Hi all, This is version three of the patches I previously posted here: v1: https://lore.kernel.org/lkml/20191108170120.22331-1-will@xxxxxxxxxx/ v2: https://lore.kernel.org/r/20200630173734.14057-1-will@xxxxxxxxxx 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@xxxxxxxxxx> Cc: Sami Tolvanen <samitolvanen@xxxxxxxxxx> Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> Cc: Kees Cook <keescook@xxxxxxxxxxxx> Cc: Marco Elver <elver@xxxxxxxxxx> Cc: "Paul E. McKenney" <paulmck@xxxxxxxxxx> Cc: Matt Turner <mattst88@xxxxxxxxx> Cc: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx> Cc: Richard Henderson <rth@xxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> Cc: "Michael S. Tsirkin" <mst@xxxxxxxxxx> Cc: Jason Wang <jasowang@xxxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Boqun Feng <boqun.feng@xxxxxxxxx> Cc: Catalin Marinas <catalin.marinas@xxxxxxx> Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx> Cc: linux-alpha@xxxxxxxxxxxxxxx Cc: virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx Cc: kernel-team@xxxxxxxxxxx --->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
