Messages in this thread | | | Date | Sun, 17 Feb 2013 19:17:09 +0100 | Subject | Re: Debugging Thinkpad T430s occasional suspend failure. | From | Frederic Weisbecker <> |
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2013/2/17 Linus Torvalds <torvalds@linux-foundation.org>: > On Sun, Feb 17, 2013 at 7:11 AM, Frederic Weisbecker <fweisbec@gmail.com> wrote: >> >> preempt_value_in_interrupt() looks buggy in your patch: it makes >> invoke_softirq() returning if (val & HARDIRQ_MASK). But that's always >> true since you have moved further the sub_preempt_count(IRQ_EXIT) >> further. > > No, that's not it. The value hasn't been written back yet, but it already did: > > + int offset = IRQ_EXIT_OFFSET; > + int count = preempt_count() - offset; > > so the 'count' has the IRQ_EXIT_OFFSET already subtracted. So no, > HARDIRQ_MASK is *not* always set.
Ah right. I was confused.
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