On 05/30/2010 10:03 AM, Borislav Petkov wrote:
> Obviously UML cannot stomach callee reg-saving trickery
> introduced with d61931d89be506372d01a90d1755f6d0a9fafe2d (x86:
> Add optimized popcnt variants) and oopses during boot:
> http://marc.info/?l=linux-kernel&m=127522065202435&w=2
>
> Go ahead and fall back to the software hweight* routines on UML.
I actually don't understand why UML can't stomach that... it would work
exactly the same in userspace as in kernel space. The only thing that I
can think of is if UML overrides the CFLAGS including the per-file
CFLAGS, but that would seem to cause all kinds of other issues.
I would also be a lot happier if this was handled in
<asm/arch_hweight.h> than in <asm/bitops.h>. Finally, if UML really
can't handle this, then ARCH_HWEIGHT_CFLAGS should be disabled on UML.
This bothers me, because it really feels like something is fundamentally
broken in UML tryingto track the upstream architecture, and this is just
a bandage.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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