From: Jens Axboe <jens.axboe@oracle.com>
To: "Raz Ben-Jehuda(caro)" <raziebe@gmail.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: kmap_atomic in 2.6.20.x
Date: Wed, 6 Jun 2007 21:17:29 +0200 [thread overview]
Message-ID: <20070606191729.GE4735@kernel.dk> (raw)
In-Reply-To: <5d96567b0706061003r462c324i733ad3698ac3d90c@mail.gmail.com>
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
next prev parent reply other threads:[~2007-06-06 19:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-06-06 17:03 Raz Ben-Jehuda(caro)
2007-06-06 19:17 ` Jens Axboe [this message]
2007-06-07 8:56 ` Raz Ben-Jehuda(caro)
2007-06-06 20:03 ` Trond Myklebust
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