[PATCH] NOMMU: Document NOMMU support for futexes

[David Howells <dhowells@redhat.com>]

From: David Howells <dhowells@redhat.com>

Document the fact that NOMMU now supports futexes.

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

 Documentation/nommu-mmap.txt |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/Documentation/nommu-mmap.txt b/Documentation/nommu-mmap.txt
index 4db7c18..7714f57 100644
--- a/Documentation/nommu-mmap.txt
+++ b/Documentation/nommu-mmap.txt
@@ -138,6 +138,16 @@ mode.  The former through the usual mech
 on ramfs or tmpfs mounts.
 
 
+=======
+FUTEXES
+=======
+
+Futexes are supported in NOMMU mode if the arch supports them.  An error will
+be given if an address passed to the futex system call lies outside the
+mappings made by a process or if the mapping in which the address lies does not
+support futexes (such as an I/O chardev mapping).
+
+
 =============
 NO-MMU MREMAP
 =============
-
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