video: fbdev: acornfb: remove free_unused_pages()

Patch series "mm: simplify free_highmem_page() and free_reserved_page()".

Let's simplify and unify free_highmem_page() and free_reserved_page().

This patch (of 2):

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

Link: https://lkml.kernel.org/r/20210126182113.19892-1-david@redhat.com
Link: https://lkml.kernel.org/r/20210126182113.19892-2-david@redhat.com
Fixes: ffd29195ed ("drivers/video/acornfb.c: remove dead code")
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "Peter Zijlstra (Intel)" <peterz@infradead.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Cc: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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;