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'"?
>
> 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
