Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753336AbbHCOgj (ORCPT ); Mon, 3 Aug 2015 10:36:39 -0400 Received: from smtprelay.synopsys.com ([198.182.60.111]:60021 "EHLO smtprelay.synopsys.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1752636AbbHCOgh (ORCPT ); Mon, 3 Aug 2015 10:36:37 -0400 From: Vineet Gupta To: Peter Zijlstra CC: , Vineet Gupta Subject: [PATCH v2 0/6] ARC: spinlocks/atomics rework Date: Mon, 3 Aug 2015 20:06:02 +0530 Message-ID: <1438612568-28265-1-git-send-email-vgupta@synopsys.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.12.197.191] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1674 Lines: 42 The PREFETCHW workaround for llock/scond livelock was not sufficient after all and we had to do some work there. Extending testing of quad core FPGA builds shows things pretty stable, whereas w/o patches some of the LTP tests (shm_open/23-1) would cause the system to go bonkers. Changes since v1* (all thx to Peter Zijlstra) * 3/6 - updated changelog * 4/6 - updated changelog arch_write_unlock() need not use LLOCK/SCOND * 5/6 - Conditional implementation of SCOND_FAIL_RETRY* in atomics (reduced dup) Handle overflow of delay counter in SCOND_FAIL_RETRY_ASM * 6/6 - updated changelog [*] http://lkml.kernel.org/r/1438596188-10875-1-git-send-email-vgupta@synopsys.com Vineet Gupta (6): Revert "ARCv2: STAR 9000837815 workaround hardware exclusive transactions livelock" ARC: refactor atomic inline asm operands with symbolic names ARC: LLOCK/SCOND based spin_lock ARC: LLOCK/SCOND based rwlock ARCv2: spinlock/rwlock/atomics: Delayed retry of failed SCOND with exponential backoff ARCv2: spinlock/rwlock: Reset retry delay when starting a new spin-wait cycle arch/arc/Kconfig | 5 + arch/arc/include/asm/atomic.h | 79 +++-- arch/arc/include/asm/spinlock.h | 539 +++++++++++++++++++++++++++++++++- arch/arc/include/asm/spinlock_types.h | 2 + arch/arc/kernel/setup.c | 4 + 5 files changed, 591 insertions(+), 38 deletions(-) -- 1.9.1 -- 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/