[PATCH] eventfs: include linux/errno.h in header

[Arnd Bergmann]

The new gasket staging driver ran into a randconfig build failure when
CONFIG_EVENTFD is disabled:

In file included from drivers/staging/gasket/gasket_interrupt.h:11,
                 from drivers/staging/gasket/gasket_interrupt.c:4:
include/linux/eventfd.h: In function 'eventfd_ctx_fdget':
include/linux/eventfd.h:51:9: error: implicit declaration of function 'ERR_PTR' [-Werror=implicit-function-declaration]

I can't see anything wrong with including eventfd.h before err.h,
so the easiest fix is to make it possible to do this by including the
file where it is needed.

Fixes: 9a69f5087ccc ("drivers/staging: Gasket driver framework + Apex driver")
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 include/linux/eventfd.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/eventfd.h b/include/linux/eventfd.h
index 7094718b653b..ffcc7724ca21 100644
--- a/include/linux/eventfd.h
+++ b/include/linux/eventfd.h
@@ -11,6 +11,7 @@
 
 #include <linux/fcntl.h>
 #include <linux/wait.h>
+#include <linux/err.h>
 
 /*
  * CAREFUL: Check include/uapi/asm-generic/fcntl.h when defining
-- 
2.18.0