Linus Torvalds writes: (Summary) This is still too ugly to live.
What *may* be acceptable is if architectures defined something like this: What *may* be acceptable is if architectures defined something like this: x86:
x86:
What *may* be acceptable is if architectures defined something like this: What *may* be acceptable is if architectures defined something like this: x86:
x86:
/* Little endian registers - low bits first, no padding for odd
register numbers necessary */
#define COMPAT_ARG_64BIT(x) unsigned int x##_lo, unsigned int x##_hi
#define COMPAT_ARG_64BIT_ODD(x) COMPAT_ARG_64BIT(x)
ppc BE:
/* Big-endian registers - high bits first, odd argument pairs
padded up to the next even register */
#define COMPAT_ARG_64BIT(x) unsigned int x##_hi, unsigned int x##_lo
#define COMPAT_ARG_64BIT_ODD(x) unsigned int x##_padding,
COMPAT_ARG_64BIT(x)
and then we can do
COMPAT_SYSCALL_DEFINE5(readahead, int, fd,
COMPAT_ARG_64BIT_ODD(off), compat_size_t, count)
{
return do_readahead(fd, off_lo + ((u64)off_hi <<