Hi!
Here is another sparse error that I get when running sparse over
drivers/media/v4l2-core/v4l2-ioctl.c:
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:
#define _IOC_TYPECHECK(t) (sizeof(t))
then all is well with the world.
I can patch v4l2-ioctl.c to redefine _IOC_TYPECHECK if __CHECKER__ is defined, but
shouldn't sparse understand this instead? There was a similar situation with
ARRAY_SIZE in the past that sparse now understands.
Regards,
Hans
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