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

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Message-ID: <519D0FF8.5080200@redhat.com>
Date:	Wed, 22 May 2013 14:35:36 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Stanislav Meduna <stano@...una.org>
CC:	Steven Rostedt <rostedt@...dmis.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>,
	"H. Peter Anvin" <hpa@...or.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 05/22/2013 02:21 PM, Stanislav Meduna wrote:
> On 22.05.2013 20:11, Steven Rostedt wrote:
>
>> Did you apply both patches? Without the first one, this one is
>> meaningless.
>
> Sure.
>
> BTW, back when I tried to pinpoint it I also tried adding
>    flush_tlb_page(vma, address)
> at the beginning of handle_pte_fault, which as I read should
> be basically the same. It did not not change anything.

I'm stumped.

If the Geode knows how to flush single TLB entries, it
should do that when flush_tlb_page is called.

If it does not know, it should throw an invalid instruction
exception, and not quietly complete the instruction without
doing anything.

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