From: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date: Tue, 17 Jun 2014 18:03:00 +0000 (+0300)
Subject: drm/i915: Don't prefault the entire obj if the vma is smaller
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~125^2~63^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=beff0d0f6121f6a2a818a050a1e4d91706b3f190;p=pandora-kernel.git

drm/i915: Don't prefault the entire obj if the vma is smaller

Take the minimum of the object size and the vma size and prefault
only that much. Avoids a SIGBUS when mmapping only a portion of the
object.

Prefaulting was introduced here:
 commit b90b91d87038f6b257b40a02b42ed4f9705e06f0
 Author: Chris Wilson <chris@chris-wilson.co.uk>
 Date:   Tue Jun 10 12:14:40 2014 +0100

    drm/i915: Prefault the entire object on first page fault

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Testcase: igt/gem_mmap/short-mmap
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

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