From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752688AbdJFNew (ORCPT ); Fri, 6 Oct 2017 09:34:52 -0400 Received: from usa-sjc-mx-foss1.foss.arm.com ([217.140.101.70]:33570 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752188AbdJFNem (ORCPT ); Fri, 6 Oct 2017 09:34:42 -0400 From: Will Deacon To: linux-kernel@vger.kernel.org Cc: linux-arm-kernel@lists.infradead.org, Jeremy.Linton@arm.com, peterz@infradead.org, mingo@redhat.com, longman@redhat.com, boqun.feng@gmail.com, paulmck@linux.vnet.ibm.com, Will Deacon Subject: [PATCH v2 0/5] Switch arm64 over to qrwlock Date: Fri, 6 Oct 2017 14:34:37 +0100 Message-Id: <1507296882-18721-1-git-send-email-will.deacon@arm.com> X-Mailer: git-send-email 2.1.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi all, This is version two of the patches I posted yesterday: http://lists.infradead.org/pipermail/linux-arm-kernel/2017-October/534666.html I'd normally leave it longer before posting again, but Peter had a good suggestion to rework the layout of the lock word, so I wanted to post a version that follows that approach. I've updated my branch if you're after the full patch stack: git://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git qrwlock As before, all comments (particularly related to testing and performance) welcome! Cheers, Will --->8 Will Deacon (5): kernel/locking: Use struct qrwlock instead of struct __qrwlock locking/atomic: Add atomic_cond_read_acquire kernel/locking: Use atomic_cond_read_acquire when spinning in qrwlock arm64: locking: Move rwlock implementation over to qrwlocks kernel/locking: Prevent slowpath writers getting held up by fastpath arch/arm64/Kconfig | 17 ++++ arch/arm64/include/asm/Kbuild | 1 + arch/arm64/include/asm/spinlock.h | 164 +------------------------------- arch/arm64/include/asm/spinlock_types.h | 6 +- include/asm-generic/atomic-long.h | 3 + include/asm-generic/qrwlock.h | 20 +--- include/asm-generic/qrwlock_types.h | 15 ++- include/linux/atomic.h | 4 + kernel/locking/qrwlock.c | 83 +++------------- 9 files changed, 58 insertions(+), 255 deletions(-) -- 2.1.4