linux-kernel - [PATCH] ftrace: disable preemption when recursion locked in arch/s390/kernel/ftrace.c

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Message-Id: <20211208151503.1510381-1-jmarchan@redhat.com>
Date:   Wed,  8 Dec 2021 16:15:03 +0100
From:   "Jerome Marchand" <jmarchan@...hat.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>
Cc:     王贇 <yun.wang@...ux.alibaba.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ftrace: disable preemption when recursion locked in arch/s390/kernel/ftrace.c

It looks like commit ce5e48036c9e76a2 ("ftrace: disable preemption
when recursion locked") missed a spot in kprobe_ftrace_handler() in
arch/s390/kernel/ftrace.c.
Removes the superfluous preempt_disable/enable_notrace() there too.

Fixes: ce5e48036c9e76a2 ("ftrace: disable preemption when recursion locked")
Signed-off-by: Jerome Marchand <jmarchan@...hat.com>
---
 arch/s390/kernel/ftrace.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
index 5510c7d10ddc..21d62d8b6b9a 100644
--- a/arch/s390/kernel/ftrace.c
+++ b/arch/s390/kernel/ftrace.c
@@ -290,7 +290,6 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 		return;
 
 	regs = ftrace_get_regs(fregs);
-	preempt_disable_notrace();
 	p = get_kprobe((kprobe_opcode_t *)ip);
 	if (unlikely(!p) || kprobe_disabled(p))
 		goto out;
@@ -318,7 +317,6 @@ void kprobe_ftrace_handler(unsigned long ip, unsigned long parent_ip,
 	}
 	__this_cpu_write(current_kprobe, NULL);
 out:
-	preempt_enable_notrace();
 	ftrace_test_recursion_unlock(bit);
 }
 NOKPROBE_SYMBOL(kprobe_ftrace_handler);
-- 
2.31.1