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authorJean-Paul Saman <jean-paul.saman@nxp.com>2007-02-10 01:44:43 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:25 -0800
commitc33df4eaaf41fd3e34837a6ae9a5f9970c393d9f (patch)
treeb53498e6cd10a6da004b1835f285ed64493abdf2 /init/Makefile
parentdd65aa6690e30fdad84a62191c7ab37da89d9865 (diff)
downloadlinux-linaro-stable-c33df4eaaf41fd3e34837a6ae9a5f9970c393d9f.tar.gz
[PATCH] disable init/initramfs.c
The file init/initramfs.c is always compiled and linked in the kernel vmlinux even when BLK_DEV_RAM and BLK_DEV_INITRD are disabled and the system isn't using any form of an initramfs or initrd. In this situation the code is only used to unpack a (static) default initial rootfilesystem. The current init/initramfs.c code. usr/initramfs_data.o compiles to a size of ~15 kbytes. Disabling BLK_DEV_RAM and BLK_DEV_INTRD shrinks the kernel code size with ~60 Kbytes. This patch avoids compiling in the code and data for initramfs support if CONFIG_BLK_DEV_INITRD is not defined. Instead of the initramfs code and data it uses a small routine in init/noinitramfs.c to setup an initial static default environment for mounting a rootfilesystem later on in the kernel initialisation process. The new code is: 164 bytes of size. The patch is separated in two parts: 1) doesn't compile initramfs code when CONFIG_BLK_DEV_INITRD is not set 2) changing all plaforms vmlinux.lds.S files to not reserve an area of PAGE_SIZE when CONFIG_BLK_DEV_INITRD is not set. [deweerdt@free.fr: warning fix] Signed-off-by: Jean-Paul Saman <jean-paul.saman@nxp.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: <linux-arch@vger.kernel.org> Signed-off-by: Frederik Deweerdt <frederik.deweerdt@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'init/Makefile')
-rw-r--r--init/Makefile7
1 files changed, 6 insertions, 1 deletions
diff --git a/init/Makefile b/init/Makefile
index 633a268d270d..0154aea1e52d 100644
--- a/init/Makefile
+++ b/init/Makefile
@@ -2,7 +2,12 @@
# Makefile for the linux kernel.
#
-obj-y := main.o version.o mounts.o initramfs.o
+obj-y := main.o version.o mounts.o
+ifneq ($(CONFIG_BLK_DEV_INITRD),y)
+obj-y += noinitramfs.o
+else
+obj-$(CONFIG_BLK_DEV_INITRD) += initramfs.o
+endif
obj-$(CONFIG_GENERIC_CALIBRATE_DELAY) += calibrate.o
mounts-y := do_mounts.o