Re: [PATCH 1/3] acpi: add real mutex function calls

Peter Zijlstra
2008-07-21T09:15:03Z

On Mon, 2008-07-21 at 09:51 +0800, Zhao Yakui wrote:
> On Sat, 2008-07-19 at 11:16 -0700, Daniel Walker wrote:
> > Instead of re-using semaphores for the mutex operation, I've
> > added usage of the kernel mutex for the os mutex implementation.
> >
> What is the advantage that the kernel mutex is used for the ACPI mutex
> implementation instead of using semaphore?
> And it seems that too much ACPICA source code is touched.

You get help from lockdep, and also our goal is to fully eradicate
semaphore usage.