobe(op);
 	op->kp.flags &= ~KPROBE_FLAG_OPTIMIZED;
-	if (kprobe_disabled(&op->kp))
-		arch_disarm_kprobe(&op->kp);
 }
 
 /* Unoptimize a kprobe if p is optimized */