linux-kernel - Re: [PATCH 1/1 fyi] tools headers: Synchronize linux/bits.h with the kernel sources

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Message-ID: <b5030bc8-34b8-4275-86ba-11e11ab2bea5@wanadoo.fr>
Date: Fri, 13 Jun 2025 21:24:35 +0900
From: Vincent Mailhol <mailhol.vincent@...adoo.fr>
To: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Adrian Hunter <adrian.hunter@...el.com>, Ian Rogers <irogers@...gle.com>,
 James Clark <james.clark@...aro.org>, Jiri Olsa <jolsa@...nel.org>,
 Kan Liang <kan.liang@...ux.intel.com>,
 Lucas De Marchi <lucas.demarchi@...el.com>,
 Namhyung Kim <namhyung@...nel.org>, Yury Norov <yury.norov@...il.com>,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1 fyi] tools headers: Synchronize linux/bits.h with the
 kernel sources

On 13/06/2025 at 00:38, Arnaldo Carvalho de Melo wrote:
> tldr; Just FYI, I'm carrying this on the perf tools tree.
> 
> Full explanation:
> 
> There used to be no copies, with tools/ code using kernel headers
> directly. From time to time tools/perf/ broke due to legitimate kernel
> hacking. At some point Linus complained about such direct usage. Then we
> adopted the current model.
> 
> See further details at:
> 
>  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/include/uapi/README
> 
> To pick up the changes in this cset:
> 
>   5b572e8a9f3dcd6e ("bits: introduce fixed-type BIT_U*()")
>   19408200c094858d ("bits: introduce fixed-type GENMASK_U*()")
>   31299a5e02112411 ("bits: add comments and newlines to #if, #else and #endif directives")
> 
> This addresses these perf build warnings:
> 
>   Warning: Kernel ABI header differences:
>     diff -u tools/include/linux/bits.h include/linux/bits.h
> 
> Please see tools/include/uapi/README for further details.
> 
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Ian Rogers <irogers@...gle.com>
> Cc: James Clark <james.clark@...aro.org>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Kan Liang <kan.liang@...ux.intel.com>
> Cc: Lucas De Marchi <lucas.demarchi@...el.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Vincent Mailhol <mailhol.vincent@...adoo.fr>
> Cc: Yury Norov <yury.norov@...il.com>
> Link: https://lore.kernel.org/r/
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

For what it is worth:

Acked-by: Vincent Mailhol <mailhol.vincent@...adoo.fr>


Yours sincerely,
Vincent Mailhol