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Date: Tue, 14 Mar 2023 13:01:16 -0700
From: Ian Rogers <irogers@...gle.com>
To: Andrii Nakryiko <andrii.nakryiko@...il.com>
Cc: Naresh Kamboju <naresh.kamboju@...aro.org>,
Jiri Olsa <jolsa@...nel.org>,
Arnaldo Carvalho de Melo <acme@...nel.org>,
Namhyung Kim <namhyung@...nel.org>,
Daniel Müller <deso@...teo.net>,
open list <linux-kernel@...r.kernel.org>,
bpf <bpf@...r.kernel.org>, lkft-triage@...ts.linaro.org,
Linux-Next Mailing List <linux-next@...r.kernel.org>,
Andrii Nakryiko <andrii@...nel.org>,
Alexei Starovoitov <ast@...nel.org>,
Daniel Borkmann <daniel@...earbox.net>,
Song Liu <song@...nel.org>, Yonghong Song <yhs@...com>,
KP Singh <kpsingh@...nel.org>,
Anders Roxell <anders.roxell@...aro.org>
Subject: Re: next: zip.c:35:8: error: packed attribute causes inefficient
alignment for 'magic' [-Werror=attributes]
On Tue, Mar 14, 2023 at 11:52 AM Andrii Nakryiko
<andrii.nakryiko@...il.com> wrote:
>
> On Mon, Mar 13, 2023 at 11:38 PM Naresh Kamboju
> <naresh.kamboju@...aro.org> wrote:
> >
> > perf builds failing from Linux next-20230307..next-20230314 but pass on
> > Linux mainline v6.3-rc2.
> >
> > Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>
>
> Thanks for the report, but I'm not sure what's wrong here. We added
> __attribute__((packed)) attribute intentionally and want to keep it
> this way. It seems like perf itself is using packed structs (e.g.,
> struct debug_line_header in util/genelf_debug.c), so I'm wondering why
> that code doesn't cause any problems.
>
> Any hints from perf folks?
We use a #pragma to disable the warnings in at least one place:
https://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git/tree/tools/lib/perf/include/perf/event.h?h=perf-tools#n194
Thanks,
Ian
> >
> > Build log:
> > ---
> > libbpf/staticobjs/zip.o
> > zip.c:35:8: error: packed attribute causes inefficient alignment for
> > 'magic' [-Werror=attributes]
> > 35 | __u32 magic;
> > | ^~~~~
> > zip.c:40:8: error: packed attribute causes inefficient alignment for
> > 'this_disk' [-Werror=attributes]
> > 40 | __u16 this_disk;
> > | ^~~~~~~~~
> > zip.c:45:8: error: packed attribute causes inefficient alignment for
> > 'cd_disk' [-Werror=attributes]
> > 45 | __u16 cd_disk;
> > | ^~~~~~~
> > zip.c:50:8: error: packed attribute causes inefficient alignment for
> > 'cd_records' [-Werror=attributes]
> > 50 | __u16 cd_records;
> > | ^~~~~~~~~~
> > zip.c:55:8: error: packed attribute causes inefficient alignment for
> > 'cd_records_total' [-Werror=attributes]
> > 55 | __u16 cd_records_total;
> > | ^~~~~~~~~~~~~~~~
> > zip.c:58:8: error: packed attribute causes inefficient alignment for
> > 'cd_size' [-Werror=attributes]
> > 58 | __u32 cd_size;
> > | ^~~~~~~
> > zip.c:63:8: error: packed attribute causes inefficient alignment for
> > 'cd_offset' [-Werror=attributes]
> > 63 | __u32 cd_offset;
> > | ^~~~~~~~~
> > zip.c:66:8: error: packed attribute causes inefficient alignment for
> > 'comment_length' [-Werror=attributes]
> > 66 | __u16 comment_length;
> > | ^~~~~~~~~~~~~~
> > zip.c:79:8: error: packed attribute causes inefficient alignment for
> > 'magic' [-Werror=attributes]
> > 79 | __u32 magic;
> > | ^~~~~
> > zip.c:80:8: error: packed attribute causes inefficient alignment for
> > 'version' [-Werror=attributes]
> > 80 | __u16 version;
> > | ^~~~~~~
> > zip.c:82:8: error: packed attribute causes inefficient alignment for
> > 'min_version' [-Werror=attributes]
> > 82 | __u16 min_version;
> > | ^~~~~~~~~~~
> > zip.c:83:8: error: packed attribute causes inefficient alignment for
> > 'flags' [-Werror=attributes]
> > 83 | __u16 flags;
