Messages in this thread | | | Date | Wed, 31 Mar 2010 23:33:30 -0400 | From | Andrew Morton <> | Subject | Re: start_kernel(): bug: interrupts were enabled early |
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On Wed, 31 Mar 2010 23:26:52 -0700 "H. Peter Anvin" <hpa@zytor.com> 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?) >
Just a few instructions, I guess. But we can do it with zero.
And from a design POV, pretending that down_read()/down_write() can be called with interrupts disabled is daft - they cannot! Why muck up the usual code paths with this startup-specific hack?
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