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

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Message-ID: <1270084631.7101.81.camel@pasglop>
Date:	Thu, 01 Apr 2010 12:17:11 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Matthew Wilcox <matthew@....cx>,
	Yinghai Lu <yinghai@...nel.org>, Rabin Vincent <rabin@....in>,
	lkml <linux-kernel@...r.kernel.org>, penberg@...helsinki.fi,
	linux-arch@...r.kernel.org
Subject: Re: start_kernel(): bug: interrupts were enabled early

On Wed, 2010-03-31 at 15:49 -0700, Andrew Morton wrote:
> 
> But these things are all utterly gross.  The bottom line is that
> radix_tree_init() is manifestly unsuited to being called with local
> interrupts disabled.  773e3eb7b81e5ba13b5155dfb3bb75b8ce37f8f9 was
> just a wrong patch. 

Except that powerpc (and now it seems x86) both want to use radix trees
for interrupt handling... At least on powerpc, we trick and use a linear
search until the radix trees are initialized, which we do later during
boot, but that somewhat sucks.

I believe sherry picking things like not calling radix_tree_init() is
going to fix one case today, until we have another one, and another one,
and etc...

I suspect we're better off fixing the root of the problem in down/up.

Cheers,
Ben.

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