LinuxLists.cc - [PATCH 2/4] modpost: dump missing namespaces into a single modules.nsdeps file

2019-10-29 12:40:13

Subject: [PATCH 2/4] modpost: dump missing namespaces into a single modules.nsdeps file

The modpost, with the -d option given, generates per-module .ns_deps
files.

Kbuild generates per-module .mod files to carry module information.
This is convenient because Make handles multiple jobs when the -j
option is given.

On the other hand, the modpost always runs as a single thread.
I do not see a strong reason to produce separate .ns_deps files.

This commit changes the modpost to generate just one file,
modules.nsdeps, each line of which has the following format:

<module_name>: <list of missing namespaces>

Please note it contains *missing* namespaces instead of required ones.
So, modules.nsdeps is empty if the namespace dependency is all good.

This will work more efficiently because spatch will no longer process
already imported namespaces. I removed the '(if needed)' from the
nsdeps log since spatch is invoked only when needed.

This also solved the stale .ns_deps files problem reported by
Jessica Yu:

https://lkml.org/lkml/2019/10/28/467

While I was here, I improved the modpost code a little more;
I freed ns_deps_bus.p because buf_write() allocates memory.

Signed-off-by: Masahiro Yamada <[email protected]>
---

.gitignore | 2 +-
Documentation/dontdiff | 1 +
Makefile | 4 ++--
scripts/Makefile.modpost | 2 +-
scripts/mod/modpost.c | 44 +++++++++++++++++-----------------------
scripts/mod/modpost.h | 4 ++--
scripts/nsdeps | 21 +++++++++----------
7 files changed, 36 insertions(+), 42 deletions(-)

diff --git a/.gitignore b/.gitignore
index 70580bdd352c..72ef86a5570d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -32,7 +32,6 @@
*.lzo
*.mod
*.mod.c
-*.ns_deps
*.o
*.o.*
*.patch
@@ -61,6 +60,7 @@ modules.order
/System.map
/Module.markers
/modules.builtin.modinfo
+/modules.nsdeps

#
# RPM spec file (make rpm-pkg)
diff --git a/Documentation/dontdiff b/Documentation/dontdiff
index 9f4392876099..72fc2e9e2b63 100644
--- a/Documentation/dontdiff
+++ b/Documentation/dontdiff
@@ -179,6 +179,7 @@ mkutf8data
modpost
modules.builtin
modules.builtin.modinfo
+modules.nsdeps
modules.order
modversions.h*
nconf
diff --git a/Makefile b/Makefile
index 0ef897fd9cfd..1e3f307bd49b 100644
--- a/Makefile
+++ b/Makefile
@@ -1356,7 +1356,7 @@ endif # CONFIG_MODULES

# Directories & files removed with 'make clean'
CLEAN_DIRS += include/ksym
-CLEAN_FILES += modules.builtin.modinfo
+CLEAN_FILES += modules.builtin.modinfo modules.nsdeps

# Directories & files removed with 'make mrproper'
MRPROPER_DIRS += include/config include/generated \
@@ -1660,7 +1660,7 @@ clean: $(clean-dirs)
-o -name '*.ko.*' \
-o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
-o -name '*.dwo' -o -name '*.lst' \
- -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \
+ -o -name '*.su' -o -name '*.mod' \
-o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
-o -name '*.lex.c' -o -name '*.tab.[ch]' \
-o -name '*.asn1.[ch]' \
diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
index c9757b20b048..da37128c3f9f 100644
--- a/scripts/Makefile.modpost
+++ b/scripts/Makefile.modpost
@@ -66,7 +66,7 @@ __modpost:
else

MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - \
- $(if $(KBUILD_NSDEPS),-d)
+ $(if $(KBUILD_NSDEPS),-d modules.nsdeps)

ifeq ($(KBUILD_EXTMOD),)
MODPOST += $(wildcard vmlinux)
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index dcd90d563ce8..f7425f5d4ab0 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -38,8 +38,6 @@ static int sec_mismatch_count = 0;
static int sec_mismatch_fatal = 0;
/* ignore missing files */
static int ignore_missing_files;
-/* write namespace dependencies */
-static int write_namespace_deps;

enum export {
export_plain, export_unused, export_gpl,
@@ -2217,14 +2215,11 @@ static int check_exports(struct module *mod)
else
basename = mod->name;

