linux-kernel - [PATCH v4] sparc64: NMI watchdog: fix return value of _

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Date:   Mon,  3 Oct 2022 13:24:41 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Igor Zhbanov <izh1979@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        sparclinux@...r.kernel.org, Sam Ravnborg <sam@...nborg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v4] sparc64: NMI watchdog: fix return value of __setup handler

__setup() handlers should return 1 to obsolete_checksetup() in
init/main.c to indicate that the boot option has been handled.
A return of 0 causes the boot option/value to be listed as an Unknown
kernel parameter and added to init's (limited) argument or environment
strings. Also, error return codes don't mean anything to
obsolete_checksetup() -- only non-zero (usually 1) or zero.
So return 1 from setup_nmi_watchdog().

Fixes: e5553a6d0442 ("sparc64: Implement NMI watchdog on capable cpus.")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: Igor Zhbanov <izh1979@...il.com>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@...russia.ru
Cc: "David S. Miller" <davem@...emloft.net>
Cc: sparclinux@...r.kernel.org
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: stable@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>
---
v2: change From" Igor to Reported-by:
    add more Cc's
v3: use Igor's current email address
v4: add Arnd to Cc: list

 arch/sparc/kernel/nmi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/sparc/kernel/nmi.c
+++ b/arch/sparc/kernel/nmi.c
@@ -274,7 +274,7 @@ static int __init setup_nmi_watchdog(cha
 	if (!strncmp(str, "panic", 5))
 		panic_on_timeout = 1;
 
-	return 0;
+	return 1;
 }
 __setup("nmi_watchdog=", setup_nmi_watchdog);