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

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Message-ID: <1369315769.6828.198.camel@gandalf.local.home>
Date:	Thu, 23 May 2013 09:29:29 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Rik van Riel <riel@...hat.com>
Cc:	Stanislav Meduna <stano@...una.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	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 Thu, 2013-05-23 at 08:19 -0400, Rik van Riel wrote:

> We can add a bit in the architecture bits that
> we use to check against other CPU and system
> errata, and conditionally flush the whole TLB
> from __native_flush_tlb_single().

If we find that some CPUs have issues and others do not, and we can
determine this by checking the CPU type at run time, I would strongly
suggest using the jump_label infrastructure to do the branches. I know
this is early to suggest something like this, but I just wanted to put
it in your head ;-)

-- Steve


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