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

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Date:   Tue, 24 Jul 2018 13:07:13 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Eric Biggers <ebiggers@...gle.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: [PATCH] eventfs: include linux/errno.h in header

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@...db.de>
---
 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