linux-kernel - [PATCH 2/5] uio: Kill unused vma

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Date:	Mon, 20 Sep 2010 00:21:36 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	"Hans J. Koch" <hjk@...utronix.de>
Cc:	Greg Kroah-Hartman <gregkh@...e.de>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 2/5] uio: Kill unused vma_count.


Remove the tracking of how many vmas are using in the uio memory
mapping mode.  The uio code doesn't use that information anywhere.

Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>
---
 drivers/uio/uio.c |   16 ----------------
 1 files changed, 0 insertions(+), 16 deletions(-)

diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index 565559c..95f25ae 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -35,7 +35,6 @@ struct uio_device {
 	atomic_t		event;
 	struct fasync_struct	*async_queue;
 	wait_queue_head_t	wait;
-	int			vma_count;
 	struct uio_info		*info;
 	struct kobject		*map_dir;
 	struct kobject		*portio_dir;
@@ -599,18 +598,6 @@ static int uio_find_mem_index(struct vm_area_struct *vma)
 	return -1;
 }
 
-static void uio_vma_open(struct vm_area_struct *vma)
-{
-	struct uio_device *idev = vma->vm_private_data;
-	idev->vma_count++;
-}
-
-static void uio_vma_close(struct vm_area_struct *vma)
-{
-	struct uio_device *idev = vma->vm_private_data;
-	idev->vma_count--;
-}
-
 static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 {
 	struct uio_device *idev = vma->vm_private_data;
@@ -638,8 +625,6 @@ static int uio_vma_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
 }
 
 static const struct vm_operations_struct uio_vm_ops = {
-	.open = uio_vma_open,
-	.close = uio_vma_close,
 	.fault = uio_vma_fault,
 };
 
@@ -665,7 +650,6 @@ static int uio_mmap_logical(struct vm_area_struct *vma)
 {
 	vma->vm_flags |= VM_RESERVED;
 	vma->vm_ops = &uio_vm_ops;
-	uio_vma_open(vma);
 	return 0;
 }
 
-- 
1.7.2.2

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