patch-2.3.23 linux/mm/bigmem.c

• Lines: 72
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.22/linux/mm/bigmem.c
• Orig date: Tue Aug 31 17:29:15 1999

diff -u --recursive --new-file v2.3.22/linux/mm/bigmem.c linux/mm/bigmem.c
@@ -1,71 +0,0 @@
-/*
- * BIGMEM common code and variables.
- *
- * (C) 1999 Andrea Arcangeli, SuSE GmbH, andrea@suse.de
- *          Gerhard Wichert, Siemens AG, Gerhard.Wichert@pdb.siemens.de
- */
-
-#include <linux/mm.h>
-#include <linux/pagemap.h>
-#include <linux/bigmem.h>
-
-unsigned long bigmem_mapnr;
-int nr_free_bigpages = 0;
-
-struct page * prepare_bigmem_swapout(struct page * page)
-{
-	/* if this is a bigmem page so it can't be swapped out directly
-	   otherwise the b_data buffer addresses will break
-	   the lowlevel device drivers. */
-	if (PageBIGMEM(page)) {
-		unsigned long regular_page;
-		unsigned long vaddr;
-
-		regular_page = __get_free_page(GFP_ATOMIC);
-		if (!regular_page)
-			return NULL;
-
-		vaddr = kmap(page_address(page), KM_READ);
-		copy_page(regular_page, vaddr);
-		kunmap(vaddr, KM_READ);
-
-		/* ok, we can just forget about our bigmem page since 
-		   we stored its data into the new regular_page. */
-		__free_page(page);
-
-		page = MAP_NR(regular_page) + mem_map;
-	}
-	return page;
-}
-
-struct page * replace_with_bigmem(struct page * page)
-{
-	if (!PageBIGMEM(page) && nr_free_bigpages) {
-		unsigned long kaddr;
-
-		kaddr = __get_free_page(GFP_ATOMIC|GFP_BIGMEM);
-		if (kaddr) {
-			struct page * bigmem_page;
-
-			bigmem_page = MAP_NR(kaddr) + mem_map;
-			if (PageBIGMEM(bigmem_page)) {
-				unsigned long vaddr;
-
-				vaddr = kmap(kaddr, KM_WRITE);
-				copy_page(vaddr, page_address(page));
-				kunmap(vaddr, KM_WRITE);
-
-				/* Preserve the caching of the swap_entry. */
-				bigmem_page->offset = page->offset;
-
-				/* We can just forget the old page since 
-				   we stored its data into the new
-				   bigmem_page. */
-				__free_page(page);
-
-				page = bigmem_page;
-			}
-		}
-	}
-	return page;
-}