The check for start + length >= total_vm_size is
wrong since start + length can be exactly the size of
the vm.
Fix the check to allow allocation to boundary.
Fixes a regression in commit 4dd738e9cd79
("drm/i915: Fix 32b overflow check in gen8_ppgtt_alloc_page_directories")
Testcase: igt/gem_evict_everything/swapping-interruptible
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90399
Tested-by: Lu Hua <huax.lu@xxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Dave Gordon <david.s.gordon@xxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Michel Thierry <michel.thierry@xxxxxxxxx>
Signed-off-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c b/drivers/gpu/drm/i915/i915_gem_gtt.c
index e3bcc3b..17b7df0 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -757,7 +757,7 @@ static int gen8_ppgtt_alloc_page_directories(struct i915_hw_ppgtt *ppgtt,
WARN_ON(!bitmap_empty(new_pds, GEN8_LEGACY_PDPES));
/* FIXME: upper bound must not overflow 32 bits */
- WARN_ON((start + length) >= (1ULL << 32));
+ WARN_ON((start + length) > (1ULL << 32));
gen8_for_each_pdpe(pd, pdp, start, length, temp, pdpe) {
if (pd)
--
1.9.1
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