linux-kernel - Re: [PATCH 0/5] Improvements to incremental builds

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Message-ID: <Y43pJOmF1y3JWrX8@kernel.org>
Date:   Mon, 5 Dec 2022 09:50:44 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Josh Poimboeuf <jpoimboe@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Nicolas Schier <nicolas@...sle.eu>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org, llvm@...ts.linux.dev,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 0/5] Improvements to incremental builds

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 separated and trigger when the target isn't present or is out-of-date.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@...lbox perf]$

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

- Arnaldo