Hi, It's me again. This is version four of the READ_ONCE() codegen improvement patches that I previously posted here: RFC: https://lore.kernel.org/lkml/20200110165636.28035-1-will@xxxxxxxxxx v2: https://lore.kernel.org/lkml/20200123153341.19947-1-will@xxxxxxxxxx v3: https://lore.kernel.org/lkml/20200415165218.20251-1-will@xxxxxxxxxx/ Changes since v3 include: * Drop the patch warning for GCC versions prior to 4.8 * Move the patch raising the minimum GCC version earlier in the series * Reintroduce the old READ_ONCE_NOCHECK behaviour so that it can continue to be used by stack unwinders As before, this will break the build for sparc32 without the changes here: https://lore.kernel.org/lkml/20200414214011.2699-1-will@xxxxxxxxxx and boy are they proving to be popular (I'm interpreting the silence as monumental joy). Ta, Will Cc: Mark Rutland <mark.rutland@xxxxxxx> Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Segher Boessenkool <segher@xxxxxxxxxxxxxxxxxxx> Cc: Christian Borntraeger <borntraeger@xxxxxxxxxx> Cc: Luc Van Oostenryck <luc.vanoostenryck@xxxxxxxxx> Cc: Arnd Bergmann <arnd@xxxxxxxx> Cc: Peter Oberparleiter <oberpar@xxxxxxxxxxxxx> Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx> Cc: Nick Desaulniers <ndesaulniers@xxxxxxxxxx> --->8 Will Deacon (11): compiler/gcc: Raise minimum GCC version for kernel builds to 4.8 netfilter: Avoid assigning 'const' pointer to non-const pointer net: tls: Avoid assigning 'const' pointer to non-const pointer fault_inject: Don't rely on "return value" from WRITE_ONCE() arm64: csum: Disable KASAN for do_csum() READ_ONCE: Simplify implementations of {READ,WRITE}_ONCE() READ_ONCE: Enforce atomicity for {READ,WRITE}_ONCE() memory accesses READ_ONCE: Drop pointer qualifiers when reading from scalar types locking/barriers: Use '__unqual_scalar_typeof' for load-acquire macros arm64: barrier: Use '__unqual_scalar_typeof' for acquire/release macros gcov: Remove old GCC 3.4 support Documentation/process/changes.rst | 2 +- arch/arm/crypto/Kconfig | 12 +- arch/arm64/include/asm/barrier.h | 16 +- arch/arm64/lib/csum.c | 20 +- crypto/Kconfig | 1 - drivers/xen/time.c | 2 +- include/asm-generic/barrier.h | 16 +- include/linux/compiler-gcc.h | 5 +- include/linux/compiler.h | 145 ++++---- include/linux/compiler_types.h | 21 ++ init/Kconfig | 1 - kernel/gcov/Kconfig | 24 -- kernel/gcov/Makefile | 3 +- kernel/gcov/gcc_3_4.c | 573 ------------------------------ lib/fault-inject.c | 4 +- net/netfilter/core.c | 2 +- net/tls/tls_main.c | 2 +- scripts/gcc-plugins/Kconfig | 2 +- 18 files changed, 132 insertions(+), 719 deletions(-) delete mode 100644 kernel/gcov/gcc_3_4.c -- 2.26.1.301.g55bc3eb7cb9-goog
