gpu: nvgpu: Compute reasonable max order for allocator

Compute a reasonable maximum order for buddy allocators that are
created with a max_order of 0. Previously the max_order was just
left as 0.

Change-Id: I5c2f878fcd390610a4c02ac65189138ec7db30c8
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/1169763
Reviewed-by: Terje Bergstrom <tbergstrom@nvidia.com>
Tested-by: Terje Bergstrom <tbergstrom@nvidia.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c b/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
index 2b351492..fd721709 100644
--- a/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
+++ b/drivers/gpu/nvgpu/gk20a/gk20a_allocator.c
@@ -90,6 +90,11 @@ static void balloc_compute_max_order(struct gk20a_allocator *a)
 {
         u64 true_max_order = ilog2(a->blks);
 
+        if (a->max_order == 0) {
+                a->max_order = true_max_order;
+                return;
+        }
+
         if (a->max_order > true_max_order)
                 a->max_order = true_max_order;
         if (a->max_order > GPU_BALLOC_MAX_ORDER)