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localmodconfig: Document localmodconfig in README

Someone (over a year ago :-p) asked me to document localmodconfig in the
README file in the source code.  I thought it was a good idea but other
things were more important and I simply forgot about it.  Well, I
stumbled on the email asking me about this and I'm sending it out now.

Signed-off-by: Steven "Mr. Procrastinator" Rostedt <>
Signed-off-by: Linus Torvalds <>
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rostedt authored and torvalds committed Oct 5, 2012
1 parent d8dc91b commit 80b810b276cf89587cdaa103e39027813b1be46c
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  1. +18 −0 README
@@ -206,6 +206,24 @@ CONFIGURING the kernel:
"make randconfig" Create a ./.config file by setting symbol
values to random values.
+ "make localmodconfig" Create a config based on current config and
+ loaded modules (lsmod). Disables any module
+ option that is not needed for the loaded modules.
+ To create a localmodconfig for another machine,
+ store the lsmod of that machine into a file
+ and pass it in as a LSMOD parameter.
+ target$ lsmod > /tmp/mylsmod
+ target$ scp /tmp/mylsmod host:/tmp
+ host$ make LSMOD=/tmp/mylsmod 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.
You can find more information on using the Linux kernel config tools
in Documentation/kbuild/kconfig.txt.

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