linux-kernel - Re: [PATCH] Replace completions with semaphores

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Message-ID: <20080415170556.GA16417@elte.hu>
Date:	Tue, 15 Apr 2008 19:05:56 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Bart Van Assche <bart.vanassche@...il.com>,
	Roland Dreier <rdreier@...co.com>,
	Matthew Wilcox <matthew@....cx>,
	Ingo Oeser <ioe-lkml@...eria.de>,
	Daniel Walker <dwalker@...sta.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Replace completions with semaphores

* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> Why have "generic semaphores" at all, if we want to get rid of them?

i very much agree with the "get rid of semaphores" argument - the reason 
why i initially supported the "move to generic semaphores" step was 
because i saw it basically as the precursor to full removal: it is the 
removal of semaphores from all architectures - with a small generic 
compatibility wrapper to handle the remaining few uses of semaphores.

i got thoroughly surprised by the "increase the scope of semaphores" 
angle to the patchset though, and in hindsight i'd rather see neither of 
those generalizations and see semaphores die a slow but sure natural 
death than to see their prolongation :-/

perhaps the 'remove all semaphores from all architectures' privilege 
should be a final step kept for the lucky guy who manages to get rid of 
the last remaining semaphore use in the kernel? :)

	Ingo
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