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modpost: propagate W=1 build option to modpost

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commit 20ff36856f upstream.

"No build warning" is a strong requirement these days, so you must fix
all issues before enabling a new warning flag.

We often add a new warning to W=1 first so that the kbuild test robot
blocks new breakages.

This commit allows modpost to show extra warnings only when W=1
(or KBUILD_EXTRA_WARN=1) is given.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Stable-dep-of: 846cfbeed0 ("um: Fix adding '-no-pie' for clang")
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Masahiro Yamada 2023-06-06 18:41:59 +09:00 committed by Greg Kroah-Hartman
parent 6286435cd0
commit a5767decf7
2 changed files with 7 additions and 1 deletions
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1
scripts/Makefile.modpost
View File

@ -44,6 +44,7 @@ modpost-args = \
$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E) \
$(if $(KBUILD_NSDEPS),-d $(MODULES_NSDEPS)) \
$(if $(CONFIG_MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS)$(KBUILD_NSDEPS),-N) \
$(if $(findstring 1, $(KBUILD_EXTRA_WARN)),-W) \
-o $@
# 'make -i -k' ignores compile errors, and builds as many modules as possible.

7
scripts/mod/modpost.c
View File

@ -41,6 +41,8 @@ static bool allow_missing_ns_imports;
static bool error_occurred;
static bool extra_warn;
/*
* Cut off the warnings when there are too many. This typically occurs when
* vmlinux is missing. ('make modules' without building vmlinux.)
@ -2290,7 +2292,7 @@ int main(int argc, char **argv)
LIST_HEAD(dump_lists);
struct dump_list *dl, *dl2;
while ((opt = getopt(argc, argv, "ei:mnT:o:awENd:")) != -1) {
while ((opt = getopt(argc, argv, "ei:mnT:o:aWwENd:")) != -1) {
switch (opt) {
case 'e':
external_module = true;
@ -2315,6 +2317,9 @@ int main(int argc, char **argv)
case 'T':
files_source = optarg;
break;
case 'W':
extra_warn = true;
break;
case 'w':
warn_unresolved = true;
break;