[PATCH] drm/imagination: Ensure PVR_MIPS_PT_PAGE_COUNT is never zero

[Matt Coster]

When the host page size was more than 4 times larger than the FW page
size, this macro evaluated to zero resulting in zero-sized arrays.

Use DIV_ROUND_UP() to ensure the correct behavior.

Reported-by: 20240228012313.5934-1-yaolu at kylinos.cn
Closes: https://lore.kernel.org/dri-devel/20240228012313.5934-1-yaolu@kylinos.cn
Fixes: 927f3e0253c1 ("drm/imagination: Implement MIPS firmware processor and MMU support")
Signed-off-by: Matt Coster <matt.coster at imgtec.com>
---
 drivers/gpu/drm/imagination/pvr_fw_mips.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/imagination/pvr_fw_mips.h b/drivers/gpu/drm/imagination/pvr_fw_mips.h
index 408dbe63a90c..a0c5c41c8aa2 100644
--- a/drivers/gpu/drm/imagination/pvr_fw_mips.h
+++ b/drivers/gpu/drm/imagination/pvr_fw_mips.h
@@ -7,13 +7,14 @@
 #include "pvr_rogue_mips.h"
 
 #include <asm/page.h>
+#include <linux/math.h>
 #include <linux/types.h>
 
 /* Forward declaration from pvr_gem.h. */
 struct pvr_gem_object;
 
-#define PVR_MIPS_PT_PAGE_COUNT ((ROGUE_MIPSFW_MAX_NUM_PAGETABLE_PAGES * ROGUE_MIPSFW_PAGE_SIZE_4K) \
-				>> PAGE_SHIFT)
+#define PVR_MIPS_PT_PAGE_COUNT DIV_ROUND_UP(ROGUE_MIPSFW_MAX_NUM_PAGETABLE_PAGES * ROGUE_MIPSFW_PAGE_SIZE_4K, PAGE_SIZE)
+
 /**
  * struct pvr_fw_mips_data - MIPS-specific data
  */

base-commit: e95752752eaf06c860811ac5ddf9badf6c1b43ca
-- 
2.44.0

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