From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Tue, 13 Dec 2005 08:58:35 +0100 From: Andi Kleen Subject: Re: [PATCH 1/19] MUTEX: Introduce simple mutex implementation Message-ID: <20051213075835.GZ15804@wotan.suse.de> References: <20051212161944.3185a3f9.akpm@osdl.org> <20051213075441.GB6765@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20051213075441.GB6765@elte.hu> To: Ingo Molnar Cc: Andrew Morton , David Howells , torvalds@osdl.org, hch@infradead.org, arjan@infradead.org, matthew@wil.cx, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org List-ID: > - i introduced a 'type-sensitive' macro wrapper that switches down() > (and the other APIs) to either to the assembly variant (if the > variable's type is struct compat_semaphore), or switches it to the new > generic mutex (if the type is struct semaphore), at build-time. There > is no runtime overhead due to this build-time-switching. Didn't that drop compatibility with 2.95? The necessary builtins are only in 3.x. Not that I'm not in favour - I would like to use C99 everywhere and it would get of the ugly spinlock workaround for i386 and x86-64 doesn't support earlier compilers anyways - but others might not agree. -Andi