Re: [RFC][PATCH] introduce ptr_diff()

Al Viro
2010-08-20T12:12:43Z

On Thu, Aug 19, 2010 at 02:59:57PM +0200, Andi Kleen wrote:
> > If so, the warning seems valid as sizeof(struct page) is probably not
> > (always) a power of 2. On a native build on x86_64 it is 56 bytes
> > hereover.
> > Hmm ....
>
>
> gcc just generats a mull with inverted value. mull is cheap on any
> reasonable CPU.

Depends on gcc version.

> Please fix sparse.

Frankly, I'd rather stop crapping -Wall into its arguments; there's
a reason why that check is optional and it's *not* defaulting to
on in sparse.