linux-kernel - Re: [PATCH 1/4] modpost: do not invoke extra modpost for nsdeps

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Message-ID: <20191105163714.GC73159@google.com>
Date:   Tue, 5 Nov 2019 16:37:14 +0000
From:   Matthias Maennich <maennich@...gle.com>
To:     Masahiro Yamada <yamada.masahiro@...ionext.com>
Cc:     linux-kbuild@...r.kernel.org, Jessica Yu <jeyu@...nel.org>,
        Matthias Kaehlcke <mka@...omium.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] modpost: do not invoke extra modpost for nsdeps

On Tue, Oct 29, 2019 at 09:38:06PM +0900, Masahiro Yamada wrote:
>'make nsdeps' invokes the modpost three times at most; before linking
>vmlinux, before building modules, and finally for generating .ns_deps
>files. Running the modpost again and again is annoying.
>
>The last two can be unified. When the -d option is given, the modpost
>still does the usual job, and in addition, generates .ns_deps files.
>
>Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
>---

That is a very nice simplification of `make nsdeps`. Thanks!

Tested-by: Matthias Maennich <maennich@...gle.com>
Reviewed-by: Matthias Maennich <maennich@...gle.com>

Cheers,
Matthias

>
> Makefile                 | 5 ++---
> scripts/Makefile.modpost | 8 +++-----
> scripts/mod/modpost.c    | 9 ++-------
> 3 files changed, 7 insertions(+), 15 deletions(-)
>
>diff --git a/Makefile b/Makefile
>index 4f4d8979bfce..0ef897fd9cfd 100644
>--- a/Makefile
>+++ b/Makefile
>@@ -1682,10 +1682,9 @@ tags TAGS cscope gtags: FORCE
> # ---------------------------------------------------------------------------
>
> PHONY += nsdeps
>-
>+nsdeps: export KBUILD_NSDEPS=1
> nsdeps: modules
>-	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost nsdeps
>-	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/$@
>+	$(Q)$(CONFIG_SHELL) $(srctree)/scripts/nsdeps
>
> # Scripts to check various things for consistency
> # ---------------------------------------------------------------------------
>diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
>index 01c0a992d293..c9757b20b048 100644
>--- a/scripts/Makefile.modpost
>+++ b/scripts/Makefile.modpost
>@@ -53,8 +53,7 @@ MODPOST = scripts/mod/modpost						\
> 	$(if $(KBUILD_EXTMOD),$(addprefix -e ,$(KBUILD_EXTRA_SYMBOLS)))	\
> 	$(if $(KBUILD_EXTMOD),-o $(modulesymfile))			\
> 	$(if $(CONFIG_SECTION_MISMATCH_WARN_ONLY),,-E)			\
>-	$(if $(KBUILD_MODPOST_WARN),-w)					\
>-	$(if $(filter nsdeps,$(MAKECMDGOALS)),-d)
>+	$(if $(KBUILD_MODPOST_WARN),-w)
>
> ifdef MODPOST_VMLINUX
>
>@@ -66,7 +65,8 @@ __modpost:
>
> else
>
>-MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T -
>+MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - \
>+	$(if $(KBUILD_NSDEPS),-d)
>
> ifeq ($(KBUILD_EXTMOD),)
> MODPOST += $(wildcard vmlinux)
>@@ -97,8 +97,6 @@ ifneq ($(KBUILD_MODPOST_NOFINAL),1)
> 	$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modfinal
> endif
>
>-nsdeps: __modpost
>-
> endif
>
> .PHONY: $(PHONY)
>diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
>index 26ba97245576..dcd90d563ce8 100644
>--- a/scripts/mod/modpost.c
>+++ b/scripts/mod/modpost.c
>@@ -2221,8 +2221,7 @@ static int check_exports(struct module *mod)
> 			add_namespace(&mod->required_namespaces,
> 				      exp->namespace);
>
>-			if (!write_namespace_deps &&
>-			    !module_imports_namespace(mod, exp->namespace)) {
>+			if (!module_imports_namespace(mod, exp->namespace)) {
> 				warn("module %s uses symbol %s from namespace %s, but does not import it.\n",
> 				     basename, exp->name, exp->namespace);
> 			}
>@@ -2641,8 +2640,6 @@ int main(int argc, char **argv)
>
> 		err |= check_modname_len(mod);
> 		err |= check_exports(mod);
>-		if (write_namespace_deps)
>-			continue;
>
> 		add_header(&buf, mod);
> 		add_intree_flag(&buf, !external_module);
>@@ -2657,10 +2654,8 @@ int main(int argc, char **argv)
> 		write_if_changed(&buf, fname);
> 	}
>
>-	if (write_namespace_deps) {
>+	if (write_namespace_deps)
> 		write_namespace_deps_files();
>-		return 0;
>-	}
>
> 	if (dump_write)
> 		write_dump(dump_write);
>-- 
>2.17.1
>