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>
---
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
