linux-kernel - Re: [PATCH] mm: fix up a spurious page fault whenever it happens

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Message-ID: <519E53FB.7060307@zytor.com>
Date:	Thu, 23 May 2013 10:38:03 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	Rik van Riel <riel@...hat.com>,
	Stanislav Meduna <stano@...una.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-rt-users@...r.kernel.org" <linux-rt-users@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Hai Huang <hhuang@...hat.com>
Subject: Re: [PATCH] mm: fix up a spurious page fault whenever it happens

On 05/23/2013 10:36 AM, Steven Rostedt wrote:
> On Thu, 2013-05-23 at 10:24 -0700, H. Peter Anvin wrote:
>> On 05/23/2013 08:27 AM, Steven Rostedt wrote:
>>> On Thu, 2013-05-23 at 08:06 -0700, H. Peter Anvin wrote:
>>>
>>>> We don't even need the jump_label infrastructure -- we have
>>>> static_cpu_has*() which actually predates jump_label although it uses
>>>> the same underlying ideas.
>>>
>>> Ah right. I wonder if it would be worth consolidating a lot of these
>>> "modifying of code" infrastructures. Which reminds me, I need to update
>>> text_poke() to do things similar to what ftrace does, and get rid of the
>>> stop machine code.
>>>
>>
>> Well, static_cpu_has*() just uses the alternatives infrastructure.
> 
> And as it's a boot time change only, it's not quite in the category of
> jump_labels and function tracing.
> 

Right.

	-hpa


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