- if (exp->namespace) {
- add_namespace(&mod->required_namespaces,
- 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);
- }
+ if (exp->namespace &&
+ !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);
+ add_namespace(&mod->missing_namespaces, exp->namespace);
}

if (!mod->gpl_compatible)
@@ -2525,29 +2520,27 @@ static void write_dump(const char *fname)
free(buf.p);
}

-static void write_namespace_deps_files(void)
+static void write_namespace_deps_files(const char *fname)
{
struct module *mod;
struct namespace_list *ns;
struct buffer ns_deps_buf = {};

for (mod = modules; mod; mod = mod->next) {
- char fname[PATH_MAX];

- if (mod->skip)
+ if (mod->skip || !mod->missing_namespaces)
continue;

- ns_deps_buf.pos = 0;
+ buf_printf(&ns_deps_buf, "%s.ko:", mod->name);

- for (ns = mod->required_namespaces; ns; ns = ns->next)
- buf_printf(&ns_deps_buf, "%s\n", ns->namespace);
+ for (ns = mod->missing_namespaces; ns; ns = ns->next)
+ buf_printf(&ns_deps_buf, " %s", ns->namespace);

- if (ns_deps_buf.pos == 0)
- continue;
-
- sprintf(fname, "%s.ns_deps", mod->name);
- write_if_changed(&ns_deps_buf, fname);
+ buf_printf(&ns_deps_buf, "\n");
}
+
+ write_if_changed(&ns_deps_buf, fname);
+ free(ns_deps_buf.p);
}

struct ext_sym_list {
@@ -2560,6 +2553,7 @@ int main(int argc, char **argv)
struct module *mod;
struct buffer buf = { };
char *kernel_read = NULL;
+ char *missing_namespace_deps = NULL;
char *dump_write = NULL, *files_source = NULL;
int opt;
int err;
@@ -2567,7 +2561,7 @@ int main(int argc, char **argv)
struct ext_sym_list *extsym_iter;
struct ext_sym_list *extsym_start = NULL;

- while ((opt = getopt(argc, argv, "i:e:mnsT:o:awEd")) != -1) {
+ while ((opt = getopt(argc, argv, "i:e:mnsT:o:awEd:")) != -1) {
switch (opt) {
case 'i':
kernel_read = optarg;
@@ -2606,7 +2600,7 @@ int main(int argc, char **argv)
sec_mismatch_fatal = 1;
break;
case 'd':
- write_namespace_deps = 1;
+ missing_namespace_deps = optarg;
break;
default:
exit(1);
@@ -2654,8 +2648,8 @@ int main(int argc, char **argv)
write_if_changed(&buf, fname);
}

- if (write_namespace_deps)
- write_namespace_deps_files();
+ if (missing_namespace_deps)
+ write_namespace_deps_files(missing_namespace_deps);

if (dump_write)
write_dump(dump_write);
diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
index ad271bc6c313..fe6652535e4b 100644
--- a/scripts/mod/modpost.h
+++ b/scripts/mod/modpost.h
@@ -126,8 +126,8 @@ struct module {
struct buffer dev_table_buf;
char srcversion[25];
int is_dot_o;
- // Required namespace dependencies
- struct namespace_list *required_namespaces;
+ // Missing namespace dependencies
+ struct namespace_list *missing_namespaces;
// Actual imported namespaces
struct namespace_list *imported_namespaces;
};
diff --git a/scripts/nsdeps b/scripts/nsdeps
index dda6fbac016e..08db427a7fe5 100644
--- a/scripts/nsdeps
+++ b/scripts/nsdeps
@@ -27,15 +27,14 @@ generate_deps_for_ns() {
}

generate_deps() {
- local mod_name=`basename $@ .ko`
- local mod_file=`echo $@ | sed -e 's/\.ko/\.mod/'`
- local ns_deps_file=`echo $@ | sed -e 's/\.ko/\.ns_deps/'`
- if [ ! -f "$ns_deps_file" ]; then return; fi
- local mod_source_files=`cat $mod_file | sed -n 1p \
+ local mod=${1%.ko:}
+ shift
+ local namespaces="$*"
+ local mod_source_files=`cat $mod.mod | sed -n 1p \
| sed -e 's/\.o/\.c/g' \
| sed "s|[^ ]* *|${srctree}/&|g"`
- for ns in `cat $ns_deps_file`; do
- echo "Adding namespace $ns to module $mod_name (if needed)."
+ for ns in $namespaces; do
+ echo "Adding namespace $ns to module $mod.ko."
generate_deps_for_ns $ns $mod_source_files
# sort the imports
for source_file in $mod_source_files; do
@@ -52,7 +51,7 @@ generate_deps() {
done
}

