linux/include
Hans Verkuil d55875f5d5 include/asm-generic/ioctl.h: fix _IOC_TYPECHECK sparse error
When running sparse over drivers/media/v4l2-core/v4l2-ioctl.c I get these
errors:

  drivers/media/v4l2-core/v4l2-ioctl.c:2043:9: error: bad integer constant expression
  drivers/media/v4l2-core/v4l2-ioctl.c:2044:9: error: bad integer constant expression
  drivers/media/v4l2-core/v4l2-ioctl.c:2045:9: error: bad integer constant expression
  drivers/media/v4l2-core/v4l2-ioctl.c:2046:9: error: bad integer constant expression

etc.

The root cause of that turns out to be in include/asm-generic/ioctl.h:

#include <uapi/asm-generic/ioctl.h>

/* provoke compile error for invalid uses of size argument */
extern unsigned int __invalid_size_argument_for_IOC;
#define _IOC_TYPECHECK(t) \
        ((sizeof(t) == sizeof(t[1]) && \
          sizeof(t) < (1 << _IOC_SIZEBITS)) ? \
          sizeof(t) : __invalid_size_argument_for_IOC)

If it is defined as this (as is already done if __KERNEL__ is not defined):

  #define _IOC_TYPECHECK(t) (sizeof(t))

then all is well with the world.

This patch allows sparse to work correctly.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2014-06-06 16:08:13 -07:00
..
acpi Merge branch 'acpi-video' 2014-06-03 23:12:37 +02:00
asm-generic include/asm-generic/ioctl.h: fix _IOC_TYPECHECK sparse error 2014-06-06 16:08:13 -07:00
clocksource
crypto
drm
dt-bindings ARM: SoC devicetree updates for 3.16 2014-06-02 16:34:00 -07:00
keys
kvm
linux idr: reorder the fields 2014-06-06 16:08:13 -07:00
math-emu
media [media] adv7604: Add missing include to linux/types.h 2014-05-25 12:48:47 -03:00
memory
misc
net Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial into next 2014-06-04 08:50:34 -07:00
pcmcia
ras
rdma
rxrpc
scsi
sound ASoC: Final updates for v3.16 2014-06-03 11:51:14 +02:00
target
trace mm/compaction: do not count migratepages when unnecessary 2014-06-04 16:54:07 -07:00
uapi Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media into next 2014-06-04 14:24:30 -07:00
video
xen Merge branch 'for-3.16/drivers' of git://git.kernel.dk/linux-block into next 2014-06-02 13:57:01 -07:00
Kbuild