From: David Howells <dhowells@redhat.com>
Date: Thu, 22 Mar 2007 08:11:23 +0000 (-0800)
Subject: [PATCH] NOMMU: supply get_unmapped_area() to fix NOMMU SYSV SHM
X-Git-Tag: v2.6.21-rc5~38
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d56e03cd275486eb8141116a7af2df7457cb0115;p=linux-2.6

[PATCH] NOMMU: supply get_unmapped_area() to fix NOMMU SYSV SHM

Supply a get_unmapped_area() to fix NOMMU SYSV SHM support.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Adam Litke <agl@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/mm/nommu.c b/mm/nommu.c
index 23fb033e59..ba6df4d299 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1192,6 +1192,28 @@ void unmap_mapping_range(struct address_space *mapping,
 }
 EXPORT_SYMBOL(unmap_mapping_range);
 
+/*
+ * ask for an unmapped area at which to create a mapping on a file
+ */
+unsigned long get_unmapped_area(struct file *file, unsigned long addr,
+				unsigned long len, unsigned long pgoff,
+				unsigned long flags)
+{
+	unsigned long (*get_area)(struct file *, unsigned long, unsigned long,
+				  unsigned long, unsigned long);
+
+	get_area = current->mm->get_unmapped_area;
+	if (file && file->f_op && file->f_op->get_unmapped_area)
+		get_area = file->f_op->get_unmapped_area;
+
+	if (!get_area)
+		return -ENOSYS;
+
+	return get_area(file, addr, len, pgoff, flags);
+}
+
+EXPORT_SYMBOL(get_unmapped_area);
+
 /*
  * Check that a process has enough memory to allocate a new virtual
  * mapping. 0 means there is enough memory for the allocation to