Hi Al, 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 7.18.1.4: > > 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: > uintptr_t > > 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 https://pubs.opengroup.org/onlinepubs/009695399/basedefs/stdint.h.html Gr{oetje,eeting}s, Geert -- 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
