linux-kernel - [PATCH v2 0/5] Silence some clang -Wshorten-64-to-32 warnings

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Message-ID: <20250430171534.132774-1-irogers@google.com>
Date: Wed, 30 Apr 2025 10:15:29 -0700
From: Ian Rogers <irogers@...gle.com>
To: Yury Norov <yury.norov@...il.com>, Rasmus Villemoes <linux@...musvillemoes.dk>, 
	Arnd Bergmann <arnd@...db.de>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <nick.desaulniers+lkml@...il.com>, Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>, Ian Rogers <irogers@...gle.com>, 
	Adrian Hunter <adrian.hunter@...el.com>, Thomas Gleixner <tglx@...utronix.de>, 
	Jakub Kicinski <kuba@...nel.org>, Jacob Keller <jacob.e.keller@...el.com>, linux-arch@...r.kernel.org, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev, Leo Yan <leo.yan@....com>
Subject: [PATCH v2 0/5] Silence some clang -Wshorten-64-to-32 warnings

Clang's shorten-64-to-32 can be useful to spot certain kinds of bugs
that can be more prevalent in C code due to implicit 64 to 32-bit
casting. Add some explicit casts to header files so as to avoid the
warning when these headers are used.

This patch started out as a single patch in a series for the perf tool
where a bug could have been identified were -Wshorten-64-to-32
enabled:
https://lore.kernel.org/lkml/20250401182347.3422199-3-irogers@google.com/

v2: Rebase and try to address Arnd Bergmann's comments wrt the commit
    message. Arnd also mentioned doing larger refactors, changing
    return types and adding helper functions. I've held off doing this
    given concerns over breaking printf flags.

Ian Rogers (5):
  bitfield: Silence a clang -Wshorten-64-to-32 warning
  bitmap: Silence a clang -Wshorten-64-to-32 warning
  bitops: Silence a clang -Wshorten-64-to-32 warning
  math64: Silence a clang -Wshorten-64-to-32 warning
  hash.h: Silence a clang -Wshorten-64-to-32 warning

 include/asm-generic/bitops/fls64.h | 2 +-
 include/linux/bitfield.h           | 2 +-
 include/linux/bitmap.h             | 2 +-
 include/linux/hash.h               | 2 +-
 include/linux/math64.h             | 2 +-
 5 files changed, 5 insertions(+), 5 deletions(-)

-- 
2.49.0.906.g1f30a19c02-goog