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Date:   Mon, 5 Dec 2022 09:50:44 -0300
From:   Arnaldo Carvalho de Melo <acme@kernel.org>
To:     Ian Rogers <irogers@google.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Josh Poimboeuf <jpoimboe@kernel.org>,
        Nathan Chancellor <nathan@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        Tom Rix <trix@redhat.com>,
        Masahiro Yamada <masahiroy@kernel.org>,
        Nicolas Schier <nicolas@fjasle.eu>,
        linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org,
        bpf@vger.kernel.org, llvm@lists.linux.dev,
        Stephane Eranian <eranian@google.com>
Subject: Re: [PATCH 0/5] Improvements to incremental builds
Message-ID: <Y43pJOmF1y3JWrX8@kernel.org>
References: <20221202045743.2639466-1-irogers@google.com>
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Em Thu, Dec 01, 2022 at 08:57:38PM -0800, Ian Rogers escreveu:
> Switching to using install_headers caused incremental builds to always
> rebuild most targets. This was caused by the headers always being
> reinstalled and then getting new timestamps causing dependencies to be
> rebuilt. Follow the convention in libbpf where the install targets are
> separated and trigger when the target isn't present or is out-of-date.
> 
> Further, fix an issue in the perf build with libpython where
> python/perf.so was also regenerated as the target name was incorrect.
> 
> Ian Rogers (5):
>   tools lib api: Add dependency test to install_headers
>   tools lib perf: Add dependency test to install_headers
>   tools lib subcmd: Add dependency test to install_headers
>   tools lib symbol: Add dependency test to install_headers
>   perf build: Fix python/perf.so library's name

The last one isn't applying:

Applying: perf build: Fix python/perf.so library's name
error: patch failed: tools/perf/Makefile.perf:642
error: tools/perf/Makefile.perf: patch does not apply
Patch failed at 0005 perf build: Fix python/perf.so library's name
hint: Use 'git am --show-current-patch=diff' to see the failed patch
When you have resolved this problem, run "git am --continue".
If you prefer to skip this patch, run "git am --skip" instead.
To restore the original branch and stop patching, run "git am --abort".
⬢[acme@toolbox perf]$

I'll have the first 4 applied to make progress, later I'll check what
went wrong and to fix it.

- Arnaldo