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Date: Sat, 19 Sep 2020 15:21:34 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
Filipe Brandenburger <filbranden@...gle.com>,
Greg Thelen <gthelen@...gle.com>,
Michael Davidson <md@...gle.com>,
Eugene Surovegin <surovegin@...gle.com>,
Stephen Rothwell <sfr@...b.auug.org.au>,
Michal Marek <michal.lkml@...kovi.net>,
Jonathan Corbet <corbet@....net>,
"open list:DOCUMENTATION" <linux-doc@...r.kernel.org>
Subject: Re: [PATCH] modpost: allow modpost to fail on warnings
On Sat, Sep 19, 2020 at 6:50 AM Pierre-Louis Bossart
<pierre-louis.bossart@...ux.intel.com> wrote:
>
> From: Filipe Brandenburger <filbranden@...gle.com>
>
> Set KBUILD_MODPOST_FAIL_ON_WARNINGS to a non-empty value to make the
> kbuild fail when modpost generates any warnings. This will avoid
> misses such as [1] where the SOF CI did not catch a missing module
> license.
>
> This was initially contributed in 2016 [2], rebase/clean-ups and tests
> by Pierre Bossart.
>
> Test example:
> $ KBUILD_MODPOST_FAIL_ON_WARNINGS=1 make
> GEN Makefile
> DESCEND objtool
> CALL sof-dev/scripts/atomic/check-atomics.sh
> CALL sof-dev/scripts/checksyscalls.sh
> CHK include/generated/compile.h
> MODPOST Module.symvers
> Kernel: arch/x86/boot/bzImage is ready (#13)
> WARNING: modpost: missing MODULE_LICENSE() in sound/soc/intel/boards/snd-soc-sof-sdw.o
> make[2]: *** [sof-dev/scripts/Makefile.modpost:114: Module.symvers] Error 2
I think [1] should be an error instead of a warning
by default.
> [1] https://lkml.org/lkml/2020/9/17/2343
> [2] https://patchwork.kernel.org/patch/8343431/
>
> Signed-off-by: Filipe Brandenburger <filbranden@...gle.com>
> Cc: Greg Thelen <gthelen@...gle.com>
> Cc: Michael Davidson <md@...gle.com>
> Cc: Eugene Surovegin <surovegin@...gle.com>
> Cc: Stephen Rothwell <sfr@...b.auug.org.au>
> Co-developed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
> ---
> Documentation/kbuild/kbuild.rst | 5 +++++
> scripts/Makefile.modpost | 5 ++++-
> scripts/mod/modpost.c | 12 +++++++++++-
> 3 files changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/kbuild/kbuild.rst b/Documentation/kbuild/kbuild.rst
> index 2d1fc03d346e..cc102aad8619 100644
> --- a/Documentation/kbuild/kbuild.rst
> +++ b/Documentation/kbuild/kbuild.rst
> @@ -229,6 +229,11 @@ KBUILD_MODPOST_WARN can be set to avoid errors in case of undefined
> symbols in the final module linking stage. It changes such errors
> into warnings.
>
> +KBUILD_MODPOST_FAIL_ON_WARNINGS
> +-------------------------------
> +KBUILD_MODPOST_FAIL_ON_WARNINGS can be set to turn all warnings into
> +errors in the final module linking stage.
> +
> KBUILD_MODPOST_NOFINAL
> ----------------------
> KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
> diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
> index f54b6ac37ac2..69297cd6f8ce 100644
> --- a/scripts/Makefile.modpost
> +++ b/scripts/Makefile.modpost
> @@ -34,6 +34,8 @@
>
> # KBUILD_MODPOST_WARN can be set to avoid error out in case of undefined
> # symbols in the final module linking stage
> +# KBUILD_MODPOST_FAIL_ON_WARNINGS can be set to fail whenever modpost
> +# generates warnings
> # KBUILD_MODPOST_NOFINAL can be set to skip the final link of modules.
> # This is solely useful to speed up test compiles
>
> @@ -47,7 +49,8 @@ MODPOST = scripts/mod/modpost \
> $(if $(CONFIG_MODVERSIONS),-m) \
> $(if $(CONFIG_MODULE_SRCVERSION_ALL),-a) \
> $(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
> - $(if $(KBUILD_MODPOST_WARN),-w) \
> + $(if $(KBUILD_MODPOST_WARN),-w) \
> + $(if $(KBUILD_MODPOST_FAIL_ON_WARNINGS),-F) \
> -o $@
>
> ifdef MODPOST_VMLINUX
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 69341b36f271..422f1cfca289 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -39,6 +39,9 @@ static int sec_mismatch_fatal = 0;
> static int ignore_missing_files;
> /* If set to 1, only warn (instead of error) about missing ns imports */
> static int allow_missing_ns_imports;
> +/* Turn warnings into errors */
> +static int fail_on_warnings;
> +static int warnings_count;
>
> enum export {
> export_plain, export_unused, export_gpl,
> @@ -59,6 +62,7 @@ modpost_log(enum loglevel loglevel, const char *fmt, ...)
> switch (loglevel) {
> case LOG_WARN:
> fprintf(stderr, "WARNING: ");
> + warnings_count++;
> break;
> case LOG_ERROR:
> fprintf(stderr, "ERROR: ");
> @@ -2559,7 +2563,7 @@ int main(int argc, char **argv)
> struct dump_list *dump_read_start = NULL;
> struct dump_list **dump_read_iter = &dump_read_start;
>
> - while ((opt = getopt(argc, argv, "ei:mnT:o:awENd:")) != -1) {
> + while ((opt = getopt(argc, argv, "ei:mnT:o:awEFNd:")) != -1) {
> switch (opt) {
> case 'e':
> external_module = 1;
> @@ -2588,6 +2592,9 @@ int main(int argc, char **argv)
> case 'w':
> warn_unresolved = 1;
> break;
> + case 'F':
> + fail_on_warnings = 1;
> + break;
> case 'E':
> sec_mismatch_fatal = 1;
> break;
> @@ -2671,5 +2678,8 @@ int main(int argc, char **argv)
>
> free(buf.p);
>
> + if (fail_on_warnings && warnings_count)
> + err |= 2;
> +
> return err;
> }
> --
> 2.25.1
>
--
Best Regards
Masahiro Yamada
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