-for f in `cat $objtree/modules.order`; do
- generate_deps $f
-done
-
+while read line
+do
+ generate_deps $line
+done < modules.nsdeps
--
2.17.1

2019-10-30 20:14:53

by Jessica Yu

[permalink] [raw]

Subject: Re: [PATCH 2/4] modpost: dump missing namespaces into a single modules.nsdeps file

+++ Masahiro Yamada [29/10/19 21:38 +0900]:
>The modpost, with the -d option given, generates per-module .ns_deps
>files.
>
>Kbuild generates per-module .mod files to carry module information.
>This is convenient because Make handles multiple jobs when the -j
>option is given.
>
>On the other hand, the modpost always runs as a single thread.
>I do not see a strong reason to produce separate .ns_deps files.
>
>This commit changes the modpost to generate just one file,
>modules.nsdeps, each line of which has the following format:
>
> <module_name>: <list of missing namespaces>
>
>Please note it contains *missing* namespaces instead of required ones.
>So, modules.nsdeps is empty if the namespace dependency is all good.
>
>This will work more efficiently because spatch will no longer process
>already imported namespaces. I removed the '(if needed)' from the
>nsdeps log since spatch is invoked only when needed.

This is a nice optimization! :-)

>This also solved the stale .ns_deps files problem reported by
>Jessica Yu:
>
> https://lkml.org/lkml/2019/10/28/467

Tested-by: Jessica Yu <[email protected]>
Acked-by: Jessica Yu <[email protected]>

Thanks for the fix!

