linux-kernel - Re: [PATCH v2 2/4] x86, mwaitt: make delay method configurable

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Message-ID: <20150609093120.GS3644@twins.programming.kicks-ass.net>
Date:	Tue, 9 Jun 2015 11:31:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Borislav Petkov <bp@...e.de>
Cc:	Huang Rui <ray.huang@....com>,
	Andy Lutomirski <luto@...capital.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <lenb@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	Fengguang Wu <fengguang.wu@...el.com>,
	Aaron Lu <aaron.lu@...el.com>,
	Suravee Suthikulanit <suravee.suthikulpanit@....com>,
	Tony Li <tony.li@....com>, Ken Xue <ken.xue@....com>
Subject: Re: [PATCH v2 2/4] x86, mwaitt: make delay method configurable

On Tue, Jun 09, 2015 at 11:05:43AM +0200, Borislav Petkov wrote:
> And we did talk about this already in the last review. You guys want to
> drop all those kernel parameters and use MWAITX delay by default when:
> 
> 1. HW supports MWAITX
> 
> *and*
> 
> 2. delay fits in u32.

No, that 2. is just retarded, see my other email. Always use mwaitx,
just call it multiple times if you want to wait longer.
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