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SubjectRe: [RFC GIT PULL] softirq: Consolidation and stack overrun fix
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On Sun, 2013-09-22 at 14:39 +1000, Benjamin Herrenschmidt wrote:
> How do you do your per-cpu on x86 ? On powerpc we struggle because we
> try to dedicate a register (r13) to this PACA (the per-cpu offset hangs
> off it), but we constantly run into issues where gcc copies r13 to
> another register and then indexes off that, even accross
> preempt_enable/disable sections, or worst such as saving/restoring from
> the stack. We can't seem to get the compiler to treat it appropriately
> as volatile.

Also, do you have a half-decent way of getting to per-cpu from asm ?

Cheers,
Ben.




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