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@kernel.org>
Link: https://lore.kernel.org/r/20240611-hostfs-fix-mount-api-conversion-v1-1-ef75bbc77f44@kernel.org
Acked-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 6ec3c368d7bf9c8600c7209040f72c8a6784a442..e44747bbfe87ea7b65d1c82b54937912b54d5126 100644 (file)
--- 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;