linux-kernel - [PATCH v2 2/2] sysctl: fix return type to make compiler happy

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Date:   Mon, 24 Jan 2022 10:18:13 -0800
From:   Tong Zhang <ztong0001@...il.com>
To:     Alexander Viro <viro@...iv.linux.org.uk>,
        Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Iurii Zaikin <yzaikin@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Tong Zhang <ztong0001@...il.com>, kernel test robot <lkp@...el.com>
Subject: [PATCH v2 2/2] sysctl: fix return type to make compiler happy

When CONFIG_SYSCTL=n and CONFIG_BINFMT_MISC={y,m}, compiler will
complain due to return type not matching. Fix the return type in
register_sysctl_mount_point() to make compiler happy

fs/binfmt_misc.c: In function ‘init_misc_binfmt’:
fs/binfmt_misc.c:827:21: error: assignment to ‘struct ctl_table_header *’ from incompatible pointer type ‘struct sysctl_header *’ [-Werror=incompatible-pointer-types]
  827 |  binfmt_misc_header = register_sysctl_mount_point("fs/binfmt_misc");

Fixes: ee9efac48a08("sysctl: add helper to register a sysctl mount point")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Tong Zhang <ztong0001@...il.com>
---
 include/linux/sysctl.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/sysctl.h b/include/linux/sysctl.h
index 180adf7da785..6353d6db69b2 100644
--- a/include/linux/sysctl.h
+++ b/include/linux/sysctl.h
@@ -265,7 +265,7 @@ static inline struct ctl_table_header *register_sysctl_table(struct ctl_table *
 	return NULL;
 }
 
-static inline struct sysctl_header *register_sysctl_mount_point(const char *path)
+static inline struct ctl_table_header *register_sysctl_mount_point(const char *path)
 {
 	return NULL;
 }
-- 
2.25.1