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Subject[PATCH] kbuild: generate modules.builtin
To make it easier for tools like mkinitrd to detect whether a needed
module is missing or whether it is compiled into the kernel, install a
modules.builtin file listing all modules built into the kernel. This is
done by generating an alternate config file with all tristate =y options
set to =Y and reading the makefiles with this config included. The built
in modules then appear in obj-Y.

Known issues (found when comparing results with allyesconfig and
allmodconfig):
* ALSA makefiles do some substitutions on the CONFIG_*
variables sometimes, which breaks the logic if the alsa modules are
built-in. Patch sent to alsa-devel.
* samples/kobject/*.o could be compiled built-in, but doesn't show up
in modules.builtin (and not even in vmlinux.o). Patch sent to Greg to
make it module-only.
* net/{8021q/vlan_core,ethernet/pe2,ipv6/inet6_hashtables}.o are always
built-in, even though the corresponding config option is tristate:
obj-$(subst m,y,$(CONFIG_IPX)) += pe2.o
The result is that modules.builtin can contain three built-in
"modules" that can't possibly exist as modules. No fix for this so far,
as it is not a big issue IMO.
Signed-off-by: Michal Marek <mmarek@suse.cz>
---
.gitignore | 1 +
Makefile | 12 ++++++++--
scripts/Kbuild.include | 6 +++++
scripts/Makefile.lib | 5 +++-
scripts/Makefile.modbuiltin | 48 +++++++++++++++++++++++++++++++++++++++++++
scripts/kconfig/confdata.c | 48 ++++++++++++++++++++++++++++++++++++------
6 files changed, 109 insertions(+), 11 deletions(-)
create mode 100644 scripts/Makefile.modbuiltin
diff --git a/.gitignore b/.gitignore
index 51bd99d..7479069 100644
--- a/.gitignore
+++ b/.gitignore
@@ -22,6 +22,7 @@
*.lst
*.symtypes
*.order
+modules.builtin
*.elf
*.bin
*.gz
diff --git a/Makefile b/Makefile
index b57e1f5..d2265ba 100644
--- a/Makefile
+++ b/Makefile
@@ -878,6 +878,9 @@ $(sort $(vmlinux-init) $(vmlinux-main)) $(vmlinux-lds): $(vmlinux-dirs) ;
PHONY += $(vmlinux-dirs)
$(vmlinux-dirs): prepare scripts
$(Q)$(MAKE) $(build)=$@
+ifdef CONFIG_MODULES
+ $(Q)$(MAKE) $(modbuiltin)=$@
+endif

# Build the kernel release string
#
@@ -1133,6 +1136,7 @@ all: modules
PHONY += modules
modules: $(vmlinux-dirs) $(if $(KBUILD_BUILTIN),vmlinux)
$(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.order) > $(objtree)/modules.order
+ $(Q)$(AWK) '!x[$$0]++' $(vmlinux-dirs:%=$(objtree)/%/modules.builtin) > $(objtree)/modules.builtin
@$(kecho) ' Building modules, stage 2.';
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modpost
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.fwinst obj=firmware __fw_modbuild
@@ -1161,7 +1165,7 @@ _modinst_:
rm -f $(MODLIB)/build ; \
ln -s $(objtree) $(MODLIB)/build ; \
fi
- @cp -f $(objtree)/modules.order $(MODLIB)/
+ @cp -f $(objtree)/modules.{order,builtin} $(MODLIB)/
$(Q)$(MAKE) -f $(srctree)/scripts/Makefile.modinst

# This depmod is only for convenience to give the initial
@@ -1224,7 +1228,8 @@ clean: archclean $(clean-dirs)
\( -name '*.[oas]' -o -name '*.ko' -o -name '.*.cmd' \
-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
-o -name '*.symtypes' -o -name 'modules.order' \
- -o -name 'Module.markers' -o -name '.tmp_*.o.*' \) \
+ -o -name 'modules.builtin' -o -name 'Module.markers' \
+ -o -name '.tmp_*.o.*' \) \
-type f -print | xargs rm -f

# mrproper - Delete all generated files, including .config
@@ -1423,7 +1428,8 @@ $(clean-dirs):
clean: rm-dirs := $(MODVERDIR)
clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers \
$(KBUILD_EXTMOD)/Module.markers \
- $(KBUILD_EXTMOD)/modules.order
+ $(KBUILD_EXTMOD)/modules.order \
+ $(KBUILD_EXTMOD)/modules.builtin
clean: $(clean-dirs)
$(call cmd,rmdirs)
$(call cmd,rmfiles)
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index c29be8f..1cded3b 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -143,6 +143,12 @@ ld-option = $(call try-run,\
# $(Q)$(MAKE) $(build)=dir
build := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.build obj

