From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 30 Jan 2008 12:34:03 +0000 (+0100)
Subject: x86: add kernel_map_pages() to 64-bit
X-Git-Tag: v2.6.25-rc1~1143^2~85
X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=ace63e3743ae59fc0cce48450bd2e410776b4148;p=linux-2.6-omap-h63xx.git

x86: add kernel_map_pages() to 64-bit

needed for DEBUG_PAGEALLOC support and for unification.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

diff --git a/arch/x86/mm/pageattr_64.c b/arch/x86/mm/pageattr_64.c
index 4053832d410..e1c860800ff 100644
--- a/arch/x86/mm/pageattr_64.c
+++ b/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