Re: [PATCH 4/4] scripts/nsdeps: make sure to pass all module source files to spatch

Masahiro Yamada
2019-10-31T12:28:00Z

On Thu, Oct 31, 2019 at 1:17 AM Jessica Yu <jeyu@kernel.org> wrote:
>
> +++ Masahiro Yamada [29/10/19 21:57 +0900]:
> >On Tue, Oct 29, 2019 at 12:14 AM Jessica Yu <jeyu@kernel.org> wrote:
> >>
> >> The nsdeps script passes a list of the module source files to
> >> generate_deps_for_ns() as a space delimited string named $mod_source_files,
> >> which then passes it to spatch. But since $mod_source_files is not encased
> >> in quotes, each source file in that string is treated as a separate shell
> >> function argument (as $2, $3, $4, etc.). However, the spatch invocation
> >> only refers to $2, so only the first file out of $mod_source_files is
> >> processed by spatch.
> >>
> >> This causes problems (namely, the MODULE_IMPORT_NS() statement doesn't
> >> get inserted) when a module is composed of many source files and the
> >> "main" module file containing the MODULE_LICENSE() statement is not the
> >> first file listed in $mod_source_files. Fix this by encasing
> >> $mod_source_files in quotes so that the entirety of the string is
> >> treated as a single argument and can be referred to as $2.
> >>
> >> Signed-off-by: Jessica Yu <jeyu@kernel.org>
> >> ---
> >> scripts/nsdeps | 2 +-
> >> 1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/scripts/nsdeps b/scripts/nsdeps
> >> index 9ddcd5cb96b1..5055b059a81b 100644
> >> --- a/scripts/nsdeps
> >> +++ b/scripts/nsdeps
> >> @@ -36,7 +36,7 @@ generate_deps() {
> >> | sed -E "s%(^|\s)([^/][^ ]*)%\1$srctree/\2%g"`
> >> for ns in `cat $ns_deps_file`; do
> >> echo "Adding namespace $ns to module $mod_name (if needed)."
> >> - generate_deps_for_ns $ns $mod_source_files
> >> + generate_deps_for_ns $ns "$mod_source_files"
> >> # sort the imports
> >> for source_file in $mod_source_files; do
> >> sed '/MODULE_IMPORT_NS/Q' $source_file > ${source_file}.tmp
> >
> >I think this change is correct, but
> >did you succeed in nsdeps for composite modules
> >with this patch only?
> >
> >I think the following is needed too:
> >
> >
> >diff --git a/scripts/nsdeps b/scripts/nsdeps
> >index dda6fbac016e..5a23ea616446 100644
> >--- a/scripts/nsdeps
> >+++ b/scripts/nsdeps
> >@@ -31,9 +31,9 @@ generate_deps() {
> > 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_source_files="`cat $mod_file | sed -n 1p
> > \
> > | sed -e 's/\.o/\.c/g' \
> >- | sed "s|[^ ]* *|${srctree}/&|g"`
> >+ | sed "s|[^ ]* *|${srctree}/&|g"`"
> > for ns in `cat $ns_deps_file`; do
> > echo "Adding namespace $ns to module $mod_name (if needed)."
> > generate_deps_for_ns $ns $mod_source_files
> >
> >
> >Without this, a module that consists of two files
> >will be expanded to:
> >
> >local mod_source_files=source1.c source2.c
>
> Yes, I was able to have nsdeps work for composite modules with just my
> patch. Without this patch applied, the script produces the following
> expansion of the generate_deps_for_ns call, (I just added a test
> namespace MODULE):
>
> Adding namespace MODULE to module fs/nfs/nfs.ko.
> + generate_deps_for_ns MODULE /tmp/ppyu/linux/fs/nfs/client.c /tmp/ppyu/linux/fs/nfs/dir.c /tmp/ppyu/linux/fs/nfs/file.c /tmp/ppyu/linux/fs/nfs/getroot.c /tmp/ppyu/linux/fs/nfs/inode.c /tmp/ppyu/linux/fs/nfs/super.c /tmp/ppyu/linux/fs/nfs/io.c /tmp/ppyu/linux/fs/nfs/direct.c /tmp/ppyu/linux/fs/nfs/pagelist.c /tmp/ppyu/linux/fs/nfs/read.c /tmp/ppyu/linux/fs/nfs/symlink.c /tmp/ppyu/linux/fs/nfs/unlink.c /tmp/ppyu/linux/fs/nfs/write.c /tmp/ppyu/linux/fs/nfs/namespace.c /tmp/ppyu/linux/fs/nfs/mount_clnt.c /tmp/ppyu/linux/fs/nfs/nfstrace.c /tmp/ppyu/linux/fs/nfs/export.c /tmp/ppyu/linux/fs/nfs/sysfs.c /tmp/ppyu/linux/fs/nfs/sysctl.c /tmp/ppyu/linux/fs/nfs/fscache.c /tmp/ppyu/linux/fs/nfs/fscache-index.c
> + /usr/bin/spatch --very-quiet --in-place --sp-file /tmp/ppyu/linux/scripts/coccinelle/misc/add_namespace.cocci -D ns=MODULE /tmp/ppyu/linux/fs/nfs/client.c
>
> So only the first file got included in the spatch invocation. But the
> spatch call gets fixed with all the files when quotes are added in the
> call to generate_deps_for_ns.
>
> But we need to include your change anyway, to make the script more
> robust.

Hmm.
With this patch only, I see "bad variable name" error.

masahiro@grover:~/ref/linux$ make -j8 nsdeps
DESCEND objtool
CALL scripts/atomic/check-atomics.sh
CALL scripts/checksyscalls.sh
CHK include/generated/compile.h
Building modules, stage 2.
MODPOST 20 modules
WARNING: module nfs uses symbol foo from namespace USB_STORAGE, but
does not import it.
Building modules, stage 2.
MODPOST 20 modules
./scripts/nsdeps: 34: local: ./fs/nfs/dir.c: bad variable name
make: *** [Makefile;1689: nsdeps] Error 2

> It would probably prevent more shell script related bugs in
> the future (Like [1]). I can respin this patch only while the other
> ones are superceded by your patchset.
>
> [1] https://unix.stackexchange.com/a/131767

Anyway.

Is this patch aiming for v5.4 (i.e. fixes) or v5.5-rc1 ?

If you touch the mod_source_files line,
we will have a conflict because
https://patchwork.kernel.org/patch/11217839/
is touching the same line.

How should we organize the patch order?