Date: Sun, 28 Feb 1999 09:44:56 -0800 (PST) From: John Polstra <jdp@polstra.com> To: castor@geocast.net Cc: stable@freebsd.org Subject: Re: bus_dmamap_load & compiler glitch Message-ID: <199902281744.JAA12017@vashon.polstra.com> In-Reply-To: <Pine.GSO.4.03.9902272225240.14800-100000@geo.geocast.net>
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In article <Pine.GSO.4.03.9902272225240.14800-100000@geo.geocast.net>,
Castor Fu <castor@geocast.net> wrote:
> I'm trying to use the bus_dma interface with 3.1-RELEASE and
> the bus_dmamap_load routine appears to compile incorrectly with
> the default C compiler and default flags.
>
> It somehow fouls up in detecting the first segment and generates
> two segments, the first of which is garbage.
>
> Has anyone seen anything like this? I realize these routines are
> not used much yet in current drivers.
>
> Putting in a few printfs seems to get the compiler to do the right thing.
What optimization level are you using? Anything higher than "-O" is
not guaranteed to work.
John
--
John Polstra jdp@polstra.com
John D. Polstra & Co., Inc. Seattle, Washington USA
"Nobody ever went broke underestimating the taste of the American public."
-- H. L. Mencken
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