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Message-Id: <20200710165203.31284-1-will@kernel.org>
Date: Fri, 10 Jul 2020 17:51:44 +0100
From: Will Deacon <will@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: Will Deacon <will@...nel.org>, Joel Fernandes <joelaf@...gle.com>,
Sami Tolvanen <samitolvanen@...gle.com>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Kees Cook <keescook@...omium.org>,
Marco Elver <elver@...gle.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Matt Turner <mattst88@...il.com>,
Ivan Kokshaysky <ink@...assic.park.msu.ru>,
Richard Henderson <rth@...ddle.net>,
Peter Zijlstra <peterz@...radead.org>,
Alan Stern <stern@...land.harvard.edu>,
"Michael S. Tsirkin" <mst@...hat.com>,
Jason Wang <jasowang@...hat.com>,
Arnd Bergmann <arnd@...db.de>,
Boqun Feng <boqun.feng@...il.com>,
Catalin Marinas <catalin.marinas@....com>,
Mark Rutland <mark.rutland@....com>,
linux-arm-kernel@...ts.infradead.org, linux-alpha@...r.kernel.org,
virtualization@...ts.linux-foundation.org, kernel-team@...roid.com
Subject: [PATCH 00/18] Allow architectures to override __READ_ONCE()
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 <joelaf@...gle.com>
Cc: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Nick Desaulniers <ndesaulniers@...gle.com>
Cc: Kees Cook <keescook@...omium.org>
Cc: Marco Elver <elver@...gle.com>
Cc: "Paul E. McKenney" <paulmck@...nel.org>
Cc: Matt Turner <mattst88@...il.com>
Cc: Ivan Kokshaysky <ink@...assic.park.msu.ru>
Cc: Richard Henderson <rth@...ddle.net>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Alan Stern <stern@...land.harvard.edu>
Cc: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Jason Wang <jasowang@...hat.com>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: Boqun Feng <boqun.feng@...il.com>
Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Mark Rutland <mark.rutland@....com>
Cc: linux-arm-kernel@...ts.infradead.org>
Cc: linux-alpha@...r.kernel.org
Cc: virtualization@...ts.linux-foundation.org
Cc: kernel-team@...roid.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 <asm/barrier.h> 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
--
2.27.0.383.g050319c2ae-goog
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