linux-kernel - Re: [RFC PATCH] x86: Move away from /dev/cpu/*/msr

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Message-ID: <CAJvTdK=pqSGw6atZn-giqxg4nd-DLTdf_wEhiC3VWGtDYLnUjg@mail.gmail.com>
Date:	Wed, 15 Jun 2016 13:42:41 -0400
From:	Len Brown <lenb@...nel.org>
To:	Borislav Petkov <bp@...en8.de>
Cc:	lkml <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Thomas Renninger <trenn@...e.com>,
	Kan Liang <kan.liang@...el.com>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Len Brown <len.brown@...el.com>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [RFC PATCH] x86: Move away from /dev/cpu/*/msr

> Well, since the utility is part of tools/, it goes with the kernel
> version. Just like perf.
>
> Or are you dying to be able to use new tool on old kernels?

Yes.  Enterprise customers use old kernels.  They need
at least a snapshot of the utility that works w/o the API update.
-- 
Len Brown, Intel Open Source Technology Center