Linus Torvalds writes: (Summary) On Thu, Oct 5, 2017 at 1:57 PM, Al Viro <viro@zeniv.linux.org.uk> Except you shouldn't do
if (kbuf->bsize != (u32)kbuf->bsize)
you should do something like
#define FITS_IN(x,y) ({ typeof x __x = (x); typeof y __y = __x;
__x == __y; })
and then do
if (!FITS_IN(kbuf->bsize, ubuf->bsize)) ...
because there is nothing that specifies that the ubuf size of all
fields has to be 32 bits.
But yes,m either you need to then special-case that crazy all-ones
value, or just fix hugetlbfs to not use crazy crap.