Re: [PATCH 2/2] Convert PowerPC macro spin_event_timeout() to architectureindependent macro

From: Timur Tabi
Date: Wed Jul 31 2013 - 20:20:36 EST

On 07/31/2013 07:16 PM, Stephen Boyd wrote:
> cpu_relax() is usually just a compiler barrier or an instruction hint to
> the cpu that it should cool down because we're spinning in a tight loop.
> It certainly shouldn't be calling into the scheduler.

Ah yes, I remember now. So it does seem that if we can fix the problem
of non-incrementing 'jiffies', then this macro can be used in interrupts.

Of course, that assumes that spinning in interrupt context is a good
idea to begin with. Maybe we shouldn't be encouraging it?

>> > FYI, you might want to look at the code reviews for spin_event_timeout()
>> > on the linuxppc-dev mailing list, back in March 2009.
>> >
> Sure. Any pointers? Otherwise I'll go digging around the archives.

Timur Tabi
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