linux-kernel - Re: [PATCH] x86: Clean up files of Intel Processor Trace

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Message-ID: <CAB7JpEFWx52WwFYTkExRoY1aF4w1v=b8Ad2c5=6SFL82oQ4G2w@mail.gmail.com>
Date:	Mon, 3 Aug 2015 12:44:13 +0300
From:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Takao Indoh <indou.takao@...fujitsu.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	x86@...nel.org
Subject: Re: [PATCH] x86: Clean up files of Intel Processor Trace

On 3 August 2015 at 12:08, Peter Zijlstra <peterz@...radead.org> wrote:
> On Mon, Aug 03, 2015 at 12:03:13PM +0300, Alexander Shishkin wrote:
>> Takao Indoh <indou.takao@...fujitsu.com> writes:
>
>> Even though TOPA_SHIFT happens to be the same as PAGE_SHIFT, it is a
>> property of a separate hardware block, not mmu. PAGE_SHIFT is 12, but
>> 12 is not always PAGE_SHIFT.
>
> PAGE_SHIFT is _always_ 12 on x86. Changing that will require changing
> the page table format, a rather unlikely thing to go happen.

Of course. Yet that doesn't justify turning every 12 into PAGE_SHIFT
is what I'm saying.

Oh, look, it's PAGE_SHIFT o'clock on x86, time for lunch. :)

Regards,
--
Alex
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