On Fri, May 01, 2020 at 01:07:29PM -0400, Steven Rostedt wrote:
> On Fri, 1 May 2020 10:37:08 +0800
> Changbin Du <changbin.du@xxxxxxxxx> wrote:
>
> > Sometimes it is useful to preserve batches of configs when making
> > localmodconfig. For example, I usually don't want any usb and fs
> > modules to be disabled. Now we can do it by:
> >
> > $ make LOCALMODCONFIG_PRESERVE="drivers/usb;fs" localmodconfig
>
> That's too much typing ;-) What about just "KEEP='drivers/usb;fs'"?
>
I think we'd better use a long name since it will be passed to the entire kbuild.
And we alreay have one named LOCALMODCONFIG_DEBUG. The prefix LOCALMODCONFIG_
can help to avoid namespace pollution.
>
> >
> > Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx>
> > ---
> > Documentation/admin-guide/README.rst | 8 +++++++-
> > scripts/kconfig/streamline_config.pl | 23 +++++++++++++++++++++++
> > 2 files changed, 30 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/admin-guide/README.rst b/Documentation/admin-guide/README.rst
> > index cc6151fc0845..6deff95362f8 100644
> > --- a/Documentation/admin-guide/README.rst
> > +++ b/Documentation/admin-guide/README.rst
> > @@ -209,10 +209,16 @@ Configuring the kernel
> > store the lsmod of that machine into a file
> > and pass it in as a LSMOD parameter.
> >
> > + Also, you can preserve modules in certen folders
> > + or kconfig files by spcifying there paths in
> > + parameter LOCALMODCONFIG_PRESERVE.
> > +
> > target$ lsmod > /tmp/mylsmod
> > target$ scp /tmp/mylsmod host:/tmp
> >
> > - host$ make LSMOD=/tmp/mylsmod localmodconfig
> > + host$ make LSMOD=/tmp/mylsmod \
> > + LOCALMODCONFIG_PRESERVE="drivers/usb;drivers/gpu;fs" \
> > + localmodconfig
> >
> > The above also works when cross compiling.
> >
> > diff --git a/scripts/kconfig/streamline_config.pl b/scripts/kconfig/streamline_config.pl
> > index e2f8504f5a2d..ab5d1e10a5d0 100755
> > --- a/scripts/kconfig/streamline_config.pl
> > +++ b/scripts/kconfig/streamline_config.pl
> > @@ -143,6 +143,7 @@ my %depends;
> > my %selects;
> > my %prompts;
> > my %objects;
> > +my %config2kfile;
> > my $var;
> > my $iflevel = 0;
> > my @ifdeps;
> > @@ -201,6 +202,7 @@ sub read_kconfig {
> > if (/^\s*(menu)?config\s+(\S+)\s*$/) {
> > $state = "NEW";
> > $config = $2;
> > + $config2kfile{"CONFIG_$config"} = $kconfig;
> >
> > # Add depends for 'if' nesting
> > for (my $i = 0; $i < $iflevel; $i++) {
> > @@ -592,6 +594,22 @@ while ($repeat) {
> >
> > my %setconfigs;
> >
> > +my @presevered_kconfigs;
> > +@presevered_kconfigs = split(/;/,$ENV{LOCALMODCONFIG_PRESERVE}) if (defined($ENV{LOCALMODCONFIG_PRESERVE}));
> > +
> > +sub in_presevered_kconfigs {
> > + my $kconfig = $config2kfile{$_[0]};
> > + if (!defined($kconfig)) {
> > + return 0;
> > + }
> > + foreach my $excl (@presevered_kconfigs) {
> > + if($kconfig =~ /^$excl/) {
> > + return 1;
> > + }
> > + }
> > + return 0;
> > +}
> > +
> > # Finally, read the .config file and turn off any module enabled that
> > # we could not find a reason to keep enabled.
> > foreach my $line (@config_file) {
> > @@ -644,6 +662,11 @@ foreach my $line (@config_file) {
> > }
> >
> > if (/^(CONFIG.*)=(m|y)/) {
> > + if (in_presevered_kconfigs($1)) {
> > + dprint "Preserve config $1";
> > + print;
> > + next;
> > + }
> > if (defined($configs{$1})) {
> > if ($localyesconfig) {
> > $setconfigs{$1} = 'y';
>
> I'll have to test it out, but I like the idea!
>
> -- Steve
--
Cheers,
Changbin Du
