linux-kernel - No /dev/root with devtmpfs?

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Message-ID: <20120206111853.GA11506@tugrik.mns.mnsspb.ru>
Date:	Mon, 6 Feb 2012 15:18:53 +0400
From:	Kirill Smelkov <kirr@....spb.ru>
To:	linux-kernel@...r.kernel.org
Cc:	Kay Sievers <kay.sievers@...y.org>
Subject: No /dev/root with devtmpfs?

Hello up there.

Recently I've reworked my system not to use udev, but use devtmpfs
instead and discovered there is no /dev/root symlink in devtmpfs case.

My setup uses /dev/root early to know what is the boot device and then
do some operations on it like checksumming, etc...

Now when /dev/root is gone the best workaround I could come up with is
to   grep /proc/partitions for '[hs]d[a-z]1'  but it's ugly and will
break when there are several block devices attached.

Is it somehow possible to add /dev/root to devtmpfs?

Thanks,
Kirill
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