1 files changed, 0 insertions, 151 deletions
diff --git a/mm/debug-pagealloc.c b/mm/debug-pagealloc.c
deleted file mode 100644
index 100963091cc6..000000000000
--- a/mm/debug-pagealloc.c
+++ /dev/null
@@ -1,151 +0,0 @@
-#include <linux/kernel.h>
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/highmem.h>
-#include <linux/page_ext.h>
-#include <linux/poison.h>
-#include <linux/ratelimit.h>
-
-#ifndef mark_addr_rdonly
-#define mark_addr_rdonly(a)
-#endif
-
-#ifndef mark_addr_rdwrite
-#define mark_addr_rdwrite(a)
-#endif
-
-static bool page_poisoning_enabled __read_mostly;
-
-static bool need_page_poisoning(void)
-{
-	if (!debug_pagealloc_enabled())
-		return false;
-
-	return true;
-}
-
-static void init_page_poisoning(void)
-{
-	if (!debug_pagealloc_enabled())
-		return;
-
-	page_poisoning_enabled = true;
-}
-
-struct page_ext_operations page_poisoning_ops = {
-	.need = need_page_poisoning,
-	.init = init_page_poisoning,
-};
-
-static inline void set_page_poison(struct page *page)
-{
-	struct page_ext *page_ext;
-
-	page_ext = lookup_page_ext(page);
-	__set_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags);
-}
-
-static inline void clear_page_poison(struct page *page)
-{
-	struct page_ext *page_ext;
-
-	page_ext = lookup_page_ext(page);
-	__clear_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags);
-}
-
-static inline bool page_poison(struct page *page)
-{
-	struct page_ext *page_ext;
-
-	page_ext = lookup_page_ext(page);
-	return test_bit(PAGE_EXT_DEBUG_POISON, &page_ext->flags);
-}
-
-static void poison_page(struct page *page)
-{
-	void *addr = kmap_atomic(page);
-
-	set_page_poison(page);
-	memset(addr, PAGE_POISON, PAGE_SIZE);
-	mark_addr_rdonly(addr);
-	kunmap_atomic(addr);
-}
-
-static void poison_pages(struct page *page, int n)
-{
-	int i;
-
-	for (i = 0; i < n; i++)
-		poison_page(page + i);
-}
-
-static bool single_bit_flip(unsigned char a, unsigned char b)
-{
-	unsigned char error = a ^ b;
-
-	return error && !(error & (error - 1));
-}
-
-static void check_poison_mem(struct page *page,
-			     unsigned char *mem, size_t bytes)
-{
-	static DEFINE_RATELIMIT_STATE(ratelimit, 5 * HZ, 10);
-	unsigned char *start;
-	unsigned char *end;
-
-	start = memchr_inv(mem, PAGE_POISON, bytes);
-	if (!start)
-		return;
-
-	for (end = mem + bytes - 1; end > start; end--) {
-		if (*end != PAGE_POISON)
-			break;
-	}
-
-	if (!__ratelimit(&ratelimit))
-		return;
-	else if (start == end && single_bit_flip(*start, PAGE_POISON))
-		pr_err("pagealloc: single bit error on page with phys start 0x%lx\n",
-			(unsigned long)page_to_phys(page));
-	else
-		pr_err("pagealloc: memory corruption on page with phys start 0x%lx\n",
-			(unsigned long)page_to_phys(page));
-
-	print_hex_dump(KERN_ERR, "", DUMP_PREFIX_ADDRESS, 16, 1, start,
-			end - start + 1, 1);
-	BUG_ON(PANIC_CORRUPTION);
-	dump_stack();
-}
-
-static void unpoison_page(struct page *page)
-{
-	void *addr;
-
-	if (!page_poison(page))
-		return;
-
-	addr = kmap_atomic(page);
-	check_poison_mem(page, addr, PAGE_SIZE);
-	mark_addr_rdwrite(addr);
-	clear_page_poison(page);
-	kunmap_atomic(addr);
-}
-
-static void unpoison_pages(struct page *page, int n)
-{
-	int i;
-
-	for (i = 0; i < n; i++)
-		unpoison_page(page + i);
-}
-
-void __kernel_map_pages(struct page *page, int numpages, int enable)
-{
-	if (!page_poisoning_enabled)
-		return;
-
-	if (enable)
-		unpoison_pages(page, numpages);
-	else
-		poison_pages(page, numpages);
-}