linux-kernel - Re: [PATCH 4/4] acpi: semaphore removal

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Date:	Tue, 26 Aug 2008 13:50:51 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Daniel Walker <dwalker@...sta.com>
Cc:	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Len Brown <len.brown@...el.com>,
	Robert Moore <robert.moore@...el.com>,
	linux-acpi@...r.kernel.org
Subject: Re: [PATCH 4/4] acpi: semaphore removal

On Tue, Aug 26, 2008 at 12:30:46PM -0700, Daniel Walker wrote:
> On Tue, 2008-08-26 at 13:13 -0600, Matthew Wilcox wrote:
> > On Tue, Aug 26, 2008 at 11:59:49AM -0700, Daniel Walker wrote:
> > > The semaphore usage in ACPI is more like completions. The ASL
> > 
> > Huh?  They are semaphores.  They're not 'more like completions' at all.
> 
> You can clearly make a completion out of a semaphore, but we have a
> completion API .. ACPI is using locked semaphores, and essentially
> re-making completions with the semaphore API..

What makes you think that?

executer/excreate.c:    status = acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0,
executer/exsystem.c:        acpi_os_create_semaphore(ACPI_NO_UNIT_LIMIT, 0, &temp_semaphore);
namespace/nsaccess.c:                                       acpi_os_create_semaphore(1, 0,
osl.c:acpi_os_create_semaphore(u32 max_units, u32 initial_units, acpi_handle * handle)

All users set 'initial_units' to 0.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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