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SubjectRe: [PATCH] x86: Extend test_and_set_bit() test_and_clean_bit() to 64 bits in X86_64
On Thu, May 14, 2009 at 07:25:22AM -0700, H. Peter Anvin wrote:
> Andi Kleen wrote:
> >
> > Pretty much all the bit ops and a few other operations currently have
> > 2/4GB limits on x86-64. I don't think that's going to change.
> >
> > In the kernel nothing is ever that big continuously anyways.
> >
>
> Uhm, that *is* the problem at hand... specifically the bootmem map on
> multi-terabyte systems.

Well they have to fix a lot of more stuff then, when I did
all the inline assembler >2GB objects were a explicit non goal.
It also wouldn't surprise me if that wasn't true on other architectures too.

It would be better to just use open coded C for that case and avoid inline
assembler.

-Andi
--
ak@linux.intel.com -- Speaking for myself only.


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