Commit ac031f26 authored by Theodore Ts'o's avatar Theodore Ts'o Committed by Sam Ravnborg
Browse files

kbuild: add option for stripping modules while installing them 



Add option for stripping modules while installing them.

This function adds support for stripping modules while they are being
installed.  CONFIG_DEBUG_KERNEL (which will probably become more
popular as developers use kdump) causes the size of the installed
modules to grow by a factor of 9 or so.

Some kernel package systems solve this problem by stripping the debug
information from /lib/modules after running "make modules_install",
but that may not work for people who are installing directly into
/lib/modules --- root partitions that were sized to handle 16 megs
worth of modules may not be quite so happy with 145 megs of modules,
so the "make modules_install" never succeeds.

This patch allows such users to request modules_install to strip the
modules as they are installed.

Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: default avatarSam Ravnborg <sam@ravnborg.org>
parent 468d9494

Documentation/kbuild/makefiles.txt

+8 −0
Original line number Diff line number Diff line
@@ -1123,6 +1123,14 @@ The top Makefile exports the following variables: 
	$(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE).  The user may

	override this value on the command line if desired.



    INSTALL_MOD_STRIP



	If this variable is specified, will cause modules to be stripped

	after they are installed.  If INSTALL_MOD_STRIP is '1', then the

	default option --strip-debug will be used.  Otherwise,

	INSTALL_MOD_STRIP will used as the option(s) to the strip command.





=== 8 Makefile language



The kernel Makefiles are designed to run with GNU Make.  The Makefiles

Makefile

+17 −0
Original line number Diff line number Diff line
@@ -512,6 +512,23 @@ export INSTALL_PATH ?= /boot 
MODLIB	= $(INSTALL_MOD_PATH)/lib/modules/$(KERNELRELEASE)

export MODLIB



#

#  INSTALL_MOD_STRIP, if defined, will cause modules to be

#  stripped after they are installed.  If INSTALL_MOD_STRIP is '1', then

#  the default option --strip-debug will be used.  Otherwise,

#  INSTALL_MOD_STRIP will used as the options to the strip command.



ifdef INSTALL_MOD_STRIP

ifeq ($(INSTALL_MOD_STRIP),1)

mod_strip_cmd = $STRIP) --strip-debug

else

mod_strip_cmd = $(STRIP) $(INSTALL_MOD_STRIP)

endif # INSTALL_MOD_STRIP=1

else

mod_strip_cmd = true

endif # INSTALL_MOD_STRIP

export mod_strip_cmd





ifeq ($(KBUILD_EXTMOD),)

core-y		+= kernel/ mm/ fs/ ipc/ security/ crypto/ block/

scripts/Makefile.modinst

+1 −1
Original line number Diff line number Diff line
@@ -17,7 +17,7 @@ __modinst: $(modules) 
	@:



quiet_cmd_modules_install = INSTALL $@

      cmd_modules_install = mkdir -p $(2); cp $@ $(2)

      cmd_modules_install = mkdir -p $(2); cp $@ $(2) ; $(mod_strip_cmd) $(2)/$(notdir $@)



# Modules built outside the kernel source tree go into extra by default

INSTALL_MOD_DIR ?= extra

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