Re: [PATCH 3/3] cpuidle: Using the wake_up_all_idle_cpus() to wake up all idle cpus

[Peter Zijlstra]

On Thu, Sep 04, 2014 at 01:39:38PM +0000, Liu, Chuansheng wrote:
> > So IIUC, kick_all_cpus_sync is a broken function, right ?

> kick_all_cpus_sync has other callers, and those other callers want the
> old behavior.  I think this should be a new function.

Correct, things like arch/powerpc/mm/pgtable_64.c:pmdp_clear_flush()
really want the old behaviour. It basically uses
local_irq_disable()/local_irq_enable() vs kick_all_cpus_sync() as a RCU
like serialization primitive.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/