linux-kernel - [PATCH 1/1] sched: panic, when call schedule with preemption disable

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Message-ID: <1574323985-24193-1-git-send-email-yt.chang@mediatek.com>
Date:   Thu, 21 Nov 2019 16:13:05 +0800
From:   YT Chang <yt.chang@...iatek.com>
To:     YT Chang <yt.chang@...iatek.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Matthias Brugger <matthias.bgg@...il.com>
CC:     <wsd_upstream@...iatek.com>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>
Subject: [PATCH 1/1] sched: panic, when call schedule with preemption disable

When preemption is disable, call schedule() is incorrect behavior.
Suggest to panic directly rather than depend on panic_on_warn.

Signed-off-by: YT Chang <yt.chang@...iatek.com>
---
 kernel/sched/core.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 7880f4f..214e8d8 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -3861,9 +3861,8 @@ static noinline void __schedule_bug(struct task_struct *prev)
 		print_ip_sym(preempt_disable_ip);
 		pr_cont("\n");
 	}
-	if (panic_on_warn)
-		panic("scheduling while atomic\n");
 
+	panic("scheduling while atomic\n");
 	dump_stack();
 	add_taint(TAINT_WARN, LOCKDEP_STILL_OK);
 }
-- 
1.9.1