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

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Date:	Thu, 01 Apr 2010 17:50:23 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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 23:26 -0700, H. Peter Anvin wrote:
> On 03/31/2010 03:26 PM, Andrew Morton wrote:
> > 
> > Not by adding overhead to every single down_read()/down_write() just to
> > fix a once-off startup problem - that's taking laziness way too far.
> > 
> 
> How much overhead is this on non-x86 architectures (keep in mind x86
> doesn't use this?)

None on powerpc, we use atomic ops and don't disable IRQs.

BTW. The same problem used to happen with mutex debug. Was this ever
fixed ?

Cheers,
Ben.


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