>While I was here, I improved the modpost code a little more;
>I freed ns_deps_bus.p because buf_write() allocates memory.
>
>Signed-off-by: Masahiro Yamada <[email protected]>
>---
>
> .gitignore | 2 +-
> Documentation/dontdiff | 1 +
> Makefile | 4 ++--
> scripts/Makefile.modpost | 2 +-
> scripts/mod/modpost.c | 44 +++++++++++++++++-----------------------
> scripts/mod/modpost.h | 4 ++--
> scripts/nsdeps | 21 +++++++++----------
> 7 files changed, 36 insertions(+), 42 deletions(-)
>
>diff --git a/.gitignore b/.gitignore
>index 70580bdd352c..72ef86a5570d 100644
>--- a/.gitignore
>+++ b/.gitignore
>@@ -32,7 +32,6 @@
> *.lzo
> *.mod
> *.mod.c
>-*.ns_deps
> *.o
> *.o.*
> *.patch
>@@ -61,6 +60,7 @@ modules.order
> /System.map
> /Module.markers
> /modules.builtin.modinfo
>+/modules.nsdeps
>
> #
> # RPM spec file (make rpm-pkg)
>diff --git a/Documentation/dontdiff b/Documentation/dontdiff
>index 9f4392876099..72fc2e9e2b63 100644
>--- a/Documentation/dontdiff
>+++ b/Documentation/dontdiff
>@@ -179,6 +179,7 @@ mkutf8data
> modpost
> modules.builtin
> modules.builtin.modinfo
>+modules.nsdeps
> modules.order
> modversions.h*
> nconf
>diff --git a/Makefile b/Makefile
>index 0ef897fd9cfd..1e3f307bd49b 100644
>--- a/Makefile
>+++ b/Makefile
>@@ -1356,7 +1356,7 @@ endif # CONFIG_MODULES
>
> # Directories & files removed with 'make clean'
> CLEAN_DIRS += include/ksym
>-CLEAN_FILES += modules.builtin.modinfo
>+CLEAN_FILES += modules.builtin.modinfo modules.nsdeps
>
> # Directories & files removed with 'make mrproper'
> MRPROPER_DIRS += include/config include/generated \
>@@ -1660,7 +1660,7 @@ clean: $(clean-dirs)
> -o -name '*.ko.*' \
> -o -name '*.dtb' -o -name '*.dtb.S' -o -name '*.dt.yaml' \
> -o -name '*.dwo' -o -name '*.lst' \
>- -o -name '*.su' -o -name '*.mod' -o -name '*.ns_deps' \
>+ -o -name '*.su' -o -name '*.mod' \
> -o -name '.*.d' -o -name '.*.tmp' -o -name '*.mod.c' \
> -o -name '*.lex.c' -o -name '*.tab.[ch]' \
> -o -name '*.asn1.[ch]' \
>diff --git a/scripts/Makefile.modpost b/scripts/Makefile.modpost
>index c9757b20b048..da37128c3f9f 100644
>--- a/scripts/Makefile.modpost
>+++ b/scripts/Makefile.modpost
>@@ -66,7 +66,7 @@ __modpost:
> else
>
> MODPOST += $(subst -i,-n,$(filter -i,$(MAKEFLAGS))) -s -T - \
>- $(if $(KBUILD_NSDEPS),-d)
>+ $(if $(KBUILD_NSDEPS),-d modules.nsdeps)
>
> ifeq ($(KBUILD_EXTMOD),)
> MODPOST += $(wildcard vmlinux)
>diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
>index dcd90d563ce8..f7425f5d4ab0 100644
>--- a/scripts/mod/modpost.c
>+++ b/scripts/mod/modpost.c
>@@ -38,8 +38,6 @@ static int sec_mismatch_count = 0;
> static int sec_mismatch_fatal = 0;
> /* ignore missing files */
> static int ignore_missing_files;
>-/* write namespace dependencies */
>-static int write_namespace_deps;
>
> enum export {
> export_plain, export_unused, export_gpl,
>@@ -2217,14 +2215,11 @@ static int check_exports(struct module *mod)
> else
> basename = mod->name;
>
>- if (exp->namespace) {
>- add_namespace(&mod->required_namespaces,
>- 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);
>- }
>+ if (exp->namespace &&
>+ !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);
>+ add_namespace(&mod->missing_namespaces, exp->namespace);
> }
>
> if (!mod->gpl_compatible)
>@@ -2525,29 +2520,27 @@ static void write_dump(const char *fname)
> free(buf.p);
> }
>
>-static void write_namespace_deps_files(void)
>+static void write_namespace_deps_files(const char *fname)
> {
> struct module *mod;
