linux-kernel - Re: kmap_atomic in 2.6.20.x

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Message-ID: <5d96567b0706070156g7f94c7a3te022b4ea4cb57c74@mail.gmail.com>
Date:	Thu, 7 Jun 2007 11:56:27 +0300
From:	"Raz Ben-Jehuda(caro)" <raziebe@...il.com>
To:	"Jens Axboe" <jens.axboe@...cle.com>
Cc:	"Linux Kernel" <linux-kernel@...r.kernel.org>
Subject: Re: kmap_atomic in 2.6.20.x

On 6/6/07, Jens Axboe <jens.axboe@...cle.com> wrote:
> On Wed, Jun 06 2007, Raz Ben-Jehuda(caro) wrote:
> > Hello
> >
> > I am running into some problems with kmap_atomic in my driver.
> > My driver copies some pages coming from
> > user space to "kernel space kmalloc'ed memory".
> > I had this code running from 2.6.5 to 2.6.17 without any problems.
> > I have upgraded to 2.6.20.xx and this code fails to kmap_atomic.
> > I am running a uni processor 2 GRAM machine, 32bit.
> >
> > Basically this is code does:
> >
> > get_user_pages(page,...)
> >
> > kmap_atomic(page,KM_USER0);
> > .. copy and stuff
> > kunmap_atomic(page,KM_USER0)
>
> dst = kmap_atomic(page, KM_USER0);
> ...
> kunmap_atomic(dst, KM_USER0);
>
> Note the subtle difference.
>
> --
> Jens Axboe
>
>

hmm..... hammmm....haaaa
again...  many many thanks Jens.
You are correct.

-- 
Raz
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