linux-kernel - Re: linux-next: build failure after merge of the tip tree

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Date:	Mon, 20 Jan 2014 16:39:45 -0500
From:	Len Brown <lenb@...nel.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, linux-next@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the tip tree

> As a side note, at minimum the semantic and compatibility difference
> needs to be _very_ clearly present in the naming. Something like
> mwait_old_() or mwait_core2_(). That way such dependencies and
> assumptions don't get lost in code restructuring, etc.

Agreed.
We started with mwait_idle() -- which was erroneously removed
and is now being restored under it original name.

The "new" function is mwait_idle_with_hints() -- which uses
the additional hints that were not available w/ the original MWAIT instruction.
Where "new" is Core Duo and later -- all the processor that can use
MWAIT for C-states deeper than C1.

Len Brown, Intel Open Source Technology Center
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