linux-kernel - [PATCH] hostfs: Add const qualifier to host_root in hostfs_fill

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Message-Id: <20240611-hostfs-fix-mount-api-conversion-v1-1-ef75bbc77f44@kernel.org>
Date: Tue, 11 Jun 2024 12:58:41 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Christian Brauner <brauner@...nel.org>
Cc: Hongbo Li <lihongbo22@...wei.com>, Richard Weinberger <richard@....at>, 
 Anton Ivanov <anton.ivanov@...bridgegreys.com>, 
 Johannes Berg <johannes@...solutions.net>, linux-um@...ts.infradead.org, 
 linux-kernel@...r.kernel.org, Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH] hostfs: Add const qualifier to host_root in
 hostfs_fill_super()

After the recent conversion to the new mount API, there is a warning
when building hostfs (which may be upgraded to an error via
CONFIG_WERROR=y):

  fs/hostfs/hostfs_kern.c: In function 'hostfs_fill_super':
  fs/hostfs/hostfs_kern.c:942:27: warning: initialization discards 'const' qualifier from pointer target type [-Wdiscarded-qualifiers]
    942 |         char *host_root = fc->source;
        |                           ^~

Add the 'const' qualifier, as host_root will not be modified after its
assignment. Move the assignment to keep the existing reverse Christmas
tree order intact.

Fixes: cd140ce9f611 ("hostfs: convert hostfs to use the new mount API")
Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 fs/hostfs/hostfs_kern.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 6ec3c368d7bf..e44747bbfe87 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -938,8 +938,8 @@ static const struct inode_operations hostfs_link_iops = {
 static int hostfs_fill_super(struct super_block *sb, struct fs_context *fc)
 {
 	struct hostfs_fs_info *fsi = sb->s_fs_info;
+	const char *host_root = fc->source;
 	struct inode *root_inode;
-	char *host_root = fc->source;
 	int err;
 
 	sb->s_blocksize = 1024;

---
base-commit: cd140ce9f611a5e9d2a5989a282b75e55c71dab3
change-id: 20240611-hostfs-fix-mount-api-conversion-83eda29c74fe

Best regards,
-- 
Nathan Chancellor <nathan@...nel.org>