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Message-ID: <48750D96.7030407@linux-foundation.org> Date: Wed, 09 Jul 2008 14:12:22 -0500 From: Christoph Lameter <cl@...ux-foundation.org> To: Jeremy Fitzhardinge <jeremy@...p.org> CC: Mike Travis <travis@....com>, Ingo Molnar <mingo@...e.hu>, Andrew Morton <akpm@...ux-foundation.org>, "Eric W. Biederman" <ebiederm@...ssion.com>, "H. Peter Anvin" <hpa@...or.com>, Jack Steiner <steiner@....com>, linux-kernel@...r.kernel.org Subject: Re: [RFC 00/15] x86_64: Optimize percpu accesses Jeremy Fitzhardinge wrote: > No, they don't help at all, because they convert X_pda(Y) (which doesn't > exist) into x86_X_percpu(pda.Y) (which also doesn't exist). They don't > remove any #ifdef CONFIG_X86_64's. If you're going to tromp all over > the source, you may as well do the most useful thing in the first step. Well they help in the sense that the patches get rid of the special X_pda(Y) operations. x86_X_percpu will then exist under 32 bit and 64 bit. What is remaining is the task to rename pda.Y -> Z in order to make variable references the same under both arches. Presumably the Z is the corresponding 32 bit variable. There are likely a number of cases where the transformation is trivial if we just identify the corresponding 32 bit equivalent. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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