[PATCH 2/2] Starting the population of rootfs early during boot

[Surbhi Palande]

Starting the asynchronous population of rootfs early in
the boot sequence reduces the boot time.

Signed-off-by: Surbhi Palande <surbhi.palande at canonical.com>
---
 include/asm-generic/vmlinux.lds.h |    1 +
 include/linux/init.h              |    1 +
 init/initramfs.c                  |    2 +-
 3 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index b6e818f..d4db519 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -584,6 +584,7 @@
   	*(.initcall0.init)						\
   	*(.initcall0s.init)						\
   	*(.initcall1.init)						\
+	*(.initcallearlyrootfs.init)                                    \
   	*(.initcall1s.init)						\
   	*(.initcall2.init)						\
   	*(.initcall2s.init)						\
diff --git a/include/linux/init.h b/include/linux/init.h
index ff8bde5..39521cf 100644
--- a/include/linux/init.h
+++ b/include/linux/init.h
@@ -185,6 +185,7 @@ extern void (*late_time_init)(void);
 #define pure_initcall(fn)		__define_initcall("0",fn,0)
 
 #define core_initcall(fn)		__define_initcall("1",fn,1)
+#define earlyrootfs_initcall(fn)   __define_initcall("earlyrootfs",fn,rootfs)
 #define core_initcall_sync(fn)		__define_initcall("1s",fn,1s)
 #define postcore_initcall(fn)		__define_initcall("2",fn,2)
 #define postcore_initcall_sync(fn)	__define_initcall("2s",fn,2s)
diff --git a/init/initramfs.c b/init/initramfs.c
index aad2c28..a8f2d2d 100644
--- a/init/initramfs.c
+++ b/init/initramfs.c
@@ -614,4 +614,4 @@ static int __init populate_rootfs(void)
 	async_schedule_domain(async_populate_rootfs, NULL, &rootfs_fn_list);
 }
 
-rootfs_initcall(populate_rootfs);
+earlyrootfs_initcall(populate_rootfs);
-- 
1.6.3.3