> struct namespace_list *ns;
> struct buffer ns_deps_buf = {};
>
> for (mod = modules; mod; mod = mod->next) {
>- char fname[PATH_MAX];
>
>- if (mod->skip)
>+ if (mod->skip || !mod->missing_namespaces)
> continue;
>
>- ns_deps_buf.pos = 0;
>+ buf_printf(&ns_deps_buf, "%s.ko:", mod->name);
>
>- for (ns = mod->required_namespaces; ns; ns = ns->next)
>- buf_printf(&ns_deps_buf, "%s\n", ns->namespace);
>+ for (ns = mod->missing_namespaces; ns; ns = ns->next)
>+ buf_printf(&ns_deps_buf, " %s", ns->namespace);
>
>- if (ns_deps_buf.pos == 0)
>- continue;
>-
>- sprintf(fname, "%s.ns_deps", mod->name);
>- write_if_changed(&ns_deps_buf, fname);
>+ buf_printf(&ns_deps_buf, "\n");
> }
>+
>+ write_if_changed(&ns_deps_buf, fname);
>+ free(ns_deps_buf.p);
> }
>
> struct ext_sym_list {
>@@ -2560,6 +2553,7 @@ int main(int argc, char **argv)
> struct module *mod;
> struct buffer buf = { };
> char *kernel_read = NULL;
>+ char *missing_namespace_deps = NULL;
> char *dump_write = NULL, *files_source = NULL;
> int opt;
> int err;
>@@ -2567,7 +2561,7 @@ int main(int argc, char **argv)
> struct ext_sym_list *extsym_iter;
> struct ext_sym_list *extsym_start = NULL;
>
>- while ((opt = getopt(argc, argv, "i:e:mnsT:o:awEd")) != -1) {
>+ while ((opt = getopt(argc, argv, "i:e:mnsT:o:awEd:")) != -1) {
> switch (opt) {
> case 'i':
> kernel_read = optarg;
>@@ -2606,7 +2600,7 @@ int main(int argc, char **argv)
> sec_mismatch_fatal = 1;
> break;
> case 'd':
>- write_namespace_deps = 1;
>+ missing_namespace_deps = optarg;
> break;
> default:
> exit(1);
>@@ -2654,8 +2648,8 @@ int main(int argc, char **argv)
> write_if_changed(&buf, fname);
> }
>
>- if (write_namespace_deps)
>- write_namespace_deps_files();
>+ if (missing_namespace_deps)
>+ write_namespace_deps_files(missing_namespace_deps);
>
> if (dump_write)
> write_dump(dump_write);
>diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
>index ad271bc6c313..fe6652535e4b 100644
>--- a/scripts/mod/modpost.h
>+++ b/scripts/mod/modpost.h
>@@ -126,8 +126,8 @@ struct module {
> struct buffer dev_table_buf;
> char srcversion[25];
> int is_dot_o;
>- // Required namespace dependencies
>- struct namespace_list *required_namespaces;
>+ // Missing namespace dependencies
>+ struct namespace_list *missing_namespaces;
> // Actual imported namespaces
> struct namespace_list *imported_namespaces;
> };
>diff --git a/scripts/nsdeps b/scripts/nsdeps
>index dda6fbac016e..08db427a7fe5 100644
>--- a/scripts/nsdeps
>+++ b/scripts/nsdeps
>@@ -27,15 +27,14 @@ generate_deps_for_ns() {
> }
>
> generate_deps() {
>- local mod_name=`basename $@ .ko`
>- local mod_file=`echo $@ | sed -e 's/\.ko/\.mod/'`
>- local ns_deps_file=`echo $@ | sed -e 's/\.ko/\.ns_deps/'`
>- if [ ! -f "$ns_deps_file" ]; then return; fi
>- local mod_source_files=`cat $mod_file | sed -n 1p \
>+ local mod=${1%.ko:}
>+ shift
>+ local namespaces="$*"
>+ local mod_source_files=`cat $mod.mod | sed -n 1p \
> | sed -e 's/\.o/\.c/g' \
> | sed "s|[^ ]* *|${srctree}/&|g"`
>- for ns in `cat $ns_deps_file`; do
>- echo "Adding namespace $ns to module $mod_name (if needed)."
>+ for ns in $namespaces; do
>+ echo "Adding namespace $ns to module $mod.ko."
> generate_deps_for_ns $ns $mod_source_files
> # sort the imports
> for source_file in $mod_source_files; do
>@@ -52,7 +51,7 @@ generate_deps() {
> done
> }
>
>-for f in `cat $objtree/modules.order`; do
>- generate_deps $f
>-done
>-
>+while read line
>+do
>+ generate_deps $line
>+done < modules.nsdeps
>--
>2.17.1
>

