[PATCH] panic: Avoid dump_stack() twice

[Kefeng Wang]

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.w...@huawei.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