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

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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>
This commit is contained in:
David Howells 2007-03-22 00:11:23 -08:00 committed by Linus Torvalds
parent 8da38d7bac
commit d56e03cd27
1 changed files with 22 additions and 0 deletions
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22
mm/nommu.c
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@ -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