On 07/10/2013 01:02:19 AM, Tiejun Chen wrote:
We should ensure the preemption cannot occur while calling get_paca()
insdide hard_irq_disable(), otherwise the paca_struct may be the
wrong one just after. And btw, we may update timing stats in this
case.
The soft-ee mechanism depends on accessing the PACA directly via r13 to
avoid this. We probably should be using inline asm to read was_enabled
rather than hoping the compiler doesn't do anything silly.
Plus what Alex said, regarding this patch specifically.
-Scott
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