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Fri, 14 Feb 2025 11:55:16 -0800 (PST) MIME-Version: 1.0 References: <20250213191457.12377-1-ubizjak@gmail.com> <04adffd9-2900-4cdb-a557-1c486a87b522@intel.com> In-Reply-To: From: Uros Bizjak Date: Fri, 14 Feb 2025 20:55:09 +0100 X-Gm-Features: AWEUYZndtUFuHUobZ9uYTlaAdtqql4J2p04GR3tREOBJhVdZI8n7MmcYI8IZAjo Message-ID: Subject: Re: [PATCH RESEND 1/2] x86/locking: Use ALT_OUTPUT_SP() for percpu_{,try_}cmpxchg{64,128}_op() To: "Christoph Lameter (Ampere)" Cc: Dave Hansen , x86@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , Dennis Zhou , Tejun Heo , "Peter Zijlstra (Intel)" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 8CB4940008 X-Stat-Signature: t784phwg6tcc6tdnpqikrhzy1b4xea9q X-HE-Tag: 1739562920-447893 X-HE-Meta: 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 MwE0K47e f+17u+dMJjX71AJDw3ap+4f04T2NYvaqMrQ9Vp/bZQatjus+atpMlpn2tzw1IUbZYTOspyxmvMwNp4Z6dAj1KdSrWOZyTIMDc4/bDFIc/VRYslqSvoOLa7aqB0MqeTPhOplVlQym/OwqGowxeXtUlu1tKz6ueUva4M0DqzR9Xxrrpd1ElWLlML2QONPZQ7Ds633VoRF0GAhNMG37CQfEkAB8UXOhs4J5TiXaJODy5xrBUxhXxS63nTQcQdEFhyHGCvogNsGLN5EFBLHV1mQExWIjWauKtEiY1dUnXbV1Rg6BsQVS+sQNMeuMjF2kWbiefe3jAZJxXdx5tfmnSVFNekeU6v8GwmJsKZbVtfxLri51ucVOpNAf+hZTU+n3D7j4I5wpyAoSOvaGuCnxBHADI1rUhd1jj3eocw0qjYoiKKvtWfkE= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Feb 14, 2025 at 7:22=E2=80=AFPM Christoph Lameter (Ampere) wrote: > > On Thu, 13 Feb 2025, Uros Bizjak wrote: > > > OTOH, all recent x86_64 processors support CMPXCHG128 insn, so the > > call alternative will be rarely used. > > Do we still support processors without cmpxchg128? If not then lets just > drop the calls from the kernel. I'm not aware of any discussion about that decision. Thanks, Uros.