+###
+# Shorthand for $(Q)$(MAKE) -f scripts/Makefile.modbuiltin obj=
+# Usage:
+# $(Q)$(MAKE) $(modbuiltin)=dir
+modbuiltin := -f $(if $(KBUILD_SRC),$(srctree)/)scripts/Makefile.modbuiltin obj
+
# Prefix -I with $(srctree) if it is not an absolute path.
# skip if -I has no parameter
addtree = $(if $(patsubst -I%,%,$(1)), \
diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib
index cba61ca..427375e 100644
--- a/scripts/Makefile.lib
+++ b/scripts/Makefile.lib
@@ -37,6 +37,8 @@ modorder := $(patsubst %/,%/modules.order, $(filter %/, $(obj-y)) $(obj-m:.o=.ko

__subdir-y := $(patsubst %/,%,$(filter %/, $(obj-y)))
subdir-y += $(__subdir-y)
+__subdir-Y := $(patsubst %/,%,$(filter %/, $(obj-Y)))
+subdir-Y += $(__subdir-Y)
__subdir-m := $(patsubst %/,%,$(filter %/, $(obj-m)))
subdir-m += $(__subdir-m)
obj-y := $(patsubst %/, %/built-in.o, $(obj-y))
@@ -44,7 +46,7 @@ obj-m := $(filter-out %/, $(obj-m))

# Subdirectories we need to descend into

-subdir-ym := $(sort $(subdir-y) $(subdir-m))
+subdir-ym := $(sort $(subdir-y) $(subdir-Y) $(subdir-m))

# if $(foo-objs) exists, foo.o is a composite object
multi-used-y := $(sort $(foreach m,$(obj-y), $(if $(strip $($(m:.o=-objs)) $($(m:.o=-y))), $(m))))
@@ -76,6 +78,7 @@ always := $(addprefix $(obj)/,$(always))
targets := $(addprefix $(obj)/,$(targets))
modorder := $(addprefix $(obj)/,$(modorder))
obj-y := $(addprefix $(obj)/,$(obj-y))
+obj-Y := $(addprefix $(obj)/,$(obj-Y))
obj-m := $(addprefix $(obj)/,$(obj-m))
lib-y := $(addprefix $(obj)/,$(lib-y))
subdir-obj-y := $(addprefix $(obj)/,$(subdir-obj-y))
diff --git a/scripts/Makefile.modbuiltin b/scripts/Makefile.modbuiltin
new file mode 100644
index 0000000..55e1885
--- /dev/null
+++ b/scripts/Makefile.modbuiltin
@@ -0,0 +1,48 @@
+# ==========================================================================
+# Generating modules.builtin
+# ==========================================================================
+
+src := $(obj)
+
+PHONY := __modbuiltin
+__modbuiltin:
+
+# Read auto2.conf which sets tristate variables to 'Y' instead of 'y'
+# That way, we get the list of built-in modules in obj-Y
+-include include/config/auto2.conf
+
+include scripts/Kbuild.include
+
+# The filename Kbuild has precedence over Makefile
+kbuild-dir := $(if $(filter /%,$(src)),$(src),$(srctree)/$(src))
+kbuild-file := $(if $(wildcard $(kbuild-dir)/Kbuild),$(kbuild-dir)/Kbuild,$(kbuild-dir)/Makefile)
+include $(kbuild-file)
+
+include scripts/Makefile.lib
+
+modbuiltin-subdirs := $(patsubst %,%/modules.builtin, $(subdir-ym))
+modbuiltin-mods := $(filter %.ko, $(obj-Y:.o=.ko))
+modbuiltin-target := $(obj)/modules.builtin
+
+__modbuiltin: $(modbuiltin-target) $(subdir-ym)
+ @:
+
+modbuiltin-cmds = \
+ for m in $(modbuiltin-mods); do echo kernel/$$m; done; \
+ cat /dev/null $(modbuiltin-subdirs);
+
+$(modbuiltin-target): $(subdir-ym)
+ $(Q)($(modbuiltin-cmds)) > $@
+
+# Descending
+# ---------------------------------------------------------------------------
+
+PHONY += $(subdir-ym)
+$(subdir-ym):
+ $(Q)$(MAKE) $(modbuiltin)=$@
+
+
+# Declare the contents of the .PHONY variable as phony. We keep that
+# information in a variable se we can use it in if_changed and friends.
+
+.PHONY: $(PHONY)
diff --git a/scripts/kconfig/confdata.c b/scripts/kconfig/confdata.c
index 273d738..4982aa2 100644
--- a/scripts/kconfig/confdata.c
+++ b/scripts/kconfig/confdata.c
@@ -666,12 +666,27 @@ out:
return res;
}

