linux-kernel - Re: [PATCH] x86: skip delays during SMP initialization similar to Xen

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Message-ID: <CAJvTdKkO+5DG83bTY+rD294q2ZechPLs384kbL6oz8rhLyPTOg@mail.gmail.com>
Date:	Wed, 6 May 2015 21:27:38 -0400
From:	Len Brown <lenb@...nel.org>
To:	Ingo Molnar <mingo2.kernel.org@...il.com>
Cc:	Jan H. Schönherr <jschoenh@...zon.de>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Anthony Liguori <aliguori@...zon.com>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, Tim Deegan <tim@....org>,
	Gang Wei <gang.wei@...el.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] x86: skip delays during SMP initialization similar to Xen

> So I really like this, as it nicely side-steps the 'when should we do
> the legacy delays' issue by flagging on x2apic support.
>
> If anyone has objections, please holler.

We should have no delays even for many processors that lack x2apic.

Len Brown, Intel Open Source Technology Center
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