[PATCH v2 0/3] Resolve -Wattribute-alias warnings from SYSCALL_DEFINEx()

[Paul Burton]

This series introduces infrastructure allowing compiler diagnostics to
be disabled or their severity modified for specific pieces of code, with
suitable abstractions to prevent that code from becoming tied to a
specific compiler.

This infrastructure is then used to disable the -Wattribute-alias
warning around syscall definitions, which rely on type mismatches to
sanitize arguments.

Finally PowerPC-specific #pragma's are removed now that the generic code
is handling this.

The series takes Arnd's RFC patches & addresses the review comments they
received. The most notable effect of this series to to avoid warnings &
build failures caused by -Wattribute-alias when compiling the kernel
with GCC 8.

Applies cleanly atop v4.18-rc1.

Thanks,
    Paul

Arnd Bergmann (2):
  kbuild: add macro for controlling warnings to linux/compiler.h
  disable -Wattribute-alias warning for SYSCALL_DEFINEx()

Paul Burton (1):
  powerpc: Remove -Wattribute-alias pragmas

 arch/powerpc/kernel/pci_32.c    |  4 ----
 arch/powerpc/kernel/pci_64.c    |  4 ----
 arch/powerpc/kernel/rtas.c      |  4 ----
 arch/powerpc/kernel/signal_32.c |  8 --------
 arch/powerpc/kernel/signal_64.c |  4 ----
 arch/powerpc/kernel/syscalls.c  |  4 ----
 arch/powerpc/mm/subpage-prot.c  |  4 ----
 include/linux/compat.h          |  8 +++++++-
 include/linux/compiler-gcc.h    | 27 +++++++++++++++++++++++++++
 include/linux/compiler_types.h  | 18 ++++++++++++++++++
 include/linux/syscalls.h        |  4 ++++
 11 files changed, 56 insertions(+), 33 deletions(-)

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2.17.1