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

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Message-ID: <20120517095124.GN23420@flint.arm.linux.org.uk>
Date:	Thu, 17 May 2012 10:51:24 +0100
From:	Russell King <rmk@....linux.org.uk>
To:	Catalin Marinas <catalin.marinas@....com>
Cc:	Paul Mundt <lethal@...ux-sh.org>,
	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>,
	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):

No Catalin, we need this for virtually all ARMv7 CPUs whether they're UP
or SMP, not just for A15, because of the speculative prefetch which can
re-load TLB entries from the page tables at _any_ time.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:
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