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Subject[PATCH] NOMMU: Supply get_unmapped_area() to fix NOMMU SYSV SHM
Date
From: David Howells <dhowells@redhat.com>

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

Signed-Off-By: David Howells <dhowells@redhat.com>
---

mm/nommu.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/mm/nommu.c b/mm/nommu.c
index 23fb033..ba6df4d 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1193,6 +1193,28 @@ 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
* succeed and -ENOMEM implies there is not.
-
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