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authorDavid Howells <dhowells@redhat.com>2010-01-15 17:01:32 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2010-01-16 12:15:39 -0800
commited5e5894b234ce4793d78078c026915b853e0678 (patch)
tree199db2a5cc821d4de9645418fb00c03d438eae1f /ipc/shm.c
parent8ff410daa009c4b44be445ded5b0cec00abc0426 (diff)
downloadlinux-linaro-stable-ed5e5894b234ce4793d78078c026915b853e0678.tar.gz
nommu: fix SYSV SHM for NOMMU
Commit c4caa778157dbbf04116f0ac2111e389b5cd7a29 ("file ->get_unmapped_area() shouldn't duplicate work of get_unmapped_area()") 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@redhat.com> Acked-by: Al Viro <viro@zeniv.linux.org.uk> Cc: Greg Ungerer <gerg@snapgear.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'ipc/shm.c')
-rw-r--r--ipc/shm.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/ipc/shm.c b/ipc/shm.c
index 92fe9236258b..23256b855819 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 = {