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[2620:137:e000::3:5]) by mx.google.com with ESMTPS id g7-20020a056a0023c700b006902507d409si4502484pfc.174.2023.09.15.20.36.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Sep 2023 20:36:09 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:5 as permitted sender) client-ip=2620:137:e000::3:5; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=H9LvAtog; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::3:5 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by groat.vger.email (Postfix) with ESMTP id 0827980A222D; Fri, 15 Sep 2023 11:39:12 -0700 (PDT) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.10 at groat.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236685AbjIOSiD (ORCPT + 30 others); Fri, 15 Sep 2023 14:38:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41994 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236587AbjIOShX (ORCPT ); Fri, 15 Sep 2023 14:37:23 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B165210E6; Fri, 15 Sep 2023 11:37:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=NoYAPE+UO7xNrTZ3UFo3zibiwdFupzttBoXxylMj4Qw=; b=H9LvAtogpvwX8ITigBgif20y3d Ksa3CrrVI3uaFqgH46vcGpzQGIbqqcgmmazDLvlAPd3WywSfgjryFPPXaF/5s/4Ksm1o5DXsq6PHT d118mcjKIzIS1RtLFAt/4I2kRM0niTEAbsc1MW/RuESCl87qFg73uDcHMTGKkeUONBGbDyBj5jrsx b7tUYeKMv4Ax9ha9W5IXgD9GUjlHlk+FnXw2zD9DZkL6avroCIGOqicNVMtEulxTb6/tsGEDX+11x OQIhNrD9uxgZFfv2F5U8xcBzdADdQizHw/96XJotDdOexdkjT2PlWFuT773ZhaL83QnsJwAtKgnsI hEgaBaCw==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1qhDgk-00BMIy-3W; Fri, 15 Sep 2023 18:37:10 +0000 From: "Matthew Wilcox (Oracle)" To: linux-kernel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, torvalds@linux-foundation.org, Nicholas Piggin Subject: [PATCH 13/17] s390: Implement arch_xor_unlock_is_negative_byte Date: Fri, 15 Sep 2023 19:37:03 +0100 Message-Id: <20230915183707.2707298-14-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230915183707.2707298-1-willy@infradead.org> References: <20230915183707.2707298-1-willy@infradead.org> MIME-Version: 1.0 X-Spam-Status: No, score=-0.9 required=5.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on groat.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (groat.vger.email [0.0.0.0]); Fri, 15 Sep 2023 11:39:12 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1777163691915351783 X-GMAIL-MSGID: 1777163691915351783 Inspired by the s390 arch_test_and_clear_bit(), this will surely be more efficient than the generic one defined in filemap.c. Signed-off-by: Matthew Wilcox (Oracle) --- arch/s390/include/asm/bitops.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h index 2de74fcd0578..c467dffa8c12 100644 --- a/arch/s390/include/asm/bitops.h +++ b/arch/s390/include/asm/bitops.h @@ -201,6 +201,16 @@ static inline void arch___clear_bit_unlock(unsigned long nr, arch___clear_bit(nr, ptr); } +static inline bool arch_xor_unlock_is_negative_byte(unsigned long mask, + volatile unsigned long *ptr) +{ + unsigned long old; + + old = __atomic64_xor_barrier(mask, (long *)ptr); + return old & BIT(7); +} +#define arch_xor_unlock_is_negative_byte arch_xor_unlock_is_negative_byte + #include #include #include