Re: [PATCH 1/2] drm/amdgpu: use zero as start for dummy resource walks

[Deucher, Alexander]

[AMD Official Use Only - Internal Distribution Only]

Acked-by: Alex Deucher <alexander.deuc...@amd.com>
________________________________
From: amd-gfx <amd-gfx-boun...@lists.freedesktop.org> on behalf of Christian 
König <ckoenig.leichtzumer...@gmail.com>
Sent: Tuesday, March 23, 2021 10:54 AM
To: amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org>
Cc: Das, Nirmoy <nirmoy....@amd.com>; Chen, Guchun <guchun.c...@amd.com>
Subject: [PATCH 1/2] drm/amdgpu: use zero as start for dummy resource walks

When we don't have a physically backing store we should use zero instead
of the virtual start address since that isn't necessary a valid physical
one.

Signed-off-by: Christian König <christian.koe...@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
index 40f2adf305bc..e94362ccf9d5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_res_cursor.h
@@ -54,7 +54,7 @@ static inline void amdgpu_res_first(struct ttm_resource *res,
         struct drm_mm_node *node;

         if (!res || !res->mm_node) {
-               cur->start = start;
+               cur->start = 0;
                 cur->size = size;
                 cur->remaining = size;
                 cur->node = NULL;
--
2.25.1

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