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

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Date:	Mon, 11 Dec 2006 16:12:12 +0000
From:	Al Viro <viro@....linux.org.uk>
To:	Linus Torvalds <torvalds@...l.org>
Cc:	Andrew Morton <akpm@...l.org>,
	Andrew MChuck Ebbert <76306.1226@...puserve.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch] pipe: Don't oops when pipe filesystem isn't mounted

On Mon, Dec 11, 2006 at 08:01:40AM -0800, Linus Torvalds wrote:
> 
> 
> On Mon, 11 Dec 2006, Al Viro wrote:
> 
> > On Mon, Dec 11, 2006 at 02:27:46AM -0800, Andrew Morton wrote:
> > > @@ -115,6 +115,11 @@ extern void setup_arch(char **);
> > >  #define device_initcall_sync(fn)	__define_initcall("6s",fn,6s)
> > >  #define late_initcall(fn)		__define_initcall("7",fn,7)
> > >  #define late_initcall_sync(fn)		__define_initcall("7s",fn,7s)
> > > +#define populate_rootfs_initcall(fn)	__define_initcall("8",fn,8)
> > > +#define populate_rootfs_initcall_sync(fn) __define_initcall("8s",fn,8s)
> > > +#define rootfs_neeeded_initcall(fn)	__define_initcall("9",fn,9)
> > > +#define rootfs_neeeded_initcall_sync(fn) __define_initcall("9s",fn,9s)
> > 
> > Ewww....  After module_init()?  Please, don't.  Come on, if it can
> > be a module, it _must_ be ready to run late in the game.
> 
> Yeah, I think you should just run "populate_rootfs()" just before 
> "module_init" (which is the same as "device_initcall()").

> If any really core stuff needs user-land - tough titties, as they say.

FWIW, I really think that this sort of bugs ("oh, I call hotplug,
rootfs is there but kernel is not ready, woe is me") clearly show
that many, _many_ users of hotplug are BS.  The reason is simple -
if we have a call of hotplug that early, we have a driver that lives
with hotplug failures _and_ with different behaviour in built-in
and modular cases.  I would argue that any such driver is broken.
-
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