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Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1p7IJo-000r9D-BN; Mon, 19 Dec 2022 15:44:44 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id D8385300193; Mon, 19 Dec 2022 16:44:33 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id C82F7201A8ADD; Mon, 19 Dec 2022 16:44:33 +0100 (CET) Date: Mon, 19 Dec 2022 16:44:33 +0100 From: Peter Zijlstra To: Linus Torvalds Cc: Nathan Chancellor , Uros Bizjak , x86@kernel.org, willy@infradead.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, aarcange@redhat.com, kirill.shutemov@linux.intel.com, jroedel@suse.de Subject: Re: [PATCH 11/13] x86_64: Remove pointless set_64bit() usage Message-ID: References: <20221022111403.531902164@infradead.org> <20221022114425.168036718@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: CAACC40013 X-Stat-Signature: 83ycn7r6xuk8azhjyc8hsnm3qo1zjrwp X-Rspam-User: X-HE-Tag: 1671464676-164008 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Fri, Nov 04, 2022 at 10:15:08AM -0700, Linus Torvalds wrote: > On Fri, Nov 4, 2022 at 9:01 AM Peter Zijlstra wrote: > > > > So cmpxchg_double() does a cmpxchg on a double long value and is > > currently supported by: i386, x86_64, arm64 and s390. > > > > On all those, except i386, two longs are u128. > > > > So how about we introduce u128 and cmpxchg128 -- then it directly > > mirrors the u64 and cmpxchg64 usage we already have. It then also > > naturally imposses the alignment thing. > > Ack Out now: https://lkml.kernel.org/r/20221219153525.632521981@infradead.org