On Sat, 2005-04-09 at 06:38 +0200, Ingo Molnar wrote:
> * Luck, Tony <[email protected]> wrote:
>
> > >tested on x86, and all other arches should work as well, but if an
> > >architecture has irqs-off assumptions in its switch_to() logic
> > >it might break. (I havent found any but there may such assumptions.)
> >
> > The ia64_switch_to() code includes a section that can change a pinned
> > MMU mapping (when the stack for the new process is in a different
> > granule from the stack for the old process). [...]
>
> thanks - updated patch below. Any other architectures that switch the
> kernel stack in a nonatomic way? x86/x64 switches it atomically.
ppc64 already has a local_irq_save/restore in switch_to, around the low
level asm bits, so it should be fine.
Ben.
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