From: Roland Dreier <rolandd@cisco.com>
Date: Thu, 19 Apr 2007 03:20:28 +0000 (-0700)
Subject: IB: Put rlimit accounting struct in struct ib_umem
X-Git-Tag: v2.6.22-rc1~130^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1bf66a30421ca772820f489d88c16d0c430d6a67;p=pandora-kernel.git

IB: Put rlimit accounting struct in struct ib_umem

When memory pinned with ib_umem_get() is released, ib_umem_release()
needs to subtract the amount of memory being unpinned from
mm->locked_vm.  However, ib_umem_release() may be called with
mm->mmap_sem already held for writing if the memory is being released
as part of an munmap() call, so it is sometimes necessary to defer
this accounting into a workqueue.

However, the work struct used to defer this accounting is dynamically
allocated before it is queued, so there is the possibility of failing
that allocation.  If the allocation fails, then ib_umem_release has no
choice except to bail out and leave the process with a permanently
elevated locked_vm.

Fix this by allocating the structure to defer accounting as part of
the original struct ib_umem, so there's no possibility of failing a
later allocation if creating the struct ib_umem and pinning memory
succeeds.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
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