From patchwork Fri Jul 10 16:51:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Will Deacon X-Patchwork-Id: 11657141 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 296151709 for ; Fri, 10 Jul 2020 16:54:24 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E85E7206F4 for ; Fri, 10 Jul 2020 16:54:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="Sd2sURYz"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="gpIwsoJ/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E85E7206F4 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:To:From: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References:List-Owner; bh=Yft1n8mmP7ARCk+0ntcNIi5GYCuma5vtAH0BYubhIq8=; b=Sd2sURYzrgTncWbizx6onw4agF kYoNczBzUVNoQOYp96O7R25JDKiwVeEIFaxDfwc1asWcH2FDdasI8X4sMaMv96sfpM63cHLEEIeMn R1fr8axNNB5vDMrfH07YIwv9LE6fbLSco8Puy/xGqGb/DUOOo/Cv/RccmmTQEU4Y6Pvzva4O2lvfD KZmttX65FThTeRet7FR4HB1SQshHxvch5Sw8CF11SUPc12mPMlN3ZlNbET2e92bd6BSDHrK262IXa XGpmsDUDgAlLVViWS6WEnwAXgTlRzDt8JuaMnOYQoyIL3y+eBc6FUD7oS4LJ9GgyrUdOD6dR+RGmI moqajjfw==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jtwG0-0005Hs-GN; Fri, 10 Jul 2020 16:52:16 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1jtwFw-0005GS-8f for linux-arm-kernel@lists.infradead.org; Fri, 10 Jul 2020 16:52:14 +0000 Received: from localhost.localdomain (236.31.169.217.in-addr.arpa [217.169.31.236]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7C5FB206F4; Fri, 10 Jul 2020 16:52:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594399931; bh=KcvQZrHB38KDnUP8nxJc19jdFdt8oGFue3inzmz/Efc=; h=From:To:Cc:Subject:Date:From; b=gpIwsoJ/xXbQSIbhAwidVUNkopiZBRtRJr6jm8fYtOsJO0sGFBU4VrzLmpjt8J0+h bM3ZPwoxoAqbROw+x/9XrPnXHGuUR8yujViPTR/a4kKu7ko3AQlaCr7An51UhICwox /CYhjCD7gHFg3nRhEECbjLxD55E4l8YFtDGAk0TY= From: Will Deacon To: linux-kernel@vger.kernel.org Subject: [PATCH 00/18] Allow architectures to override __READ_ONCE() Date: Fri, 10 Jul 2020 17:51:44 +0100 Message-Id: <20200710165203.31284-1-will@kernel.org> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200710_125213_198919_DFD0F6D3 X-CRM114-Status: GOOD ( 18.04 ) X-Spam-Score: -5.2 (-----) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-5.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- -5.0 RCVD_IN_DNSWL_HI RBL: Sender listed at https://www.dnswl.org/, high trust [198.145.29.99 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.0 DKIMWL_WL_HIGH DKIMwl.org - Whitelisted High sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Joel Fernandes , Mark Rutland , "Michael S. Tsirkin" , Peter Zijlstra , Catalin Marinas , Jason Wang , virtualization@lists.linux-foundation.org, Will Deacon , Arnd Bergmann , Alan Stern , Sami Tolvanen , Matt Turner , kernel-team@android.com, Marco Elver , Kees Cook , "Paul E. McKenney" , Boqun Feng , Ivan Kokshaysky , linux-arm-kernel@lists.infradead.org, Richard Henderson , Nick Desaulniers , linux-alpha@vger.kernel.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org Hi all, This is version three of the patches I previously posted here: v1: https://lore.kernel.org/lkml/20191108170120.22331-1-will@kernel.org/ v2: https://lore.kernel.org/r/20200630173734.14057-1-will@kernel.org Changes since v2 include: * Actually add the barrier in READ_ONCE() for Alpha! * Implement Alpha's smp_load_acquire() using __READ_ONCE(), rather than the other way around. * Further untangling of header files * Use CONFIG_LTO instead of CONFIG_CLANG_LTO I have booted this on arm64, and build-tested as follows: - arm64 allnoconfig, defconfig (also bisected) and allmodconfig - arm32 allnoconfig, defconfig and allmodconfig - x86_64 allnoconfig, defconfig and allmodcofig - alpha defconfig, defconfig+CONFIG_SMP=y - riscv64 defconfig - powerpc64 defconfig - s390 defconfig - sparc32 