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

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Message-ID: <20120517093921.GB14666@arm.com>
Date:	Thu, 17 May 2012 10:39:21 +0100
From:	Catalin Marinas <catalin.marinas@....com>
To:	Paul Mundt <lethal@...ux-sh.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	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" <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-mm@...ck.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

On Thu, May 17, 2012 at 10:30:23AM +0100, Catalin Marinas wrote:
> Another minor thing is that on newer ARM processors (Cortex-A15) we
> need the TLB shootdown even on UP systems, so tlb_fast_mode should
> always return 0. Something like below (untested):
> 
> 
> diff --git a/arch/arm/include/asm/tlb.h b/arch/arm/include/asm/tlb.h
> index 37dbce9..8e79689 100644
> --- a/arch/arm/include/asm/tlb.h
> +++ b/arch/arm/include/asm/tlb.h
> @@ -23,6 +23,10 @@
>  
>  #include <linux/pagemap.h>
>  
> +#ifdef CONFIG_CPU_32v7
> +#define tlb_fast_mode	(0)
> +#endif
> +
>  #include <asm-generic/tlb.h>
>  
>  #else /* !CONFIG_MMU */

This hunk should have been a few lines down for the CONFIG_MMU case.

-- 
Catalin
--
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