[PATCH] allow /proc/config.gz to be built as a module

The driver for /proc/config.gz consumes rather a lot of memory and it is in
fact possible to build it as a module.

In some ways this is a bit risky, because the .config which is used for
compiling kernel/configs.c isn't necessarily the same as the .config which was
used to build vmlinux.

But OTOH the potential memory savings are decent, and it'd be fairly dumb to
build your configs.o with a different .config.

Signed-off-by: Andrew Morton <akpm@google.com>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/init/Kconfig b/init/Kconfig
index d2eb7a84a264f0330d0aab1792f3ac34bbba23b2..899e46eec1b2de3fe5b66a4c9b4e70faa0004f5d 100644 (file)
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -202,7 +202,7 @@ config AUDITSYSCALL
          ensure that INOTIFY is configured.
 
 config IKCONFIG
-       bool "Kernel .config support"
+       tristate "Kernel .config support"
        ---help---
          This option enables the complete Linux kernel ".config" file
          contents to be saved in the kernel. It provides documentation

diff --git a/scripts/Makefile b/scripts/Makefile
index ea41de8fb7f57c09d6ff2297a5ee985077fd695f..1c73c5aea66b06bcecff315356abcecc2a79522f 100644 (file)
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -13,7 +13,7 @@ hostprogs-$(CONFIG_VT)           += conmakehash
 hostprogs-$(CONFIG_PROM_CONSOLE) += conmakehash
 hostprogs-$(CONFIG_IKCONFIG)     += bin2c
 
-always         := $(hostprogs-y)
+always         := $(hostprogs-y) $(hostprogs-m)
 
 # The following hostprogs-y programs are only build on demand
 hostprogs-y += unifdef