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From: Matthias Kaehlcke <mka@chromium.org>
To: Alexander Viro <viro@zeniv.linux.org.uk>,
	Mark Charlebois <charlebm@gmail.com>,
	Behan Webster <behanw@converseincode.com>,
	Arnd Bergmann <arnd@arndb.de>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	Grant Grundler <grundler@chromium.org>,
	Michael Davidson <md@google.com>,
	Greg Hackmann <ghackmann@google.com>,
	Peter Foley <pefoley2@pefoley.com>,
	Matthias Kaehlcke <mka@chromium.org>
Subject: [PATCH] fs: compat: Remove warning from COMPATIBLE_IOCTL
Date: Tue,  4 Apr 2017 11:07:20 -0700	[thread overview]
Message-ID: <20170404180720.182336-1-mka@chromium.org> (raw)

From: Mark Charlebois <charlebm@gmail.com>

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>
---
Resending https://patchwork.kernel.org/patch/4961631/

 fs/compat_ioctl.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 11d087b2b28e..6116d5275a3e 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -833,7 +833,7 @@ 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
-- 
2.12.2.715.g7642488e1d-goog

             reply	other threads:[~2017-04-04 18:07 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-04 18:07 Matthias Kaehlcke [this message]
2017-04-19 18:14 ` Matthias Kaehlcke
2017-04-19 20:48   ` Arnd Bergmann
2017-04-19 21:37     ` Matthias Kaehlcke
2017-04-20  8:45       ` Arnd Bergmann
2017-04-20 19:56         ` Matthias Kaehlcke

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