From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752366AbbHSQNI (ORCPT ); Wed, 19 Aug 2015 12:13:08 -0400 Received: from eu-smtp-delivery-143.mimecast.com ([207.82.80.143]:21011 "EHLO eu-smtp-delivery-143.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752329AbbHSQNF convert rfc822-to-8bit (ORCPT ); Wed, 19 Aug 2015 12:13:05 -0400 Date: Wed, 19 Aug 2015 17:13:01 +0100 From: Catalin Marinas To: Sarbojit Ganguly Cc: sharan.allur@samsung.com, vikram.m@samsung.com, "tglx@linutronix.de" , "mingo@redhat.com" , "peterz@infradead.org" , "Waiman.Long@hp.com" , "oleg@redhat.com" , "linux-kernel@vger.kernel.org" , "torvalds@linux-foundation.org" , raghavendra.kt@linux.vnet.ibm.com Subject: Re: [PATCH] arm: Adding support for atomic half word exchange Message-ID: <20150819161301.GJ24062@e104818-lin.cambridge.arm.com> References: <1842906637.213431439885869379.JavaMail.weblogic@ep2mlwas04b> MIME-Version: 1.0 In-Reply-To: <1842906637.213431439885869379.JavaMail.weblogic@ep2mlwas04b> User-Agent: Mutt/1.5.23 (2014-03-12) X-OriginalArrivalTime: 19 Aug 2015 16:13:01.0605 (UTC) FILETIME=[EBE1F550:01D0DA99] X-MC-Unique: vKmMza2wSvGyF-28U6Am0Q-1 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: 8BIT Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Aug 18, 2015 at 09:17:53AM +0100, Sarbojit Ganguly wrote: > > > Since 16 bit half word exchange was not there and MCS based qspinlock by Waiman's xchg_tail() requires an atomic exchange on a half word, here is a small modification to __xchg() code to support the exchange. > ARMv6 and lower does not have support for LDREXH, so we need to make sure things do not break when we're compiling on ARMv6. First of all, please wrap the text appropriately. Secondly, you need to cc the relevant maintainer and mailing list (try running ./scripts/get_maintainer.pl on this patch to get some hints). -- Catalin