On Wed, May 13, 2020 at 12:36 AM 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 LMC_KEEP="drivers/usb:fs" localmodconfig
>
> Signed-off-by: Changbin Du <changbin.du@xxxxxxxxx>
> Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
>
Applied to linux-kbuild.
Thanks.
> ---
> v6: add note for localyesconfig.
> v5: use ':' as delimiter.
> v4: fix typo.
> v3: rename LOCALMODCONFIG_PRESERVE to shorter LMC_KEEP.
> v2: fix typo in documentation. (Randy Dunlap)
> ---
> Documentation/admin-guide/README.rst | 11 +++++++++--
> scripts/kconfig/Makefile | 2 ++
> scripts/kconfig/streamline_config.pl | 21 +++++++++++++++++++++
> 3 files changed, 32 insertions(+), 2 deletions(-)
>
> diff --git a/Documentation/admin-guide/README.rst b/Documentation/admin-guide/README.rst
> index cc6151fc0845..5fb526900023 100644
> --- a/Documentation/admin-guide/README.rst
> +++ b/Documentation/admin-guide/README.rst
> @@ -209,15 +209,22 @@ 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 certain folders
> + or kconfig files by specifying their paths in
> + parameter LMC_KEEP.
> +
> target$ lsmod > /tmp/mylsmod
> target$ scp /tmp/mylsmod host:/tmp
>
> - host$ make LSMOD=/tmp/mylsmod localmodconfig
> + host$ make LSMOD=/tmp/mylsmod \
> + LMC_KEEP="drivers/usb:drivers/gpu:fs" \
> + localmodconfig
>
> The above also works when cross compiling.
>
> "make localyesconfig" Similar to localmodconfig, except it will convert
> - all module options to built in (=y) options.
> + all module options to built in (=y) options. You can
> + also preserve modules by LMC_KEEP.
>
> "make kvmconfig" Enable additional options for kvm guest kernel support.
>
> diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> index c9d0a4a8efb3..f3355bd86aa5 100644
> --- a/scripts/kconfig/Makefile
> +++ b/scripts/kconfig/Makefile
> @@ -123,7 +123,9 @@ help:
> @echo ' gconfig - Update current config utilising a GTK+ based front-end'
> @echo ' oldconfig - Update current config utilising a provided .config as base'
> @echo ' localmodconfig - Update current config disabling modules not loaded'
> + @echo ' except those preserved by LMC_KEEP environment variable'
> @echo ' localyesconfig - Update current config converting local mods to core'
> + @echo ' except those preserved by LMC_KEEP environment variable'
> @echo ' defconfig - New config with default from ARCH supplied defconfig'
> @echo ' savedefconfig - Save current config as ./defconfig (minimal config)'
> @echo ' allnoconfig - New config where all options are answered with no'
> diff --git a/scripts/kconfig/streamline_config.pl b/scripts/kconfig/streamline_config.pl
> index e2f8504f5a2d..19857d18d814 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; $i++) {
> @@ -591,6 +593,20 @@ while ($repeat) {
> }
>
> my %setconfigs;
> +my @preserved_kconfigs = split(/:/,$ENV{LMC_KEEP});
> +
> +sub in_preserved_kconfigs {
> + my $kconfig = $config2kfile{$_[0]};
> + if (!defined($kconfig)) {
> + return 0;
> + }
> + foreach my $excl (@preserved_kconfigs) {
> + if($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.
> @@ -644,6 +660,11 @@ foreach my $line (@config_file) {
> }
>
> if (/^(CONFIG.*)=(m|y)/) {
> + if (in_preserved_kconfigs($1)) {
> + dprint "Preserve config $1";
> + print;
> + next;
> + }
> if (defined($configs{$1})) {
> if ($localyesconfig) {
> $setconfigs{$1} = 'y';
> --
> 2.25.1
>
--
Best Regards
Masahiro Yamada
