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Date: Wed, 14 Dec 2022 15:39:29 +0900
From: Masahiro Yamada <masahiroy@...nel.org>
To: linux-kbuild@...r.kernel.org
Cc: linux-kernel@...r.kernel.org, Luis Chamberlain <mcgrof@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Nicolas Schier <nicolas@...sle.eu>, Tom Rix <trix@...hat.com>,
linux-modules@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH 1/2] kbuild: change module.order to list *.o instead of *.ko
On Sun, Dec 11, 2022 at 10:04 PM Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> scripts/Makefile.build replaces the suffix .o with .ko, then
> scripts/Makefile.modpost calls the sed command to change .ko back
> to the original .o suffix.
>
> Instead of converting the suffixes back-and-forth, store the .o paths
> in modules.order, and replace it with .ko in 'make modules_install'.
>
> This avoids the unneeded sed command.
>
> Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
0day bot reported a breakage when CONFIG_TRIM_UNUSED_KSYMS=y
I will squash the following diff.
diff --git a/scripts/gen_autoksyms.sh b/scripts/gen_autoksyms.sh
index 653fadbad302..12bcfae940ee 100755
--- a/scripts/gen_autoksyms.sh
+++ b/scripts/gen_autoksyms.sh
@@ -48,7 +48,7 @@ cat > "$output_file" << EOT
EOT
{
- [ -n "${read_modorder}" ] && sed 's/ko$/usyms/' modules.order
| xargs cat
+ [ -n "${read_modorder}" ] && sed 's/o$/usyms/' modules.order | xargs cat
echo "$needed_symbols"
[ -n "$ksym_wl" ] && cat "$ksym_wl"
} | sed -e 's/ /\n/g' | sed -n -e '/^$/!p' |
> ---
>
> Makefile | 2 +-
> scripts/Makefile.build | 2 +-
> scripts/Makefile.modfinal | 6 +++---
> scripts/Makefile.modinst | 2 +-
> scripts/Makefile.modpost | 7 +++++--
> scripts/clang-tools/gen_compile_commands.py | 8 ++++----
> scripts/mod/modpost.c | 11 ++++-------
> scripts/modules-check.sh | 2 +-
> 8 files changed, 20 insertions(+), 20 deletions(-)
>
> diff --git a/Makefile b/Makefile
> index 8b5930d521fc..669e25970917 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -1569,7 +1569,7 @@ __modinst_pre:
> rm -f $(MODLIB)/build ; \
> ln -s $(CURDIR) $(MODLIB)/build ; \
> fi
> - @sed 's:^:kernel/:' modules.order > $(MODLIB)/modules.order
> + @sed 's:^\(.*\)\.o$$:kernel/\1.ko:' modules.order > $(MODLIB)/modules.order
> @cp -f modules.builtin $(MODLIB)/
> @cp -f $(objtree)/modules.builtin.modinfo $(MODLIB)/
>
> diff --git a/scripts/Makefile.build b/scripts/Makefile.build
> index 799df12b53f3..267eb7aac5b2 100644
> --- a/scripts/Makefile.build
> +++ b/scripts/Makefile.build
> @@ -435,7 +435,7 @@ $(obj)/built-in.a: $(real-obj-y) FORCE
> # modules.order unless contained modules are updated.
>
> cmd_modules_order = { $(foreach m, $(real-prereqs), \
> - $(if $(filter %/modules.order, $m), cat $m, echo $(patsubst %.o,%.ko,$m));) :; } \
> + $(if $(filter %/modules.order, $m), cat $m, echo $m);) :; } \
> > $@
>
> $(obj)/modules.order: $(obj-m) FORCE
> diff --git a/scripts/Makefile.modfinal b/scripts/Makefile.modfinal
> index 83f2797e530c..a30d5b08eee9 100644
> --- a/scripts/Makefile.modfinal
> +++ b/scripts/Makefile.modfinal
> @@ -15,7 +15,7 @@ include $(srctree)/scripts/Makefile.lib
> # find all modules listed in modules.order
> modules := $(call read-file, $(MODORDER))
>
> -__modfinal: $(modules)
> +__modfinal: $(modules:%.o=%.ko)
> @:
>
> # modname and part-of-module are set to make c_flags define proper module flags
> @@ -57,13 +57,13 @@ if_changed_except = $(if $(call newer_prereqs_except,$(2))$(cmd-check), \
> printf '%s\n' 'cmd_$@ := $(make-cmd)' > $(dot-target).cmd, @:)
>
> # Re-generate module BTFs if either module's .ko or vmlinux changed
> -$(modules): %.ko: %.o %.mod.o scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),vmlinux) FORCE
> +%.ko: %.o %.mod.o scripts/module.lds $(and $(CONFIG_DEBUG_INFO_BTF_MODULES),$(KBUILD_BUILTIN),vmlinux) FORCE
> +$(call if_changed_except,ld_ko_o,vmlinux)
> ifdef CONFIG_DEBUG_INFO_BTF_MODULES
> +$(if $(newer-prereqs),$(call cmd,btf_ko))
> endif
>
> -targets += $(modules) $(modules:.ko=.mod.o)
> +targets += $(modules:%.o=%.ko) $(modules:%.o=%.mod.o)
>
> # Add FORCE to the prequisites of a target to force it to be always rebuilt.
