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

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Date:   Tue, 29 Oct 2019 21:57:26 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Jessica Yu <jeyu@...nel.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matthias Maennich <maennich@...gle.com>
Subject: Re: [PATCH 4/4] scripts/nsdeps: make sure to pass all module source
 files to spatch

On Tue, Oct 29, 2019 at 12:14 AM Jessica Yu <jeyu@...nel.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 $2.
>
> Signed-off-by: Jessica Yu <jeyu@...nel.org>
> ---
>  scripts/nsdeps | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/scripts/nsdeps b/scripts/nsdeps
> index 9ddcd5cb96b1..5055b059a81b 100644
> --- a/scripts/nsdeps
> +++ b/scripts/nsdeps
> @@ -36,7 +36,7 @@ generate_deps() {
>                                               | sed -E "s%(^|\s)([^/][^ ]*)%\1$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



-- 
Best Regards
Masahiro Yamada