2019-10-31 11:21:54

by Jessica Yu

[permalink] [raw]

Subject: Re: [PATCH 2/4] modpost: dump missing namespaces into a single modules.nsdeps file

2019-10-31 11:55:11

by Masahiro Yamada

[permalink] [raw]

Subject: Re: [PATCH 2/4] modpost: dump missing namespaces into a single modules.nsdeps file

On Thu, Oct 31, 2019 at 8:20 PM Jessica Yu <[email protected]> wrote:
>
> +++ Masahiro Yamada [29/10/19 21:38 +0900]:
> >The modpost, with the -d option given, generates per-module .ns_deps
> >files.
> >
> >Kbuild generates per-module .mod files to carry module information.
> >This is convenient because Make handles multiple jobs when the -j
> >option is given.
> >
> >On the other hand, the modpost always runs as a single thread.
> >I do not see a strong reason to produce separate .ns_deps files.
> >
> >This commit changes the modpost to generate just one file,
> >modules.nsdeps, each line of which has the following format:
> >
> > <module_name>: <list of missing namespaces>
> >
> >Please note it contains *missing* namespaces instead of required ones.
> >So, modules.nsdeps is empty if the namespace dependency is all good.
> >
> >This will work more efficiently because spatch will no longer process
> >already imported namespaces. I removed the '(if needed)' from the
> >nsdeps log since spatch is invoked only when needed.
> >
> >This also solved the stale .ns_deps files problem reported by
> >Jessica Yu:
> >
> > https://lkml.org/lkml/2019/10/28/467
> >
> >While I was here, I improved the modpost code a little more;
> >I freed ns_deps_bus.p because buf_write() allocates memory.
> >
> >Signed-off-by: Masahiro Yamada <[email protected]>
> >---
> >
> > .gitignore | 2 +-
> > Documentation/dontdiff | 1 +
> > Makefile | 4 ++--
> > scripts/Makefile.modpost | 2 +-
> > scripts/mod/modpost.c | 44 +++++++++++++++++-----------------------
> > scripts/mod/modpost.h | 4 ++--
> > scripts/nsdeps | 21 +++++++++----------
> > 7 files changed, 36 insertions(+), 42 deletions(-)
> >
> >diff --git a/.gitignore b/.gitignore
> >index 70580bdd352c..72ef86a5570d 100644
> >--- a/.gitignore
> >+++ b/.gitignore
> >@@ -32,7 +32,6 @@
> > *.lzo
> > *.mod
> > *.mod.c
> >-*.ns_deps
> > *.o
> > *.o.*
> > *.patch
> >@@ -61,6 +60,7 @@ modules.order
> > /System.map
> > /Module.markers
> > /modules.builtin.modinfo
> >+/modules.nsdeps
> >
> > #
> > # RPM spec file (make rpm-pkg)
> >diff --git a/Documentation/dontdiff b/Documentation/dontdiff
> >index 9f4392876099..72fc2e9e2b63 100644
> >--- a/Documentation/dontdiff
> >+++ b/Documentation/dontdiff
> >@@ -179,6 +179,7 @@ mkutf8data
> > modpost
> > modules.builtin
> > modules.builtin.modinfo
> >+modules.nsdeps
> > modules.order
> > modversions.h*
> > nconf
> >diff --git a/Makefile b/Makefile
> >index 0ef897fd9cfd..1e3f307bd49b 100644
> >--- a/Makefile
> >+++ b/Makefile
> >@@ -1356,7 +1356,7 @@ endif # CONFIG_MODULES
> >
> > # Directories & files removed with 'make clean'
> > CLEAN_DIRS += include/ksym
> >-CLEAN_FILES += modules.builtin.modinfo
> >+CLEAN_FILES += modules.builtin.modinfo modules.nsdeps
>
> Hmm, I tried to run `make -C path/to/kernel/src M=$(PWD) clean` for a test
> external module, but it didn't remove modules.nsdeps for me. I declared a
> MODULE namespace for testing purposes.
>
> $ make
> make -C /dev/shm/linux M=/tmp/ppyu/test-module
> make[1]: Entering directory '/dev/shm/linux'
> AR /tmp/ppyu/test-module/built-in.a
> CC [M] /tmp/ppyu/test-module/test1.o
> CC [M] /tmp/ppyu/test-module/test2.o
> LD [M] /tmp/ppyu/test-module/test.o
> Building modules, stage 2.
> MODPOST 1 modules
> WARNING: module test uses symbol try_module_get from namespace MODULE, but does not import it.
> CC [M] /tmp/ppyu/test-module/test.mod.o
> LD [M] /tmp/ppyu/test-module/test.ko
> make[1]: Leaving directory '/dev/shm/linux'
>
> Then I make nsdeps:
>
> make -C /dev/shm/linux M=/tmp/ppyu/test-module nsdeps
> make[1]: Entering directory '/dev/shm/linux'
> Building modules, stage 2.
> MODPOST 1 modules
> WARNING: module test uses symbol try_module_get from namespace MODULE, but does not import it.
> Adding namespace MODULE to module /tmp/ppyu/test-module/test.ko.
> --- /tmp/ppyu/test-module/test1.c
> +++ /tmp/cocci-output-3696-c1f8b3-test1.c
> @@ -38,3 +38,4 @@ static void __exit hello_cleanup(void)
> module_init(hello_init);
> module_exit(hello_cleanup);
> MODULE_LICENSE("GPL");
> +MODULE_IMPORT_NS(MODULE);
> make[1]: Leaving directory '/dev/shm/linux'
> $ cat modules.nsdeps
> /tmp/ppyu/test-module/test.ko: MODULE
>
> Looks good so far, then I try make clean:
>
> $ make clean
> make -C /dev/shm/linux M=/tmp/ppyu/test-module clean
> make[1]: Entering directory '/dev/shm/linux'
> CLEAN /tmp/ppyu/test-module/Module.symvers
> make[1]: Leaving directory '/dev/shm/linux'
> $ ls
> Makefile modules.nsdeps test1.c test2.c
>
> But modules.nsdeps is still there.
>

