Hi everyone, This is version three of the patches I previously posted for improving the code generation of READ_ONCE() and moving the minimum GCC version to 4.8: RFC: https://lore.kernel.org/lkml/20200110165636.28035-1-will@xxxxxxxxxx v2: https://lore.kernel.org/lkml/20200123153341.19947-1-will@xxxxxxxxxx Although v2 was queued up by Peter in -tip, it was found to break the build for m68k and sparc32. We fixed m68k during the merge window and I've since posted patches to fix sparc32 here: https://lore.kernel.org/lkml/20200414214011.2699-1-will@xxxxxxxxxx This series is a refresh on top of 5.7-rc1, the main changes being: * Fix another issue where 'const' is assigned to non-const via WRITE_ONCE(), this time in the tls code * Fix READ_ONCE_NOCHECK() abuse in arm64 checksum code * Added Reviewed-bys and Acks from v2 Hopefully this can be considered for 5.8, along with the sparc32 changes. Cheers, Will 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 (12): compiler/gcc: Emit build-time warning for GCC prior to version 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 compiler/gcc: Raise minimum GCC version for kernel builds to 4.8 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 | 129 +++---- include/linux/compiler_types.h | 21 ++ init/Kconfig | 5 +- 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/Kconfig.include | 6 + scripts/gcc-plugins/Kconfig | 2 +- 19 files changed, 126 insertions(+), 719 deletions(-) delete mode 100644 kernel/gcov/gcc_3_4.c -- 2.26.0.110.g2183baf09c-goog
