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From: "Daniel O'Connor" <doconnor@gsoft.com.au>
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Date: Sun, 9 Jan 2005 16:10:44 +1030
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cc: Peter Jeremy <PeterJeremy@optushome.com.au>
cc: Scott Long <scottl@freebsd.org>
Subject: Re: bus_dmamem_alloc() can't handle large NOWAIT requests
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On Sun, 9 Jan 2005 15:55, Scott Long wrote:
> > bus_dmamem_alloc() maps BUS_DMA_NOWAIT to M_NOWAIT but contigmalloc()
> > does not support M_NOWAIT and will tsleep() under some conditions.
> >
> > Unfortunately, I don't know enough about the VM code to be able to
> > suggest a fix.
>
> Will contigmalloc() actually sleep?  If so, then this is something that
> needs to be addressed in contigmalloc.

Couldn't contigmalloc() just return NULL if it was going to sleep?

(hehe.. "just" ;)

=2D-=20
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C

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