Good catch!

I forgot to take care of it for external module builds.

The following should work. I will fold it in 3/4.

diff --git a/Makefile b/Makefile
index 79be70bf2899..6035702803eb 100644
--- a/Makefile
+++ b/Makefile
@@ -1619,7 +1619,7 @@ _emodinst_post: _emodinst_
$(call cmd,depmod)

clean-dirs := $(KBUILD_EXTMOD)
-clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
+clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
$(KBUILD_EXTMOD)/modules.nsdeps

PHONY += /
/:

--
Best Regards
Masahiro Yamada

2019-11-06 15:26:06

by Matthias Männich

[permalink] [raw]

Subject: Re: [PATCH 2/4] modpost: dump missing namespaces into a single modules.nsdeps file

On Thu, Oct 31, 2019 at 08:53:25PM +0900, Masahiro Yamada wrote:
>On Thu, Oct 31, 2019 at 8:20 PM Jessica Yu <[email protected]> wrote:
>>
>> +++ Masahiro Yamada [29/10/19 21:38 +0900]:
>> >The modpost, with the -d option given, generates per-module .ns_deps
>> >files.
>> >
>> >Kbuild generates per-module .mod files to carry module information.
>> >This is convenient because Make handles multiple jobs when the -j
>> >option is given.
>> >
>> >On the other hand, the modpost always runs as a single thread.
>> >I do not see a strong reason to produce separate .ns_deps files.
>> >
>> >This commit changes the modpost to generate just one file,
>> >modules.nsdeps, each line of which has the following format:
>> >
>> > <module_name>: <list of missing namespaces>
>> >
>> >Please note it contains *missing* namespaces instead of required ones.
>> >So, modules.nsdeps is empty if the namespace dependency is all good.
>> >
>> >This will work more efficiently because spatch will no longer process
>> >already imported namespaces. I removed the '(if needed)' from the
>> >nsdeps log since spatch is invoked only when needed.
>> >
>> >This also solved the stale .ns_deps files problem reported by
>> >Jessica Yu:
>> >
>> > https://lkml.org/lkml/2019/10/28/467
>> >
>> >While I was here, I improved the modpost code a little more;
>> >I freed ns_deps_bus.p because buf_write() allocates memory.
>> >
>> >Signed-off-by: Masahiro Yamada <[email protected]>
>> >---
>> >
>> > .gitignore | 2 +-
>> > Documentation/dontdiff | 1 +
>> > Makefile | 4 ++--
>> > scripts/Makefile.modpost | 2 +-
>> > scripts/mod/modpost.c | 44 +++++++++++++++++-----------------------
>> > scripts/mod/modpost.h | 4 ++--
>> > scripts/nsdeps | 21 +++++++++----------
>> > 7 files changed, 36 insertions(+), 42 deletions(-)
>> >
>> >diff --git a/.gitignore b/.gitignore
>> >index 70580bdd352c..72ef86a5570d 100644
>> >--- a/.gitignore
>> >+++ b/.gitignore
>> >@@ -32,7 +32,6 @@
>> > *.lzo
>> > *.mod
>> > *.mod.c
>> >-*.ns_deps
>> > *.o
>> > *.o.*
>> > *.patch
>> >@@ -61,6 +60,7 @@ modules.order
>> > /System.map
>> > /Module.markers
>> > /modules.builtin.modinfo
>> >+/modules.nsdeps
>> >
>> > #
>> > # RPM spec file (make rpm-pkg)
>> >diff --git a/Documentation/dontdiff b/Documentation/dontdiff
>> >index 9f4392876099..72fc2e9e2b63 100644
>> >--- a/Documentation/dontdiff
>> >+++ b/Documentation/dontdiff
