linux-kernel - Accessing peripheral register directly from userspace

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Message-ID: <q2m68f510a71004121001v370509fftc6f4b86c4420b509@mail.gmail.com>
Date:	Mon, 12 Apr 2010 12:01:36 -0500
From:	Krishna Gopal <linuxkrishna@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Accessing peripheral register directly from userspace

Would there be any issues for optimization purpose I do a mmap to a
peripheral register to directly access it from userspace ? This is
considering the peripheral already has a Kernel driver through which
you can set the register bit.

Basically I want to avoid the additional context switch on entering
the Kernel to set that one bit in the Peripheral register.

I request you to please share your thoughts.

Best regards,
Krishna
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