linux-kernel - [PATCH v4] sparc: vDSO: fix return value of _

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Date:   Mon,  3 Oct 2022 13:24:55 -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,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Nick Alcock <nick.alcock@...cle.com>,
        Sam Ravnborg <sam@...nborg.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        stable@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH v4] sparc: vDSO: 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 vdso_setup().

Fixes: 9a08862a5d2e ("vDSO for sparc")
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: Dan Carpenter <dan.carpenter@...cle.com>
Cc: Nick Alcock <nick.alcock@...cle.com>
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: correct the Fixes: tag (Dan Carpenter)
v3: add more Cc's;
    correct Igor's email address;
    change From: Igor to Reported-by: Igor;
v4: add Arnd to Cc: list

 arch/sparc/vdso/vma.c |    7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

--- a/arch/sparc/vdso/vma.c
+++ b/arch/sparc/vdso/vma.c
@@ -449,9 +449,8 @@ static __init int vdso_setup(char *s)
 	unsigned long val;
 
 	err = kstrtoul(s, 10, &val);
-	if (err)
-		return err;
-	vdso_enabled = val;
-	return 0;
+	if (!err)
+		vdso_enabled = val;
+	return 1;
 }
 __setup("vdso=", vdso_setup);