[PATCH v2 0/3] PPC: Fix -Wimplicit-fallthrough for clang

[Nick Desaulniers <ndesaulniers@google.com>]

While cleaning up the last few -Wimplicit-fallthrough warnings in tree
for Clang, I noticed
commit 6a9dc5fd6170d ("lib: Revert use of fallthrough pseudo-keyword in lib/")
which seemed to undo a bunch of fixes in lib/ due to breakage in
arch/powerpc/boot/ not including compiler_types.h.  We don't need
compiler_types.h for the definition of `fallthrough`, simply
compiler_attributes.h.  Include that, revert the revert to lib/, and fix
the last remaining cases I observed for powernv_defconfig.

Changes V1->V2:
* collect tags via b4 (fix Gustavo's tag as per Miguel in patch 2/3).
* reword commit message of patch 1/3 as per Arvind.
* reformat patch 2/3 as per kernel test robot and Gustavo.

Nick Desaulniers (3):
  powerpc: boot: include compiler_attributes.h
  Revert "lib: Revert use of fallthrough pseudo-keyword in lib/"
  powerpc: fix -Wimplicit-fallthrough

 arch/powerpc/boot/Makefile      |  1 +
 arch/powerpc/boot/decompress.c  |  1 -
 arch/powerpc/kernel/prom_init.c |  1 +
 arch/powerpc/kernel/uprobes.c   |  1 +
 arch/powerpc/perf/imc-pmu.c     |  1 +
 lib/asn1_decoder.c              |  4 ++--
 lib/assoc_array.c               |  2 +-
 lib/bootconfig.c                |  4 ++--
 lib/cmdline.c                   | 10 ++++-----
 lib/dim/net_dim.c               |  2 +-
 lib/dim/rdma_dim.c              |  4 ++--
 lib/glob.c                      |  2 +-
 lib/siphash.c                   | 36 ++++++++++++++++-----------------
 lib/ts_fsm.c                    |  2 +-
 lib/vsprintf.c                  | 14 ++++++-------
 lib/xz/xz_dec_lzma2.c           |  4 ++--
 lib/xz/xz_dec_stream.c          | 16 +++++++--------
 lib/zstd/bitstream.h            | 10 ++++-----
 lib/zstd/compress.c             |  2 +-
 lib/zstd/decompress.c           | 12 +++++------
 lib/zstd/huf_compress.c         | 17 +++++++++++-----
 21 files changed, 78 insertions(+), 68 deletions(-)

-- 
2.29.2.299.gdc1121823c-goog