+int fprintf2(FILE *f1, FILE *f2, const char *fmt, ...)
+{
+ va_list ap;
+ int res;
+
+ va_start(ap, fmt);
+ vfprintf(f1, fmt, ap);
+ va_end(ap);
+ va_start(ap, fmt);
+ res = vfprintf(f2, fmt, ap);
+ va_end(ap);
+
+ return res;
+}
+
int conf_write_autoconf(void)
{
struct symbol *sym;
const char *str;
char *name;
- FILE *out, *out_h;
+ FILE *out, *out2, *out_h;
time_t now;
int i, l;

@@ -686,16 +701,23 @@ int conf_write_autoconf(void)
if (!out)
return 1;

+ out2 = fopen(".tmpconfig2", "w");
+ if (!out2) {
+ fclose(out);
+ return 1;
+ }
+
out_h = fopen(".tmpconfig.h", "w");
if (!out_h) {
fclose(out);
+ fclose(out2);
return 1;
}

sym = sym_lookup("KERNELVERSION", 0);
sym_calc_value(sym);
time(&now);
- fprintf(out, "#\n"
+ fprintf2(out, out2, "#\n"
"# Automatically generated make config: don't edit\n"
"# Linux kernel version: %s\n"
"# %s"
@@ -720,45 +742,51 @@ int conf_write_autoconf(void)
case no:
break;
case mod:
- fprintf(out, "CONFIG_%s=m\n", sym->name);
+ fprintf2(out, out2, "CONFIG_%s=m\n",
+ sym->name);
fprintf(out_h, "#define CONFIG_%s_MODULE 1\n", sym->name);
break;
case yes:
fprintf(out, "CONFIG_%s=y\n", sym->name);
+ fprintf(out2, "CONFIG_%s=%c\n", sym->name,
+ sym->type == S_BOOLEAN ? 'y' : 'Y');
fprintf(out_h, "#define CONFIG_%s 1\n", sym->name);
break;
}
break;
case S_STRING:
str = sym_get_string_value(sym);
- fprintf(out, "CONFIG_%s=\"", sym->name);
+ fprintf2(out, out2, "CONFIG_%s=\"", sym->name);
fprintf(out_h, "#define CONFIG_%s \"", sym->name);
while (1) {
l = strcspn(str, "\"\\");
if (l) {
fwrite(str, l, 1, out);
+ fwrite(str, l, 1, out2);
fwrite(str, l, 1, out_h);
str += l;
}
if (!*str)
break;
- fprintf(out, "\\%c", *str);
+ fprintf2(out, out2, "\\%c", *str);
fprintf(out_h, "\\%c", *str);
str++;
}
fputs("\"\n", out);
+ fputs("\"\n", out2);
fputs("\"\n", out_h);
break;
case S_HEX:
str = sym_get_string_value(sym);
if (str[0] != '0' || (str[1] != 'x' && str[1] != 'X')) {
- fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
+ fprintf2(out, out2, "CONFIG_%s=%s\n",
+ sym->name, str);
fprintf(out_h, "#define CONFIG_%s 0x%s\n", sym->name, str);
break;
}
case S_INT:
str = sym_get_string_value(sym);
- fprintf(out, "CONFIG_%s=%s\n", sym->name, str);
+ fprintf2(out, out2, "CONFIG_%s=%s\n", sym->name, str);
fprintf(out_h, "#define CONFIG_%s %s\n", sym->name, str);
break;
default:
@@ -766,6 +794,7 @@ int conf_write_autoconf(void)
}
}
fclose(out);
+ fclose(out2);
fclose(out_h);

name = getenv("KCONFIG_AUTOHEADER");
@@ -773,6 +802,11 @@ int conf_write_autoconf(void)
name = "include/linux/autoconf.h";
if (rename(".tmpconfig.h", name))
return 1;
+ name = getenv("KCONFIG_AUTOCONFIG2");
+ if (!name)
+ name = "include/config/auto2.conf";
+ if (rename(".tmpconfig2", name))
+ return 1;
name = getenv("KCONFIG_AUTOCONFIG");
if (!name)
name = "include/config/auto.conf";
--
1.6.3

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