From: Mark Charlebois <charlebm@gmail.com>
Date: Fri, 28 Apr 2017 22:15:12 +0000 (-0700)
Subject: fs: compat: Remove warning from COMPATIBLE_IOCTL
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=01bec25fefe33c2ba79e56b804739e210d45579e;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

fs: compat: Remove warning from COMPATIBLE_IOCTL

commit 9280cdd6fe5b8287a726d24cc1d558b96c8491d7 upstream.

cmd in COMPATIBLE_IOCTL is always a u32, so cast it so there isn't a
warning about an overflow in XFORM.

From: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Mark Charlebois <charlebm@gmail.com>
Signed-off-by: Behan Webster <behanw@converseincode.com>
Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
Acked-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Cc: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 1d3968962be6..5af4536ba7cd 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -811,7 +811,7 @@ static int compat_ioctl_preallocate(struct file *file,
  */
 #define XFORM(i) (((i) ^ ((i) << 27) ^ ((i) << 17)) & 0xffffffff)
 
-#define COMPATIBLE_IOCTL(cmd) XFORM(cmd),
+#define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd),
 /* ioctl should not be warned about even if it's not implemented.
    Valid reasons to use this:
    - It is implemented with ->compat_ioctl on some device, but programs