linux-kernel - Re: [patch] pipe: Don't oops when pipe filesystem isn't mounted

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Message-ID: <20061211100301.GD4587@ftp.linux.org.uk>
Date:	Mon, 11 Dec 2006 10:03:01 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Andrew Morton <akpm@...l.org>
Cc:	Andrew MChuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"Linus Torvalds orton <akpm@...l.org>" <torvalds@...l.org>
Subject: Re: [patch] pipe: Don't oops when pipe filesystem isn't mounted

On Mon, Dec 11, 2006 at 01:47:27AM -0800, Andrew Morton wrote:
> - populate_rootfs() puts stuff into the filesystem
> 
> - we then run initcalls.
> 
> - an initcall runs /sbin/hotplug.
> 
> We're now running userspace before all the initcalls have been executed. 
> Hence we're trying to run userspace when potentially none of "grep
> _initcall */*.c" has been executed.  It isn't a kernel yet...

That's... arguable.  We certainly don't need lots and lots of initcalls
to be able to run userland code.  Which ones are missing in your opinion?

As for that example, I'd love to see specifics - which driver triggers
hotplug?  Presumably it happens from an initcall, so we also have something
fishy here...

Said that, I think that pipes should be initialized early.
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