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streamline_config.pl: add LMC_KEEP to preserve some kconfigs

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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@gmail.com>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Changbin Du 2020-05-12 23:36:07 +08:00 committed by Masahiro Yamada
parent 09d5873e4d
commit c027b02d89
3 changed files with 32 additions and 2 deletions
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11
Documentation/admin-guide/README.rst
View File

@ -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.

2
scripts/kconfig/Makefile
View File

@ -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'

21
scripts/kconfig/streamline_config.pl
View File

@ -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';