# \[PATCH v8, part3 06/14\] mm, acornfb: use free\_reserved\_area() to simplify code

- Subsystems: FRAMEBUFFER LAYER, THE REST
- Maintainers: Helge Deller, Linus Torvalds
- Revision v8 (5 revisions archived).
- List: linux-fbdev
- 3 messages, 2 authors
- Page: https://ratatoskr.run/linux-fbdev/2013/05/4055025/t

## \[PATCH v8, part3 06/14\] mm, acornfb: use free\_reserved\_area() to simplify code

- From: Jiang Liu \<hidden\>
- Date: 2013-05-26 13:41:52 
- Message: https://ratatoskr.run/linux-fbdev/2013/05/4055025.md

```text
Use common help function free_reserved_area() to simplify code.

Signed-off-by: Jiang Liu <redacted>
Cc: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: <redacted>
Cc: <redacted>
---
 drivers/video/acornfb.c | 45 ++++++---------------------------------------
 1 file changed, 6 insertions(+), 39 deletions(-)

diff --git a/drivers/video/acornfb.c b/drivers/video/acornfb.c
index 6488a73..8f7374f 100644
--- a/drivers/video/acornfb.c
+++ b/drivers/video/acornfb.c
@@ -1180,42 +1180,6 @@ static int acornfb_detect_monitortype(void)
 	return 4;
 }
 
-/*
- * This enables the unused memory to be freed on older Acorn machines.
- * We are freeing memory on behalf of the architecture initialisation
- * code here.
- */
-static inline void
-free_unused_pages(unsigned int virtual_start, unsigned int virtual_end)
-{
-	int mb_freed = 0;
-
-	/*
-	 * Align addresses
-	 */
-	virtual_start = PAGE_ALIGN(virtual_start);
-	virtual_end = PAGE_ALIGN(virtual_end);
-
-	while (virtual_start < virtual_end) {
-		struct page *page;
-
-		/*
-		 * Clear page reserved bit,
-		 * set count to 1, and free
-		 * the page.
-		 */
-		page = virt_to_page(virtual_start);
-		ClearPageReserved(page);
-		init_page_count(page);
-		free_page(virtual_start);
-
-		virtual_start += PAGE_SIZE;
-		mb_freed += PAGE_SIZE / 1024;
-	}
-
-	printk("acornfb: freed %dK memory\n", mb_freed);
-}
-
 static int acornfb_probe(struct platform_device *dev)
 {
 	unsigned long size;
@@ -1312,10 +1276,13 @@ static int acornfb_probe(struct platform_device *dev)
 #endif
 #if defined(HAS_VIDC)
 	/*
-	 * Archimedes/A5000 machines use a fixed address for their
-	 * framebuffers.  Free unused pages
+	 * We are freeing memory on behalf of the architecture initialisation
+	 * code here. Archimedes/A5000 machines use a fixed address for their
+	 * framebuffers.
 	 */
-	free_unused_pages(PAGE_OFFSET + size, PAGE_OFFSET + MAX_SIZE);
+	free_reserved_area((void *)(PAGE_OFFSET + size),
+			   (void *)PAGE_ALIGN(PAGE_OFFSET + MAX_SIZE),
+			   -1, "acornfb");
 #endif
 
 	fb_info.fix.smem_len = size;
-- 
1.8.1.2

```

## Re: \[PATCH v8, part3 06/14\] mm, acornfb: use free\_reserved\_area() to simplify code

- From: Andrew Morton \<akpm@linux-foundation.org\>
- Date: 2013-05-30 21:58:55 
- Message: https://ratatoskr.run/linux-fbdev/2013/05/4057639.md

```text
On Sun, 26 May 2013 21:38:34 +0800 Jiang Liu [ref] wrote:

> Use common help function free_reserved_area() to simplify code.

http://ozlabs.org/~akpm/mmots/broken-out/drivers-video-acornfbc-remove-dead-code.patch
removes all the code which your patch alters.
```

## Re: \[PATCH v8, part3 06/14\] mm, acornfb: use free\_reserved\_area() to simplify code

- From: Jiang Liu \<hidden\>
- Date: 2013-05-31 04:31:26 
- Message: https://ratatoskr.run/linux-fbdev/2013/05/4057736.md

```text
On Fri 31 May 2013 05:58:44 AM CST, Andrew Morton wrote:
> On Sun, 26 May 2013 21:38:34 +0800 Jiang Liu [ref] wrote:
>
>> Use common help function free_reserved_area() to simplify code.
>
> http://ozlabs.org/~akpm/mmots/broken-out/drivers-video-acornfbc-remove-dead-code.patch
> removes all the code which your patch alters.
Thanks Andrew, please just drop that patch.

```