2.1.97 SMP+UP works suddenly..+fpu_memcpy doesn't

Michael L. Galbraith (mikeg@weiden.de)
Wed, 22 Apr 1998 07:54:49 +0200 (MET DST)


Hello SMP folks,

My UP machine has been SMP dead since early 2.1. I periodically fire
it up and pick at it for a while.. eventually get dizzy and give up.

Fired up 2.1.97, and it worked! Enabling fpu_memcpy kills it tho..
the last thing to printk being 'Starting kswapd v 1.5'.

Thinking 'hmm.. what is different when fpu_memcpy is in play?', I can
only come up with one thing; the exception (device_not_available) which
happens upon first use of the FPU after a context switch.

This indicates that someone is doing a copy or clear with interrupts
dissabled.. yes? Is this worth chasing or is it a case of don't use
fpu_memcpy with SMP?

-Mike

Broom.. check
Dustpan.. check
...
Bic disposable fs.. check

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