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

[Linus Torvalds]

In article <[e-mail]>, Andi Kleen  <[e-mail]> 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