linux-kernel - [PATCH v1 1/2] video: fbdev: acornfb: remove free_unused

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Date:   Tue, 26 Jan 2021 19:21:12 +0100
From:   David Hildenbrand <david@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, linux-fbdev@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Mike Rapoport <rppt@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        Michal Hocko <mhocko@...nel.org>,
        Wei Yang <richard.weiyang@...ux.alibaba.com>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Sam Ravnborg <sam@...nborg.org>
Subject: [PATCH v1 1/2] video: fbdev: acornfb: remove free_unused_pages()

This function is never used and it is one of the last remaining user of
__free_reserved_page(). Let's just drop it.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
Cc: Mike Rapoport <rppt@...nel.org>
Cc: Oscar Salvador <osalvador@...e.de>
Cc: Michal Hocko <mhocko@...nel.org>
Cc: Wei Yang <richard.weiyang@...ux.alibaba.com>
Cc: "Gustavo A. R. Silva" <gustavoars@...nel.org>
Cc: Sam Ravnborg <sam@...nborg.org>
Signed-off-by: David Hildenbrand <david@...hat.com>
---
 drivers/video/fbdev/acornfb.c | 34 ----------------------------------
 1 file changed, 34 deletions(-)

diff --git a/drivers/video/fbdev/acornfb.c b/drivers/video/fbdev/acornfb.c
index bcc92aecf666..1b72edc01cfb 100644
--- a/drivers/video/fbdev/acornfb.c
+++ b/drivers/video/fbdev/acornfb.c
@@ -921,40 +921,6 @@ 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);
-		__free_reserved_page(page);
-
-		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;
-- 
2.29.2