[PATCH v2] drm/panfrost: Document base field location constraint in panfrost_gem_object

[Boris Brezillon]

I've spent hours chasing a memory corruption that was caused by
insertion of an extra field field before ->base. Let's document the
fact that base has to be the first field in panfrost_gem_object.

Signed-off-by: Boris Brezillon <boris.brezillon at collabora.com>
---
Changes in v2:
* Use the proper prefix in the subject line
---
 drivers/gpu/drm/panfrost/panfrost_gem.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.h b/drivers/gpu/drm/panfrost/panfrost_gem.h
index b3517ff9630c..d480261fc177 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem.h
+++ b/drivers/gpu/drm/panfrost/panfrost_gem.h
@@ -10,6 +10,10 @@
 struct panfrost_mmu;
 
 struct panfrost_gem_object {
+	/*
+	 * Must be the first element because we're using some of the
+	 * drm_gem_shmem helpers.
+	 */
 	struct drm_gem_shmem_object base;
 	struct sg_table *sgts;
 
-- 
2.23.0