Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760849Ab2EQJxM (ORCPT ); Thu, 17 May 2012 05:53:12 -0400 Received: from caramon.arm.linux.org.uk ([78.32.30.218]:37913 "EHLO caramon.arm.linux.org.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756049Ab2EQJxK (ORCPT ); Thu, 17 May 2012 05:53:10 -0400 Date: Thu, 17 May 2012 10:51:24 +0100 From: Russell King 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 Subject: Re: [RFC][PATCH 4/6] arm, mm: Convert arm to generic tlb Message-ID: <20120517095124.GN23420@flint.arm.linux.org.uk> Mail-Followup-To: Catalin Marinas , 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 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> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 801 Lines: 18 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/