linux-kernel - [PATCH] panic: Avoid dump

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Date:   Fri, 13 Nov 2020 13:47:47 +0800
From:   Kefeng Wang <wangkefeng.wang@...wei.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>
CC:     Alexey Kardashevskiy <aik@...abs.ru>,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: [PATCH] panic: Avoid dump_stack() twice

stacktrace will be dumped twice on ARM64 after commit 3f388f28639f
("panic: dump registers on panic_on_warn"), will not dump_stack
when no regs as before.

Fixes: 3f388f28639f ("panic: dump registers on panic_on_warn")
Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
---
 kernel/panic.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/panic.c b/kernel/panic.c
index 396142ee43fd..332736a72a58 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -605,7 +605,8 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
 		panic("panic_on_warn set ...\n");
 	}
 
-	dump_stack();
+	if (!regs)
+		dump_stack();
 
 	print_irqtrace_events(current);
 
-- 
2.26.2