From: KyongHo Cho <pullip.cho@samsung.com>
Date: Thu, 5 Feb 2015 05:52:42 +0000 (-0300)
Subject: [media] v4l: vb2-memops: use vma slab when vma allocation
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5ed1c328ea077d70e1ebcd5188dc77cdc754df3a;p=linux-beck.git

[media] v4l: vb2-memops: use vma slab when vma allocation

The slab for vm_area_struct which is vm_area_cachep is already prepared
for the general use. Instead of kmalloc() for the vma copy for userptr,
allocation from vm_area_cachep is more beneficial.

CC: Hans Verkuil <hans.verkuil@cisco.com>
CC: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Cho KyongHo <pullip.cho@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
---

diff --git a/drivers/media/v4l2-core/videobuf2-memops.c b/drivers/media/v4l2-core/videobuf2-memops.c
index 81c1ad8b2cf1..dd06efa667fd 100644
--- a/drivers/media/v4l2-core/videobuf2-memops.c
+++ b/drivers/media/v4l2-core/videobuf2-memops.c
@@ -37,7 +37,7 @@ struct vm_area_struct *vb2_get_vma(struct vm_area_struct *vma)
 {
 	struct vm_area_struct *vma_copy;
 
-	vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
+	vma_copy = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL);
 	if (vma_copy == NULL)
 		return NULL;
 
@@ -75,7 +75,7 @@ void vb2_put_vma(struct vm_area_struct *vma)
 	if (vma->vm_file)
 		fput(vma->vm_file);
 
-	kfree(vma);
+	kmem_cache_free(vm_area_cachep, vma);
 }
 EXPORT_SYMBOL_GPL(vb2_put_vma);