linux-kernel - [PATCH] drm/rockchip: dma-mapping: Use vma

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Date:   Wed, 22 Nov 2017 16:24:07 +0100
From:   Vasyl Gomonovych <gomonovych@...il.com>
To:     mark.yao@...k-chips.com, airlied@...ux.ie, heiko@...ech.de,
        dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-rockchip@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, gomonovych@...il.com
Subject: [PATCH] drm/rockchip: dma-mapping: Use vma_pages helper

Use vma_pages function on vma object instead of explicit computation.
./drivers/gpu/drm/rockchip/rockchip_drm_gem.c:223:34-40: WARNING: Consider using vma_pages helper on vma
Generated by: scripts/coccinelle/api/vma_pages.cocci

Signed-off-by: Vasyl Gomonovych <gomonovych@...il.com>
---
 drivers/gpu/drm/rockchip/rockchip_drm_gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
index 1869c8bb76c8..1d9655576b6e 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_gem.c
@@ -220,7 +220,7 @@ static int rockchip_drm_gem_object_mmap_iommu(struct drm_gem_object *obj,
 {
 	struct rockchip_gem_object *rk_obj = to_rockchip_obj(obj);
 	unsigned int i, count = obj->size >> PAGE_SHIFT;
-	unsigned long user_count = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
+	unsigned long user_count = vma_pages(vma);
 	unsigned long uaddr = vma->vm_start;
 	unsigned long offset = vma->vm_pgoff;
 	unsigned long end = user_count + offset;
-- 
1.9.1