Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=c33df4eaaf41fd3e34837a6ae9a5f9970c393d9f
Commit:     c33df4eaaf41fd3e34837a6ae9a5f9970c393d9f
Parent:     dd65aa6690e30fdad84a62191c7ab37da89d9865
Author:     Jean-Paul Saman <[EMAIL PROTECTED]>
AuthorDate: Sat Feb 10 01:44:43 2007 -0800
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Sun Feb 11 10:51:25 2007 -0800

    [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.
    
    [EMAIL PROTECTED]: warning fix]
    Signed-off-by: Jean-Paul Saman <[EMAIL PROTECTED]>
    Cc: Al Viro <[EMAIL PROTECTED]>
    Cc: <linux-arch@vger.kernel.org>
    Signed-off-by: Frederik Deweerdt <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 drivers/block/Kconfig |    4 ++-
 init/Kconfig          |    4 +++
 init/Makefile         |    7 +++++-
 init/noinitramfs.c    |   52 +++++++++++++++++++++++++++++++++++++++++++++++++
 usr/Makefile          |    2 +-
 5 files changed, 66 insertions(+), 3 deletions(-)

diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index 58c1deb..cacb1c8 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -417,8 +417,10 @@ config BLK_DEV_INITRD
          etc. See <file:Documentation/initrd.txt> for details.
 
          If RAM disk support (BLK_DEV_RAM) is also included, this
-         also enables initial RAM disk (initrd) support.
+         also enables initial RAM disk (initrd) support and adds
+         15 Kbytes (more on some other architectures) to the kernel size.
 
+         If unsure say Y.
 
 config CDROM_PKTCDVD
        tristate "Packet writing on CD/DVD media"
diff --git a/init/Kconfig b/init/Kconfig
index a3f83e2..ab69422 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -280,8 +280,12 @@ config RELAY
 
          If unsure, say N.
 
+if BLK_DEV_INITRD
+
 source "usr/Kconfig"
 
+endif
+
 config CC_OPTIMIZE_FOR_SIZE
        bool "Optimize for size (Look out for broken compilers!)"
        default y
diff --git a/init/Makefile b/init/Makefile
index 633a268..0154aea 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
diff --git a/init/noinitramfs.c b/init/noinitramfs.c
new file mode 100644
index 0000000..f4c1a3a
--- /dev/null
+++ b/init/noinitramfs.c
@@ -0,0 +1,52 @@
+/*
+ * init/noinitramfs.c
+ *
+ * Copyright (C) 2006, NXP Semiconductors, All Rights Reserved
+ * Author: Jean-Paul Saman <[EMAIL PROTECTED]>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+#include <linux/init.h>
+#include <linux/stat.h>
+#include <linux/kdev_t.h>
+#include <linux/syscalls.h>
+
+/*
+ * Create a simple rootfs that is similar to the default initramfs
+ */
+static int __init default_rootfs(void)
+{
+       int err;
+
+       err = sys_mkdir("/dev", 0755);
+       if (err < 0)
+               goto out;
+
+       err = sys_mknod((const char __user *) "/dev/console",
+                       S_IFCHR | S_IRUSR | S_IWUSR,
+                       new_encode_dev(MKDEV(5, 1)));
+       if (err < 0)
+               goto out;
+
+       err = sys_mkdir("/root", 0700);
+       if (err < 0)
+               goto out;
+
+       return 0;
+
+out:
+       printk(KERN_WARNING "Failed to create a rootfs\n");
+       return err;
+}
+rootfs_initcall(default_rootfs);
diff --git a/usr/Makefile b/usr/Makefile
index 382702a..201f27f 100644
--- a/usr/Makefile
+++ b/usr/Makefile
@@ -7,7 +7,7 @@ PHONY += klibcdirs
 
 
 # Generate builtin.o based on initramfs_data.o
-obj-y := initramfs_data.o
+obj-$(CONFIG_BLK_DEV_INITRD) := initramfs_data.o
 
 # initramfs_data.o contains the initramfs_data.cpio.gz image.
 # The image is included using .incbin, a dependency which is not
-
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