svn commit: r290613 - head/sys/compat/linuxkpi/common/include/linux

[Bruce Evans]

On Tue, 10 Nov 2015, Justin Hibbits wrote:

> On Tue, Nov 10, 2015 at 9:42 AM, Conrad Meyer <cem at freebsd.org> wrote:
>> ...
>> Given that intptr_t exists in our implementation and is a signed
>> integer type, I see no reason why intmax_t could possibly not
>> represent any such value.  Same argument for the unsigned variants.
>
> I may be wrong on this, but I *think* uintptr_t/intptr_t are required
> to be *precisely* the same size as a pointer, which explains why you
> can't cast directly from uintmax_t on 32-bit architectures.

Good compilers use the size for a simple portability check.  They
should also complain if the types are different but have the same size,
as is done for int vs long format mismatches on i386.

Bruce