Re: [PATCH 2/2] Convert PowerPC macro spin_event_timeout() toarchitecture independent macro
From: Timur Tabi
Date: Wed Jul 31 2013 - 19:56:10 EST
On Wed, Jul 31, 2013 at 2:16 AM, Stephen Boyd <sboyd@xxxxxxxxxxxxxx> wrote:
> What do you do here if jiffies aren't incrementing (i.e
> interrupts are disabled). The time_before() check won't work
> there and it would be nice if we were able to use this in such
> situations. I think powerpc gets around this by reading the
> hardware timer directly?
I believe that jiffies is always a global variable. It should behave
the same on PowerPC as on other architectures.
The answer to your question is that you should not use
spin_event_timeout() in interrupt context, because it yields.
(FYI, I'm the author of spin_event_timeout(), so please CC: me on all
changes to it)
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