>> >@@ -179,6 +179,7 @@ mkutf8data
>> > modpost
>> > modules.builtin
>> > modules.builtin.modinfo
>> >+modules.nsdeps
>> > modules.order
>> > modversions.h*
>> > nconf
>> >diff --git a/Makefile b/Makefile
>> >index 0ef897fd9cfd..1e3f307bd49b 100644
>> >--- a/Makefile
>> >+++ b/Makefile
>> >@@ -1356,7 +1356,7 @@ endif # CONFIG_MODULES
>> >
>> > # Directories & files removed with 'make clean'
>> > CLEAN_DIRS += include/ksym
>> >-CLEAN_FILES += modules.builtin.modinfo
>> >+CLEAN_FILES += modules.builtin.modinfo modules.nsdeps
>>
>> Hmm, I tried to run `make -C path/to/kernel/src M=$(PWD) clean` for a test
>> external module, but it didn't remove modules.nsdeps for me. I declared a
>> MODULE namespace for testing purposes.
>>
>> $ make
>> make -C /dev/shm/linux M=/tmp/ppyu/test-module
>> make[1]: Entering directory '/dev/shm/linux'
>> AR /tmp/ppyu/test-module/built-in.a
>> CC [M] /tmp/ppyu/test-module/test1.o
>> CC [M] /tmp/ppyu/test-module/test2.o
>> LD [M] /tmp/ppyu/test-module/test.o
>> Building modules, stage 2.
>> MODPOST 1 modules
>> WARNING: module test uses symbol try_module_get from namespace MODULE, but does not import it.
>> CC [M] /tmp/ppyu/test-module/test.mod.o
>> LD [M] /tmp/ppyu/test-module/test.ko
>> make[1]: Leaving directory '/dev/shm/linux'
>>
>> Then I make nsdeps:
>>
>> make -C /dev/shm/linux M=/tmp/ppyu/test-module nsdeps
>> make[1]: Entering directory '/dev/shm/linux'
>> Building modules, stage 2.
>> MODPOST 1 modules
>> WARNING: module test uses symbol try_module_get from namespace MODULE, but does not import it.
>> Adding namespace MODULE to module /tmp/ppyu/test-module/test.ko.
>> --- /tmp/ppyu/test-module/test1.c
>> +++ /tmp/cocci-output-3696-c1f8b3-test1.c
>> @@ -38,3 +38,4 @@ static void __exit hello_cleanup(void)
>> module_init(hello_init);
>> module_exit(hello_cleanup);
>> MODULE_LICENSE("GPL");
>> +MODULE_IMPORT_NS(MODULE);
>> make[1]: Leaving directory '/dev/shm/linux'
>> $ cat modules.nsdeps
>> /tmp/ppyu/test-module/test.ko: MODULE
>>
>> Looks good so far, then I try make clean:
>>
>> $ make clean
>> make -C /dev/shm/linux M=/tmp/ppyu/test-module clean
>> make[1]: Entering directory '/dev/shm/linux'
>> CLEAN /tmp/ppyu/test-module/Module.symvers
>> make[1]: Leaving directory '/dev/shm/linux'
>> $ ls
>> Makefile modules.nsdeps test1.c test2.c
>>
>> But modules.nsdeps is still there.
>>
>
>Good catch!
>
>I forgot to take care of it for external module builds.
>
>The following should work. I will fold it in 3/4.
>
>
>
>
>diff --git a/Makefile b/Makefile
>index 79be70bf2899..6035702803eb 100644
>--- a/Makefile
>+++ b/Makefile
>@@ -1619,7 +1619,7 @@ _emodinst_post: _emodinst_
> $(call cmd,depmod)
>
> clean-dirs := $(KBUILD_EXTMOD)
>-clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers
>+clean: rm-files := $(KBUILD_EXTMOD)/Module.symvers $(KBUILD_EXTMOD)/modules.nsdeps

Reviewed-by: Matthias Maennich <[email protected]>
Tested-by: Matthias Maennich <[email protected]>

Thanks for this improvement!

Cheers,
Matthias

>
> PHONY += /
> /:
>
>
>
>--
>Best Regards
>Masahiro Yamada