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From: David Howells on 14 Jan 2010 09:10
Commit c4caa778157dbbf04116f0ac2111e389b5cd7a29 broke SYSV SHM for NOMMU by
taking away the pointer to shm_get_unmapped_area() from shm_file_operations.

Put it back conditionally on CONFIG_MMU=n.

file->f_ops->get_unmapped_area() is used to find out the base address for a
mapping of a mappable chardev device or mappable memory-based file (such as a
ramfs file). It needs to be called prior to file->f_ops->mmap() being called.

Signed-off-by: David Howells <dhowells(a)redhat.com>
Acked-by: Al Viro <viro(a)zeniv.linux.org.uk>
---

ipc/shm.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)


diff --git a/ipc/shm.c b/ipc/shm.c
index 92fe923..23256b8 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -298,6 +298,9 @@ static const struct file_operations shm_file_operations = {
.mmap = shm_mmap,
.fsync = shm_fsync,
.release = shm_release,
+#ifndef CONFIG_MMU
+ .get_unmapped_area = shm_get_unmapped_area,
+#endif
};

static const struct file_operations shm_file_operations_huge = {

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