Re: start_kernel(): bug: interrupts were enabled early

From: Benjamin Herrenschmidt
Date: Thu Apr 01 2010 - 03:50:54 EST

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 ?


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