defconfig, defconfig+CONFIG_SMP=y - sparc64 defconfig Cheers, Will Cc: Joel Fernandes Cc: Sami Tolvanen Cc: Nick Desaulniers Cc: Kees Cook Cc: Marco Elver Cc: "Paul E. McKenney" Cc: Matt Turner Cc: Ivan Kokshaysky Cc: Richard Henderson Cc: Peter Zijlstra Cc: Alan Stern Cc: "Michael S. Tsirkin" Cc: Jason Wang Cc: Arnd Bergmann Cc: Boqun Feng Cc: Catalin Marinas Cc: Mark Rutland Cc: linux-arm-kernel@lists.infradead.org> Cc: linux-alpha@vger.kernel.org Cc: virtualization@lists.linux-foundation.org Cc: kernel-team@android.com --->8 SeongJae Park (1): Documentation/barriers/kokr: Remove references to [smp_]read_barrier_depends() Will Deacon (18): tools: bpf: Use local copy of headers including uapi/linux/filter.h compiler.h: Split {READ,WRITE}_ONCE definitions out into rwonce.h asm/rwonce: Allow __READ_ONCE to be overridden by the architecture alpha: Override READ_ONCE() with barriered implementation asm/rwonce: Remove smp_read_barrier_depends() invocation asm/rwonce: Don't pull into 'asm-generic/rwonce.h' vhost: Remove redundant use of read_barrier_depends() barrier alpha: Replace smp_read_barrier_depends() usage with smp_[r]mb() locking/barriers: Remove definitions for [smp_]read_barrier_depends() Documentation/barriers: Remove references to [smp_]read_barrier_depends() tools/memory-model: Remove smp_read_barrier_depends() from informal doc include/linux: Remove smp_read_barrier_depends() from comments checkpatch: Remove checks relating to [smp_]read_barrier_depends() arm64: Reduce the number of header files pulled into vmlinux.lds.S arm64: alternatives: Split up alternative.h arm64: cpufeatures: Add capability for LDAPR instruction arm64: alternatives: Remove READ_ONCE() usage during patch operation arm64: lto: Strengthen READ_ONCE() to acquire when CONFIG_LTO=y .../RCU/Design/Requirements/Requirements.rst | 2 +- Documentation/memory-barriers.txt | 156 +--------- .../translations/ko_KR/memory-barriers.txt | 146 +-------- arch/alpha/include/asm/atomic.h | 16 +- arch/alpha/include/asm/barrier.h | 59 +--- arch/alpha/include/asm/pgtable.h | 10 +- arch/alpha/include/asm/rwonce.h | 35 +++ arch/arm/include/asm/vdso/gettimeofday.h | 1 + arch/arm64/Kconfig | 3 + arch/arm64/include/asm/alternative-macros.h | 276 ++++++++++++++++++ arch/arm64/include/asm/alternative.h | 267 +---------------- arch/arm64/include/asm/cpucaps.h | 3 +- arch/arm64/include/asm/insn.h | 3 +- arch/arm64/include/asm/kernel-pgtable.h | 2 +- arch/arm64/include/asm/memory.h | 11 +- arch/arm64/include/asm/rwonce.h | 63 ++++ arch/arm64/include/asm/uaccess.h | 1 + .../include/asm/vdso/compat_gettimeofday.h | 1 + arch/arm64/include/asm/vdso/gettimeofday.h | 1 + arch/arm64/kernel/alternative.c | 7 +- arch/arm64/kernel/cpufeature.c | 10 + arch/arm64/kernel/entry.S | 1 + arch/arm64/kernel/vdso/Makefile | 2 +- arch/arm64/kernel/vdso32/Makefile | 2 +- arch/arm64/kernel/vmlinux.lds.S | 1 - arch/arm64/kvm/hyp-init.S | 1 + arch/riscv/include/asm/vdso/gettimeofday.h | 1 + drivers/vhost/vhost.c | 5 - include/asm-generic/Kbuild | 1 + include/asm-generic/barrier.h | 19 +- include/asm-generic/rwonce.h | 80 +++++ include/linux/compiler.h | 83 +----- include/linux/nospec.h | 2 + include/linux/percpu-refcount.h | 2 +- include/linux/ptr_ring.h | 2 +- mm/memory.c | 2 +- scripts/checkpatch.pl | 9 +- tools/bpf/Makefile | 3 +- tools/include/uapi/linux/filter.h | 90 ++++++ .../Documentation/explanation.txt | 26 +- 40 files changed, 636 insertions(+), 769 deletions(-) create mode 100644 arch/alpha/include/asm/rwonce.h create mode 100644 arch/arm64/include/asm/alternative-macros.h create mode 100644 arch/arm64/include/asm/rwonce.h create mode 100644 include/asm-generic/rwonce.h create mode 100644 tools/include/uapi/linux/filter.h Acked-by: Peter Zijlstra (Intel)