From: Clemens Ladisch <clemens@ladisch.de>
To: Krishna Gopal <linuxkrishna@gmail.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Accessing peripheral register directly from userspace
Date: Tue, 13 Apr 2010 13:36:13 +0200 [thread overview]
Message-ID: <4BC4572D.10502@ladisch.de> (raw)
In-Reply-To: <q2m68f510a71004121001v370509fftc6f4b86c4420b509@mail.gmail.com>
Krishna Gopal wrote:
> Would there be any issues for optimization purpose I do a mmap to a
> peripheral register to directly access it from userspace ?
This means that userspace could access any register in the same page.
Usually this is done only with read-only pages and with devices that
are designed for this so that all accessible registers are 'safe'.
Regards,
Clemens
prev parent reply other threads:[~2010-04-13 11:37 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-04-12 17:01 Accessing peripheral register directly from userspace Krishna Gopal
2010-04-13 11:36 ` Clemens Ladisch [this message]
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