> # ---------------------------------------------------------------------------
> diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
> index 65aac6be78ec..836391e5d209 100644
> --- a/scripts/Makefile.modinst
> +++ b/scripts/Makefile.modinst
> @@ -26,7 +26,7 @@ suffix-$(CONFIG_MODULE_COMPRESS_GZIP) := .gz
> suffix-$(CONFIG_MODULE_COMPRESS_XZ) := .xz
> suffix-$(CONFIG_MODULE_COMPRESS_ZSTD) := .zst
>
> -modules := $(patsubst $(extmod_prefix)%, $(dst)/%$(suffix-y), $(modules))
> +modules := $(patsubst $(extmod_prefix)%.o, $(dst)/%.ko$(suffix-y), $(modules))
>
> __modinst: $(modules)
> @:
> diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
> index 55a72f5eb76d..f814a6acd200 100644
> --- a/scripts/Makefile.modpost
> +++ b/scripts/Makefile.modpost
> @@ -107,7 +107,10 @@ ifneq ($(KBUILD_MODPOST_WARN)$(missing-input),)
> modpost-args += -w
> endif
>
> -modorder-if-needed := $(if $(KBUILD_MODULES), $(MODORDER))
> +ifdef KBUILD_MODULES
> +modorder-if-needed := $(MODORDER)
> +modpost-args += -T $(MODORDER)
> +endif
>
> MODPOST = scripts/mod/modpost
>
> @@ -119,7 +122,7 @@ quiet_cmd_modpost = MODPOST $@
> echo >&2 "WARNING: $(missing-input) is missing."; \
> echo >&2 " Modules may not have dependencies or modversions."; \
> echo >&2 " You may get many unresolved symbol warnings.";) \
> - sed 's/ko$$/o/' $(or $(modorder-if-needed), /dev/null) | $(MODPOST) $(modpost-args) -T - $(vmlinux.o-if-present)
> + $(MODPOST) $(modpost-args) $(vmlinux.o-if-present)
>
> targets += $(output-symdump)
> $(output-symdump): $(modorder-if-needed) $(vmlinux.o-if-present) $(module.symvers-if-present) $(MODPOST) FORCE
> diff --git a/scripts/clang-tools/gen_compile_commands.py b/scripts/clang-tools/gen_compile_commands.py
> index d800b2c0af97..0227522959a4 100755
> --- a/scripts/clang-tools/gen_compile_commands.py
> +++ b/scripts/clang-tools/gen_compile_commands.py
> @@ -138,10 +138,10 @@ def cmdfiles_for_modorder(modorder):
> """
> with open(modorder) as f:
> for line in f:
> - ko = line.rstrip()
> - base, ext = os.path.splitext(ko)
> - if ext != '.ko':
> - sys.exit('{}: module path must end with .ko'.format(ko))
> + obj = line.rstrip()
> + base, ext = os.path.splitext(obj)
> + if ext != '.o':
> + sys.exit('{}: module path must end with .o'.format(obj))
> mod = base + '.mod'
> # Read from *.mod, to get a list of objects that compose the module.
> with open(mod) as m:
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 56d856f2e511..b48838a71bf6 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -1856,11 +1856,9 @@ static void read_symbols_from_files(const char *filename)
> FILE *in = stdin;
> char fname[PATH_MAX];
>
> - if (strcmp(filename, "-") != 0) {
> - in = fopen(filename, "r");
> - if (!in)
> - fatal("Can't open filenames file %s: %m", filename);
> - }
> + in = fopen(filename, "r");
> + if (!in)
> + fatal("Can't open filenames file %s: %m", filename);
>
> while (fgets(fname, PATH_MAX, in) != NULL) {
> if (strends(fname, "\n"))
> @@ -1868,8 +1866,7 @@ static void read_symbols_from_files(const char *filename)
> read_symbols(fname);
> }
>
> - if (in != stdin)
> - fclose(in);
> + fclose(in);
> }
>
> #define SZ 500
> diff --git a/scripts/modules-check.sh b/scripts/modules-check.sh
> index e06327722263..4c8da90de78e 100755
> --- a/scripts/modules-check.sh
> +++ b/scripts/modules-check.sh
> @@ -16,7 +16,7 @@ check_same_name_modules()
> for m in $(sed 's:.*/::' "$1" | sort | uniq -d)
> do
> echo "error: the following would cause module name conflict:" >&2
> - sed -n "/\/$m/s:^: :p" "$1" >&2
> + sed -n "/\/$m/s:^\(.*\)\.o\$: \1.ko:p" "$1" >&2
> exit_code=1
> done
> }
> --
> 2.34.1
>
--
Best Regards
Masahiro Yamada
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