On Thu, 7 May 2020 12:19:57 +0900
Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote:
> On Sun, May 3, 2020 at 9:11 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>
> >
> > ---
> > v4: fix typo.
> > v3: rename LOCALMODCONFIG_PRESERVE to shorter LMC_KEEP.
> > v2: fix typo in documentation. (Randy Dunlap)
> > ---
>
>
> Personally, I do not mind the long LOCALMODCONFIG_PRESERVE,
Perhasp we allow both? ;-)
And just have one set to the other.
> but this tends to be bike-sheding.
> I do not have a strong opinion.
>
>
> > Documentation/admin-guide/README.rst | 8 +++++++-
> > scripts/kconfig/Makefile | 1 +
> > scripts/kconfig/streamline_config.pl | 23 +++++++++++++++++++++++
> > 3 files changed, 31 insertions(+), 1 deletion(-)
> >
> > diff --git a/Documentation/admin-guide/README.rst b/Documentation/admin-guide/README.rst
> > index cc6151fc0845..1371deab8bc7 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 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" \
>
>
> This might be another bike-sheding item, but
> can you use a space for the delimiter?
>
>
> LMC_KEEP="drivers/usb drivers/gpu fs"
>
> If you pass multiple directories,
> you will need to surround them with double-quotes.
I agree that spaces look better.
>
>
>
>
> > + localmodconfig
> >
> > The above also works when cross compiling.
> >
> > diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
> > index c9d0a4a8efb3..e0abbf5805f5 100644
> > --- a/scripts/kconfig/Makefile
> > +++ b/scripts/kconfig/Makefile
> > @@ -123,6 +123,7 @@ 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 ' defconfig - New config with default from ARCH supplied defconfig'
> > @echo ' savedefconfig - Save current config as ./defconfig (minimal config)'
> > diff --git a/scripts/kconfig/streamline_config.pl b/scripts/kconfig/streamline_config.pl
> > index e2f8504f5a2d..d26543a807c9 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 @preserved_kconfigs;
> > +@preserved_kconfigs = split(/;/,$ENV{LMC_KEEP}) if (defined($ENV{LMC_KEEP}));
>
> Maybe, you can do 'my' declaration and the assignment
> in a single line?
>
> Can you drop the 'if ...' conditional?
>
>
> Does this work for you?
>
> my @preserved_kconfigs = split(/;/,$ENV{LMC_KEEP});
>
>
Will an undefined warning happen if LMC_KEEP isn't defined?
-- Steve
