Re: type safe lists (was Re: PATCH: type safe(r) list_entry repacement: generic_out_cast)

From: Linus Torvalds (torvalds@transmeta.com)
Date: Wed Jul 24 2002 - 16:00:05 EST


In article <p73d6tdtg2s.fsf@oldwotan.suse.de>, Andi Kleen <ak@suse.de> wrote:
>>
>> As long as your pointers are 32bit this seems to be ok. But on
>> 64bit implementations pointers are not (unsigned long) so this cast
>> seems to be wrong.
>
>A pointer fits into unsigned long on all 64bit linux ports.
>The kernel very heavily relies on that.

Not just the kernel, afaik. I think it's rather tightly integrated into
gcc internals too (ie pointers are eventually just converted to SI
inside the compiler, and making a non-SI pointer would be hard).

                        Linus
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