[PATCH] media: rkvdec: vp9: Fix probs struct alignment

[Detlev Casanova]

When building for arm 32 bits, the struct alignment changes and the compiler
adds 3 padding bits to the anonymous mv struct in
rkvdec_vp9_inter_frame_probs.

Therefore, the BUILD_BUG_ON used to check that the struct size is aligned
to 128 bits (hardware requirement) fails.

As that mv struct is at the end of the global rkvdec_vp9_probs struct
and is followed by 11 padding bits, the 3 padding bits can be explicitely
set in the mv struct and removed from the 11 following it.

This makes sure that the mv struct is 32 bits aligned.

Reported-by: kernel test robot <lkp at intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202512110229.R6YCf1Le-lkp@intel.com/
Fixes: d968e50b5c26 ("media: rkvdec: Unstage the driver")
Suggested-by: Nicolas Dufresne <nicolas.dufresne at collabora.com>
Signed-off-by: Detlev Casanova <detlev.casanova at collabora.com>
---
 drivers/media/platform/rockchip/rkvdec/rkvdec-vp9.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/rockchip/rkvdec/rkvdec-vp9.c b/drivers/media/platform/rockchip/rkvdec/rkvdec-vp9.c
index b4bf01e839ef..23c733ca2e8e 100644
--- a/drivers/media/platform/rockchip/rkvdec/rkvdec-vp9.c
+++ b/drivers/media/platform/rockchip/rkvdec/rkvdec-vp9.c
@@ -66,6 +66,8 @@ struct rkvdec_vp9_inter_frame_probs {
 		u8 fr[2][3];
 		u8 class0_hp[2];
 		u8 hp[2];
+		/* 32 bit alignment */
+		u8 padding6[3];
 	} mv;
 };
 
@@ -85,7 +87,7 @@ struct rkvdec_vp9_probs {
 		struct rkvdec_vp9_intra_only_frame_probs intra_only;
 	};
 	/* 128 bit alignment */
-	u8 padding1[11];
+	u8 padding1[8];
 };
 
 /* Data structure describing auxiliary buffer format. */
-- 
2.52.0