[PATCH] change get_sb prototype

(i) The prototypes for free_vfsmnt(), alloc_vfsmnt(), do_kern_mount()
    so far occurred in several individual c files.  Now they are in
    <linux/mount.h>.

(ii) do_kern_mount() has a third argument name that is typically a
     constant.  It is called with "rootfs", "nfsd", type->name,
     "capifs", "usbdevfs", "binfmt_misc" etc.  So, it should have a
     prototype that expresses this:

	do_kern_mount(const char *fstype, int flags, const char *name, void *data);

This makes the ugly cast

-       return do_kern_mount(type->name, 0, (char *)type->name, NULL);
+       return do_kern_mount(type->name, 0, type->name, NULL);

go away. Now do_kern_mount() calls type->get_sb(), so also get_sb()
must have a const third argument. That is what the patch below does.

If I am not mistaken, precisely two filesystems do not treat this
argument as a constant, namely afs and cifs. A separate patch
gives some cleanup there.

1 files changed, 1 insertions, 1 deletions

diff --git a/kernel/futex.c b/kernel/futex.c
index df2dcbf557d0..5cd746c3c86c 100644
--- a/kernel/futex.c
+++ b/kernel/futex.c
@@ -545,7 +545,7 @@ asmlinkage long sys_futex(u32 __user *uaddr, int op, int val,
 
 static struct super_block *
 futexfs_get_sb(struct file_system_type *fs_type,
-	       int flags, char *dev_name, void *data)
+	       int flags, const char *dev_name, void *data)
 {
 	return get_sb_pseudo(fs_type, "futex", NULL, 0xBAD1DEA);
 }