linux-kernel - Why get_fs_names return NULL?

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Message-ID: <e997b7420909260219n17fcf421ke2e552e6311c66f6@mail.gmail.com>
Date:	Sat, 26 Sep 2009 17:19:07 +0800
From:	"wilbur.chan" <wilbur512@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Why get_fs_names return NULL?

I am going to start a kernel using ramdisk, but  kernel panic  when
mounting the ramdisk fs.

After traped the code , I found that , when kernel invoked
get_fs_names, it got a NULL list of existing file system names.

That is to say,
prepare_namespace--->mount_root-->mount_block_root-->get_fs_names-->get_filesystem_list
 ,

return  a list of nothing...

I thought that , maybe module_init(init_ext2_fs) failed , but I don't
know why? and how to solve it ?

here is my ramdisk script:

mkdir initrd
dd if=/dev/zero of=initrd.img bs=1k count=4096
mke2fs -F -v -m0 initrd.img
mount -o loop initrd.img initrd
cp -av rootfs/* initrd
sync
umount initrd
sync
gzip -f -9 initrd.img
sync
./mkimage -T ramdisk -C gzip -n ' Ramdisk Image' -d initrd.img.gz
your.ramdisk.u-boot
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