From 04add672cf98a788e9e0d753b2ccfa4a3a0caf56 Mon Sep 17 00:00:00 2001
From: Al Viro <viro@ftp.linux.org.uk>
Date: Thu, 1 Feb 2007 13:53:04 +0000
Subject: [PATCH] [PATCH] uml-i386: fix build breakage with CONFIG_HIGHMEM

missing helper used by arch/i386/mm/highmem.c, which is pulled
into build on that configuration.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 include/asm-um/pgtable.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/asm-um/pgtable.h b/include/asm-um/pgtable.h
index 188f7262177..e57ff136ee5 100644
--- a/include/asm-um/pgtable.h
+++ b/include/asm-um/pgtable.h
@@ -408,6 +408,15 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 
 #include <asm-generic/pgtable-nopud.h>
 
+#ifdef CONFIG_HIGHMEM
+/* Clear a kernel PTE and flush it from the TLB */
+#define kpte_clear_flush(ptep, vaddr)					\
+do {									\
+	pte_clear(&init_mm, vaddr, ptep);				\
+	__flush_tlb_one(vaddr);						\
+} while (0)
+#endif
+
 #endif
 #endif