From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx206.postini.com [74.125.245.206]) by kanga.kvack.org (Postfix) with SMTP id 9D30B6B0083 for ; Thu, 17 May 2012 05:53:14 -0400 (EDT) Date: Thu, 17 May 2012 10:51:24 +0100 From: Russell King Subject: Re: [RFC][PATCH 4/6] arm, mm: Convert arm to generic tlb Message-ID: <20120517095124.GN23420@flint.arm.linux.org.uk> References: <20110302175928.022902359@chello.nl> <20110302180259.109909335@chello.nl> <20120517030551.GA11623@linux-sh.org> <20120517093022.GA14666@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20120517093022.GA14666@arm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Catalin Marinas Cc: Paul Mundt , Peter Zijlstra , Andrea Arcangeli , Thomas Gleixner , Rik van Riel , Ingo Molnar , "akpm@linux-foundation.org" , Linus Torvalds , "linux-kernel@vger.kernel.org" , "linux-arch@vger.kernel.org" , "linux-mm@kvack.org" , Benjamin Herrenschmidt , David Miller , Hugh Dickins , Mel Gorman , Nick Piggin , Chris Metcalf , Martin Schwidefsky 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: -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org