linux-kernel - [PATCH 30/30] um: Avoid duplicate call to kmsg

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Date:   Wed, 27 Apr 2022 19:49:24 -0300
From:   "Guilherme G. Piccoli" <gpiccoli@...lia.com>
To:     akpm@...ux-foundation.org, bhe@...hat.com, pmladek@...e.com,
        kexec@...ts.infradead.org
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        tglx@...utronix.de, vgoyal@...hat.com, vkuznets@...hat.com,
        will@...nel.org, Anton Ivanov <anton.ivanov@...bridgegreys.com>,
        Johannes Berg <johannes@...solutions.net>,
        Richard Weinberger <richard@....at>
Subject: [PATCH 30/30] um: Avoid duplicate call to kmsg_dump()

Currently the panic notifier panic_exit() calls kmsg_dump() and
some console flushing routines - this makes sense since such
panic notifier exits UserMode Linux and never returns.

Happens that after a panic refactor, kmsg_dump() is now always
called *before* the pre_reboot list of panic notifiers, in which
panic_exit() belongs, leading to a double call situation.

This patch changes that by removing such call from the panic
notifier, but leaving the console flushing calls since the
pre_reboot list still runs before console flushing on panic().

Cc: Anton Ivanov <anton.ivanov@...bridgegreys.com>
Cc: Johannes Berg <johannes@...solutions.net>
Cc: Richard Weinberger <richard@....at>
Signed-off-by: Guilherme G. Piccoli <gpiccoli@...lia.com>
---
 arch/um/kernel/um_arch.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
index fc6e443299da..651310e3e86f 100644
--- a/arch/um/kernel/um_arch.c
+++ b/arch/um/kernel/um_arch.c
@@ -241,7 +241,6 @@ static void __init uml_postsetup(void)
 static int panic_exit(struct notifier_block *self, unsigned long unused1,
 		      void *unused2)
 {
-	kmsg_dump(KMSG_DUMP_PANIC);
 	bust_spinlocks(1);
 	bust_spinlocks(0);
 	uml_exitcode = 1;
-- 
2.36.0