> > | ^~~~~
> > zip.c:84:8: error: packed attribute causes inefficient alignment for
> > 'compression' [-Werror=attributes]
> > 84 | __u16 compression;
> > | ^~~~~~~~~~~
> > zip.c:85:8: error: packed attribute causes inefficient alignment for
> > 'last_modified_time' [-Werror=attributes]
> > 85 | __u16 last_modified_time;
> > | ^~~~~~~~~~~~~~~~~~
> > zip.c:86:8: error: packed attribute causes inefficient alignment for
> > 'last_modified_date' [-Werror=attributes]
> > 86 | __u16 last_modified_date;
> > | ^~~~~~~~~~~~~~~~~~
> > zip.c:87:8: error: packed attribute causes inefficient alignment for
> > 'crc' [-Werror=attributes]
> > 87 | __u32 crc;
> > | ^~~
> > zip.c:88:8: error: packed attribute causes inefficient alignment for
> > 'compressed_size' [-Werror=attributes]
> > 88 | __u32 compressed_size;
> > | ^~~~~~~~~~~~~~~
> > zip.c:89:8: error: packed attribute causes inefficient alignment for
> > 'uncompressed_size' [-Werror=attributes]
> > 89 | __u32 uncompressed_size;
> > | ^~~~~~~~~~~~~~~~~
> > zip.c:90:8: error: packed attribute causes inefficient alignment for
> > 'file_name_length' [-Werror=attributes]
> > 90 | __u16 file_name_length;
> > | ^~~~~~~~~~~~~~~~
> > zip.c:91:8: error: packed attribute causes inefficient alignment for
> > 'extra_field_length' [-Werror=attributes]
> > 91 | __u16 extra_field_length;
> > | ^~~~~~~~~~~~~~~~~~
> > zip.c:92:8: error: packed attribute causes inefficient alignment for
> > 'file_comment_length' [-Werror=attributes]
> > 92 | __u16 file_comment_length;
> > | ^~~~~~~~~~~~~~~~~~~
> > zip.c:94:8: error: packed attribute causes inefficient alignment for
> > 'disk' [-Werror=attributes]
> > 94 | __u16 disk;
> > | ^~~~
> > zip.c:95:8: error: packed attribute causes inefficient alignment for
> > 'internal_attributes' [-Werror=attributes]
> > 95 | __u16 internal_attributes;
> > | ^~~~~~~~~~~~~~~~~~~
> > zip.c:108:8: error: packed attribute causes inefficient alignment for
> > 'magic' [-Werror=attributes]
> > 108 | __u32 magic;
> > | ^~~~~
> > zip.c:110:8: error: packed attribute causes inefficient alignment for
> > 'min_version' [-Werror=attributes]
> > 110 | __u16 min_version;
> > | ^~~~~~~~~~~
> > zip.c:111:8: error: packed attribute causes inefficient alignment for
> > 'flags' [-Werror=attributes]
> > 111 | __u16 flags;
> > | ^~~~~
> > zip.c:112:8: error: packed attribute causes inefficient alignment for
> > 'compression' [-Werror=attributes]
> > 112 | __u16 compression;
> > | ^~~~~~~~~~~
> > zip.c:113:8: error: packed attribute causes inefficient alignment for
> > 'last_modified_time' [-Werror=attributes]
> > 113 | __u16 last_modified_time;
> > | ^~~~~~~~~~~~~~~~~~
> > zip.c:114:8: error: packed attribute causes inefficient alignment for
> > 'last_modified_date' [-Werror=attributes]
> > 114 | __u16 last_modified_date;
> > | ^~~~~~~~~~~~~~~~~~
> > zip.c:118:8: error: packed attribute causes inefficient alignment for
> > 'file_name_length' [-Werror=attributes]
> > 118 | __u16 file_name_length;
> > | ^~~~~~~~~~~~~~~~
> > zip.c:119:8: error: packed attribute causes inefficient alignment for
> > 'extra_field_length' [-Werror=attributes]
> > 119 | __u16 extra_field_length;
> > | ^~~~~~~~~~~~~~~~~~
> > cc1: all warnings being treated as errors
> >
> > Build links,
> > https://storage.tuxsuite.com/public/linaro/lkft/builds/2MfXEyvgh4ba9y3rkt6KPf6sUMR/
> >
> >
> > History link,
> > https://qa-reports.linaro.org/lkft/linux-next-master/build/next-20230314/testrun/15564056/suite/build/test/gcc-10-lkftconfig-perf/history/
> >
> >
> > --
> > Linaro LKFT
> > https://lkft.linaro.org
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