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Subject[PATCH, RFC] Add option for stripping modules while installing them
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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: "Theodore Ts'o" <tytso@mit.edu>


Index: linux-2.6/Makefile
===================================================================
--- linux-2.6.orig/Makefile 2006-04-28 21:16:50.000000000 -0400
+++ linux-2.6/Makefile 2006-05-21 19:01:06.000000000 -0400
@@ -518,6 +518,23 @@
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/
Index: linux-2.6/scripts/Makefile.modinst
===================================================================
--- linux-2.6.orig/scripts/Makefile.modinst 2006-03-25 21:26:41.000000000 -0500
+++ linux-2.6/scripts/Makefile.modinst 2006-05-21 19:01:06.000000000 -0400
@@ -17,7 +17,7 @@
@:

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
Index: linux-2.6/Documentation/kbuild/makefiles.txt
===================================================================
--- linux-2.6.orig/Documentation/kbuild/makefiles.txt 2006-03-25 21:26:07.000000000 -0500
+++ linux-2.6/Documentation/kbuild/makefiles.txt 2006-05-21 19:01:07.000000000 -0400
@@ -1123,6 +1123,14 @@
$(INSTALL_MOD_PATH)/lib/modules/$(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
-
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