From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jamie Lokier <jamie@shareable.org>
Subject: Re: sys_poll/do_poll/f_op->poll
Date: Thu, 2 Mar 2006 08:09:30 +0000
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To: Shaya Potter <spotter@cs.columbia.edu>
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Shaya Potter wrote:
> am I missing something or do none of the in kernel file system use this
> code (and would therefore sys_poll() not work on them?)

sys_poll() is _required_ by tradition and standards
to return (at least) POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM
for regular files.

That's why there are no poll operations for files in any filesystem.

-- Jamie