linux-kernel - [RFC/PATCH 6/15] get_unmapped_area handles MAP

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Message-Id: <20070322060239.BC328DE131@ozlabs.org>
Date:	Thu, 22 Mar 2007 17:00:56 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Linux Memory Management <linux-mm@...ck.org>
CC:	<linux-kernel@...r.kernel.org>
Subject: [RFC/PATCH 6/15] get_unmapped_area handles MAP_FIXED on ia64

Signed-off-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
---

 arch/ia64/kernel/sys_ia64.c |    7 +++++++
 arch/ia64/mm/hugetlbpage.c  |    8 ++++++++
 2 files changed, 15 insertions(+)

Index: linux-cell/arch/ia64/kernel/sys_ia64.c
===================================================================
--- linux-cell.orig/arch/ia64/kernel/sys_ia64.c	2007-03-22 15:10:45.000000000 +1100
+++ linux-cell/arch/ia64/kernel/sys_ia64.c	2007-03-22 15:10:47.000000000 +1100
@@ -33,6 +33,13 @@ arch_get_unmapped_area (struct file *fil
 	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;
Index: linux-cell/arch/ia64/mm/hugetlbpage.c
===================================================================
--- linux-cell.orig/arch/ia64/mm/hugetlbpage.c	2007-03-22 15:12:32.000000000 +1100
+++ linux-cell/arch/ia64/mm/hugetlbpage.c	2007-03-22 15:12:39.000000000 +1100
@@ -148,6 +148,14 @@ unsigned long hugetlb_get_unmapped_area(
 		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;
 
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