linux-kernel - [PATCH v3] sh: nmi_debug: fix return value of _

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Message-Id: <20221003202425.11130-1-rdunlap@infradead.org>
Date:   Mon,  3 Oct 2022 13:24:25 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Igor Zhbanov <izh1979@...il.com>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v3] sh: nmi_debug: 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 nmi_debug_setup().

Fixes: 1e1030dccb10 ("sh: nmi_debug support.")
Signed-off-by: Randy Dunlap <rdunlap@...radead.org>
Reported-by: Igor Zhbanov <izh1979@...il.com>
Cc: Yoshinori Sato <ysato@...rs.sourceforge.jp>
Cc: Rich Felker <dalias@...c.org>
Cc: linux-sh@...r.kernel.org
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: stable@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>
---
v2: add more Cc's;
    refresh and resend;
v3: add Arnd to Cc: list

 arch/sh/kernel/nmi_debug.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/arch/sh/kernel/nmi_debug.c
+++ b/arch/sh/kernel/nmi_debug.c
@@ -49,7 +49,7 @@ static int __init nmi_debug_setup(char *
 	register_die_notifier(&nmi_debug_nb);
 
 	if (*str != '=')
-		return 0;
+		return 1;
 
 	for (p = str + 1; *p; p = sep + 1) {
 		sep = strchr(p, ',');
@@ -70,6 +70,6 @@ static int __init nmi_debug_setup(char *
 			break;
 	}
 
-	return 0;
+	return 1;
 }
 __setup("nmi_debug", nmi_debug_setup);