From: Hugh Dickins <hugh@veritas.com>
Date: Tue, 22 Nov 2005 05:32:17 +0000 (-0800)
Subject: [PATCH] unpaged: COW on VM_UNPAGED
X-Git-Tag: v2.6.15-rc3~114
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=920fc356f58d0e455bdfa53451f1c58eb211a846;p=pandora-kernel.git

[PATCH] unpaged: COW on VM_UNPAGED

Remove the BUG_ON(vma->vm_flags & VM_UNPAGED) from do_wp_page, and let it do
Copy-On-Write without touching the VM_UNPAGED's page counts - but this is
incomplete, because the anonymous page it inserts will itself need to be
handled, here and in other functions - next patch.

We still don't copy the page if the pfn is invalid, because the
copy_user_highpage interface does not allow it.  But that's not been a problem
in the past: can be added in later if the need arises.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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