linux-kernel - Re: [RFC][PATCH 4/6] arm, mm: Convert arm to generic tlb

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Date:	Wed, 9 Mar 2011 15:16:07 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rik van Riel <riel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Mel Gorman <mel@....ul.ie>, Nick Piggin <npiggin@...nel.dk>,
	Russell King <rmk@....linux.org.uk>,
	Chris Metcalf <cmetcalf@...era.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: [RFC][PATCH 4/6] arm, mm: Convert arm to generic tlb

Hi Peter,

On 2 March 2011 17:59, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> --- linux-2.6.orig/arch/arm/include/asm/tlb.h
> +++ linux-2.6/arch/arm/include/asm/tlb.h
[...]
> +__pte_free_tlb(struct mmu_gather *tlb, pgtable_t pte, unsigned long addr)
>  {
>        pgtable_page_dtor(pte);
> -       tlb_add_flush(tlb, addr);
>        tlb_remove_page(tlb, pte);
>  }

I think we still need a tlb_track_range() call here. On the path to
pte_free_tlb() (for example shift_arg_pages ... free_pte_range) there
doesn't seem to be any code setting the tlb->start/end range. Did I
miss anything?

Thanks.

-- 
Catalin
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