initrd: remove the BLKFLSBUF call in handle_initrd

BLKFLSBUF used to be overloaded for the ramdisk driver to free the whole
ramdisk, which was completely different behavior compared to all other
drivers.  But this magic overload got removed in commit ff26956875c2
("brd: remove support for BLKFLSBUF"), so this call is entirely
pointless now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c
index d72beda..e4f88e9 100644 (file)
--- a/init/do_mounts_initrd.c
+++ b/init/do_mounts_initrd.c
@@ -115,21 +115,12 @@ static void __init handle_initrd(void)
        if (!error)
                printk("okay\n");
        else {
-               int fd = ksys_open("/dev/root.old", O_RDWR, 0);
                if (error == -ENOENT)
                        printk("/initrd does not exist. Ignored.\n");
                else
                        printk("failed\n");
                printk(KERN_NOTICE "Unmounting old root\n");
                ksys_umount("/old", MNT_DETACH);
-               printk(KERN_NOTICE "Trying to free ramdisk memory ... ");
-               if (fd < 0) {
-                       error = fd;
-               } else {
-                       error = ksys_ioctl(fd, BLKFLSBUF, 0);
-                       ksys_close(fd);
-               }
-               printk(!error ? "okay\n" : "failed\n");
        }
 }