linux-kernel - Re: [PATCH v2 4/6] perf cpumap: Fix alignment for masks in event encoding

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Date:   Fri, 26 Aug 2022 14:57:18 +0200
From:   Alexander Gordeev <agordeev@...ux.ibm.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        James Clark <james.clark@....com>,
        Kees Cook <keescook@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        German Gomez <german.gomez@....com>,
        Colin Ian King <colin.king@...el.com>,
        Song Liu <songliubraving@...com>,
        Dave Marchevsky <davemarchevsky@...com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Leo Yan <leo.yan@...aro.org>, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org, Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v2 4/6] perf cpumap: Fix alignment for masks in event
 encoding

On Tue, Jun 14, 2022 at 07:33:51AM -0700, Ian Rogers wrote:

Hi Ian,

Although it is committed, still have a question.

> index e7758707cadd..d2d32589758a 100644
> --- a/tools/lib/perf/include/perf/event.h
> +++ b/tools/lib/perf/include/perf/event.h
> @@ -6,6 +6,7 @@
>  #include <linux/types.h>
>  #include <linux/limits.h>
>  #include <linux/bpf.h>
> +#include <linux/compiler.h>

Is it correct approach to include it into user-exposed headers?
AFAICT headers_install.sh strips #include <linux/compiler.h> and
compiler*.h itself do not get installed with make headers_install.

[...]

> +struct __packed perf_record_cpu_map_data {

And it is only needed to pull __packed macro, right?

Thanks!