ANDROID: initramfs: Add skip_initramfs command line option

Add a skip_initramfs option to allow choosing whether to boot using the initramfs or not at runtime. Change-Id: If30428fa748c1d4d3d7b9d97c1f781de5e4558c3 Signed-off-by: Rom Lemarchand <romlem@google.com>
sailfish-oneplus6 · Jan 27, 2017 · c3c2e99 · c3c2e99
1 parent 9a4a740
commit c3c2e99
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Showing 4 changed files with 58 additions and 5 deletions.
diff --git a/include/linux/initramfs.h b/include/linux/initramfs.h
@@ -0,0 +1,32 @@
+/*
+ * include/linux/initramfs.h
+ *
+ * Copyright (C) 2015, Google
+ * Rom Lemarchand <romlem@android.com>
+ *
+ * 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
+ */
+
+#ifndef _LINUX_INITRAMFS_H
+#define _LINUX_INITRAMFS_H
+
+#include <linux/kconfig.h>
+
+#if IS_BUILTIN(CONFIG_BLK_DEV_INITRD)
+
+int __init default_rootfs(void);
+
+#endif
+
+#endif /* _LINUX_INITRAMFS_H */
diff --git a/init/Makefile b/init/Makefile
@@ -5,11 +5,8 @@
 ccflags-y := -fno-function-sections -fno-data-sections
 
 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
 
 ifneq ($(CONFIG_ARCH_INIT_TASK),y)

diff --git a/init/initramfs.c b/init/initramfs.c
@@ -18,6 +18,7 @@
 #include <linux/dirent.h>
 #include <linux/syscalls.h>
 #include <linux/utime.h>
+#include <linux/initramfs.h>
 
 static ssize_t __init xwrite(int fd, const char *p, size_t count)
 {
@@ -605,9 +606,25 @@ static void __init clean_rootfs(void)
 }
 #endif
 
+static int __initdata do_skip_initramfs;
+
+static int __init skip_initramfs_param(char *str)
+{
+	if (*str)
+		return 0;
+	do_skip_initramfs = 1;
+	return 1;
+}
+__setup("skip_initramfs", skip_initramfs_param);
+
 static int __init populate_rootfs(void)
 {
-	char *err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
+	char *err;
+
+	if (do_skip_initramfs)
+		return default_rootfs();
+
+	err = unpack_to_rootfs(__initramfs_start, __initramfs_size);
 	if (err)
 		panic("%s", err); /* Failed to decompress INTERNAL initramfs */
 	if (initrd_start) {

diff --git a/init/noinitramfs.c b/init/noinitramfs.c
@@ -21,11 +21,16 @@
 #include <linux/stat.h>
 #include <linux/kdev_t.h>
 #include <linux/syscalls.h>
+#include <linux/kconfig.h>
+#include <linux/initramfs.h>
 
 /*
  * Create a simple rootfs that is similar to the default initramfs
  */
-static int __init default_rootfs(void)
+#if !IS_BUILTIN(CONFIG_BLK_DEV_INITRD)
+static
+#endif
+int __init default_rootfs(void)
 {
 	int err;
 
@@ -49,4 +54,6 @@ static int __init default_rootfs(void)
 	printk(KERN_WARNING "Failed to create a rootfs\n");
 	return err;
 }
+#if !IS_BUILTIN(CONFIG_BLK_DEV_INITRD)
 rootfs_initcall(default_rootfs);
+#endif