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[209.85.219.176]) by smtp.gmail.com with ESMTPSA id n199-20020a2540d0000000b00d09f472c58esm1620307yba.18.2023.07.25.00.23.41 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Jul 2023 00:23:41 -0700 (PDT) Received: by mail-yb1-f176.google.com with SMTP id 3f1490d57ef6-d0b597e7ac1so2844991276.1 for ; Tue, 25 Jul 2023 00:23:41 -0700 (PDT) X-Received: by 2002:a25:4ed5:0:b0:c37:f0b4:4062 with SMTP id c204-20020a254ed5000000b00c37f0b44062mr8317164ybb.0.1690269821600; Tue, 25 Jul 2023 00:23:41 -0700 (PDT) MIME-Version: 1.0 References: <20230721102237.268073801@infradead.org> <20230721105744.298661259@infradead.org> In-Reply-To: <20230721105744.298661259@infradead.org> From: Geert Uytterhoeven Date: Tue, 25 Jul 2023 09:23:29 +0200 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v1 09/14] futex: Add sys_futex_requeue() To: Peter Zijlstra Cc: tglx@linutronix.de, axboe@kernel.dk, linux-kernel@vger.kernel.org, mingo@redhat.com, dvhart@infradead.org, dave@stgolabs.net, andrealmeid@igalia.com, Andrew Morton , urezki@gmail.com, hch@infradead.org, lstoakes@gmail.com, Arnd Bergmann , linux-api@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, malteskarupke@web.de Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: 5E97B140008 X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: p14zk9dyaca9k8j4o8nhr9atwknqz65k X-HE-Tag: 1690269823-574403 X-HE-Meta: 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 gFVmoOzy 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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, Jul 21, 2023 at 1:11=E2=80=AFPM Peter Zijlstra wrote: > Finish of the 'simple' futex2 syscall group by adding > sys_futex_requeue(). Unlike sys_futex_{wait,wake}() it's arguments are > too numerous to fit into a regular syscall. As such, use struct > futex_waitv to pass the 'source' and 'destination' futexes to the > syscall. > > This syscall implements what was previously known as FUTEX_CMP_REQUEUE > and uses {val, uaddr, flags} for source and {uaddr, flags} for > destination. > > This design explicitly allows requeueing between different types of > futex by having a different flags word per uaddr. > > Signed-off-by: Peter Zijlstra (Intel) > arch/m68k/kernel/syscalls/syscall.tbl | 1 Acked-by: Geert Uytterhoeven Gr{oetje,eeting}s, Geert --=20 Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k= .org In personal conversations with technical people, I call myself a hacker. Bu= t when I'm talking to journalists I just say "programmer" or something like t= hat. -- Linus Torvalds