linux-kernel - [PATCH 2.6.21 0/8] ehca: remove use of do_mmap() from kernel space and minor cleanup

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Date:	Thu, 11 Jan 2007 18:07:08 +0100
From:	Hoang-Nam Nguyen <hnguyen@...ux.vnet.ibm.com>
To:	Roland Dreier <rdreier@...co.com>, hch@...radead.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	openfabrics-ewg@...nib.org, openib-general@...nib.org
Cc:	raisch@...ibm.com
Subject: [PATCH 2.6.21 0/8] ehca: remove use of do_mmap() from kernel space and minor cleanup

Hello Roland and Christoph H.!
Here is a set of patches for ehca, whose main purpose is to remove unproper use of
do_mmap() in ehca kernel space as suggested by Christoph H. Other "small" changes
are:
* Remove "dead" prototype declarations (those without code implementation)
* Use SLAB_ defines instead GFP_ ones when allocating memory from slab cache

Actually I should separate those patches for more clarity. Unfortunately that
code cleanup above has been incorporated much earlier in our repository, and
I had not paid attention on when I started to rework the mmap() stuff. Sorry
for this inconvenience!

Now more detail on mmap() rework:
- For eHCA hardware register block we use remap_pfn_range() as previously.
- For queue pages we call pattern vm_insert_page() to register each allocated
kernel page.
- For each mmap-ed resource (hardware register block, send/recv and completion
queue) we introduce a use counter that is incremented and decremented by
the call-backs open()/close(). Destroying a completion queue or queue pair
will succeed only if all associated counters are zero. That means those resources
must be mmap-ed resp. munmap-ed properly by user space.

Thanks
Nam
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