From: Chris Wilson Date: Tue, 18 Sep 2012 09:04:02 +0000 (+0100) Subject: drm/i915: Assert that the exec object lookup table is a power-of-two X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=41783eea1a7f7d033ace4fd78218dd5f37b2db5f;p=linux-beck.git drm/i915: Assert that the exec object lookup table is a power-of-two As we make the simplification of using a power-of-two size for the execbuffer handle-to-object TLB, we should validate that this is actually true and so clarify that premise. Signed-off-by: Chris Wilson Signed-off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c index 8186f63474f4..6a2f3e50c714 100644 --- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c +++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c @@ -44,6 +44,7 @@ eb_create(int size) { struct eb_objects *eb; int count = PAGE_SIZE / sizeof(struct hlist_head) / 2; + BUILD_BUG_ON(!is_power_of_2(PAGE_SIZE / sizeof(struct hlist_head))); while (count > size) count >>= 1; eb = kzalloc(count*sizeof(struct hlist_head) +