Re: [PATCH] RDMA/siw: Fix compiler warnings on 32-bit due to u64/pointer abuse
From: Geert Uytterhoeven
Date: Tue Aug 27 2019 - 14:00:08 EST
On Tue, Aug 27, 2019 at 7:46 PM Al Viro <viro@xxxxxxxxxxxxxxxxxx> wrote:
> On Tue, Aug 27, 2019 at 07:29:52PM +0200, Geert Uytterhoeven wrote:
> > On Tue, Aug 27, 2019 at 4:17 PM David Laight <David.Laight@xxxxxxxxxx> wrote:
> > > From: Geert Uytterhoeven
> > > > Sent: 19 August 2019 18:15
> > > ...
> > > > > I think a cast to unsigned long is rather more common.
> > > > >
> > > > > uintptr_t is used ~1300 times in the kernel.
> > > > > I believe a cast to unsigned long is much more common.
> > > >
> > > > That is true, as uintptr_t was introduced in C99.
> > > > Similarly, unsigned long was used before size_t became common.
> > > >
> > > > However, nowadays size_t and uintptr_t are preferred.
> > >
> > > Isn't uintptr_t defined by the same standard as uint32_t?
> > I believe so.
> It sure as hell is not. C99 18.104.22.168:
> The following type designates an unsigned integer type with the property that any valid
> pointer to void can be converted to this type, then converted back to pointer to void,
> and the result will compare equal to the original pointer:
> IOW, it's "large enough to represent pointers".
I did not say the two types are identical, and can be used interchangeable.
Both types are defined (at least) in
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds