linux-kernel - Re: start_kernel(): bug: interrupts were enabled early

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Message-ID: <20100331210145.GB32165@parisc-linux.org>
Date:	Wed, 31 Mar 2010 15:01:45 -0600
From:	Matthew Wilcox <matthew@....cx>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rabin Vincent <rabin@....in>,
	lkml <linux-kernel@...r.kernel.org>, hpa@...or.com,
	penberg@...helsinki.fi, cl@...ux-foundation.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linux-arch@...r.kernel.org
Subject: Re: start_kernel(): bug: interrupts were enabled early

On Wed, Mar 31, 2010 at 01:47:23PM -0700, Yinghai Lu wrote:
> >> > This appears to be caused by:
> >> > 
> >> >   start_kernel -> radix_tree_init -> kmem_cache_create (slub) ->
> >> >    down_write -> __down_write (lib/rwsem-spinlock.c) -> spin_unlock_irq
> >> > 
> > That's going to be hard to fix.
> > 
> spin_unlock_irq from arm is different from other archs?

Not all arches use lib/rwsem-spinlock.c.  In particular, x86 doesn't
when X86_XADD is set.

-- 
Matthew Wilcox				Intel Open Source Technology Centre
"Bill, look, we understand that you're interested in selling us this
operating system, but compare it to ours.  We can't possibly take such
a retrograde step."
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