From 59153e34a2ff7110e7ef52f735dd7d413e551e74 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 30 Jan 2008 13:34:03 +0100
Subject: [PATCH] --- yaml --- r: 80490 b: refs/heads/master c:
 ace63e3743ae59fc0cce48450bd2e410776b4148 h: refs/heads/master v: v3

---
 [refs]                          |  2 +-
 trunk/arch/x86/mm/pageattr_64.c | 30 ++++++++++++++++++++++++++++++
 2 files changed, 31 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 760a053227e5..0cbf2c124468 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: f5a50ce1bf53a07cb7d0bab1a87e62cc4f34f0ab
+refs/heads/master: ace63e3743ae59fc0cce48450bd2e410776b4148
diff --git a/trunk/arch/x86/mm/pageattr_64.c b/trunk/arch/x86/mm/pageattr_64.c
index 4053832d4108..e1c860800ff1 100644
--- a/trunk/arch/x86/mm/pageattr_64.c
+++ b/trunk/arch/x86/mm/pageattr_64.c
@@ -260,3 +260,33 @@ void global_flush_tlb(void)
 	on_each_cpu(flush_kernel_map, NULL, 1, 1);
 }
 EXPORT_SYMBOL(global_flush_tlb);
+
+#ifdef CONFIG_DEBUG_PAGEALLOC
+void kernel_map_pages(struct page *page, int numpages, int enable)
+{
+	if (PageHighMem(page))
+		return;
+	if (!enable) {
+		debug_check_no_locks_freed(page_address(page),
+					   numpages * PAGE_SIZE);
+	}
+
+	/*
+	 * If page allocator is not up yet then do not call c_p_a():
+	 */
+	if (!debug_pagealloc_enabled)
+		return;
+
+	/*
+	 * the return value is ignored - the calls cannot fail,
+	 * large pages are disabled at boot time.
+	 */
+	change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
+
+	/*
+	 * we should perform an IPI and flush all tlbs,
+	 * but that can deadlock->flush only current cpu.
+	 */
+	__flush_tlb_all();
+}
+#endif