3.0-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Linus Torvalds <torvalds@linux-foundation.org>

commit 3c761ea05a8900a907f32b628611873f6bef24b2 upstream.

The autofs compat handling fix caused a compile failure when
CONFIG_COMPAT isn't defined.

Instead of adding random #ifdef'fery in autofs, let's just make the
compat helpers earlier to use: without CONFIG_COMPAT, is_compat_task()
just hardcodes to zero.

We could probably do something similar for a number of other cases where
we have #ifdef's in code, but this is the low-hanging fruit.

Reported-and-tested-by: Andreas Schwab <redacted>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Jonathan Nieder <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 include/linux/compat.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/include/linux/compat.h
+++ b/include/linux/compat.h

@@ -561,5 +561,9 @@ extern ssize_t compat_rw_copy_check_uvec
 
 extern void __user *compat_alloc_user_space(unsigned long len);
 
+#else
+
+#define is_compat_task() (0)
+
 #endif /* CONFIG_COMPAT */
 #endif /* _LINUX_COMPAT_H */