From bc7af9e652c91bc6fe1c357b2b98fa4cd2be2bfa Mon Sep 17 00:00:00 2001
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Date: Sun, 6 May 2007 14:50:09 -0700
Subject: [PATCH] --- yaml --- r: 54233 b: refs/heads/master c:
 afa37394d6bfc91907b0e08c902d36d848232b99 h: refs/heads/master i:   54231:
 e7d46aeac09353aaa576006a6ec1ae35d5f9fff5 v: v3

---
 [refs]                            | 2 +-
 trunk/arch/ia64/kernel/sys_ia64.c | 7 +++++++
 trunk/arch/ia64/mm/hugetlbpage.c  | 8 ++++++++
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index f1ad457dec37..700a39cbe6e5 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 5a8130f2b186ac91190d1dcea875d66d08e6a1de
+refs/heads/master: afa37394d6bfc91907b0e08c902d36d848232b99
diff --git a/trunk/arch/ia64/kernel/sys_ia64.c b/trunk/arch/ia64/kernel/sys_ia64.c
index 9ef62a3fbfad..2fcaa2051aa3 100644
--- a/trunk/arch/ia64/kernel/sys_ia64.c
+++ b/trunk/arch/ia64/kernel/sys_ia64.c
@@ -33,6 +33,13 @@ arch_get_unmapped_area (struct file *filp, unsigned long addr, unsigned long len
 	if (len > RGN_MAP_LIMIT)
 		return -ENOMEM;
 
+	/* handle fixed mapping: prevent overlap with huge pages */
+	if (flags & MAP_FIXED) {
+		if (is_hugepage_only_range(mm, addr, len))
+			return -EINVAL;
+		return addr;
+	}
+
 #ifdef CONFIG_HUGETLB_PAGE
 	if (REGION_NUMBER(addr) == RGN_HPAGE)
 		addr = 0;
diff --git a/trunk/arch/ia64/mm/hugetlbpage.c b/trunk/arch/ia64/mm/hugetlbpage.c
index 0c7e94edc20e..c7c90f4f4298 100644
--- a/trunk/arch/ia64/mm/hugetlbpage.c
+++ b/trunk/arch/ia64/mm/hugetlbpage.c
@@ -148,6 +148,14 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr, u
 		return -ENOMEM;
 	if (len & ~HPAGE_MASK)
 		return -EINVAL;
+
+	/* Handle MAP_FIXED */
+	if (flags & MAP_FIXED) {
+		if (prepare_hugepage_range(addr, len, pgoff))
+			return -EINVAL;
+		return addr;
+	}
+
 	/* This code assumes that RGN_HPAGE != 0. */
 	if ((REGION_NUMBER(addr) != RGN_HPAGE) || (addr & (HPAGE_SIZE - 1)))
 		addr = HPAGE_REGION_BASE;