linux-kernel - [4.1.2-rt1 PATCH] include/linux/pid.h: fix build error

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Date:	Fri, 15 Jan 2016 16:14:15 +0200
From:	Grygorii Strashko <grygorii.strashko@...com>
To:	<bigeasy@...utronix.de>,
	Russell King <rmk+kernel@....linux.org.uk>,
	<linux-rt-users@...r.kernel.org>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	Sekhar Nori <nsekhar@...com>,
	Grygorii Strashko <Grygorii.Strashko@...aro.org>
Subject: [4.1.2-rt1 PATCH] include/linux/pid.h: fix build error

From: Grygorii Strashko <Grygorii.Strashko@...aro.org>

This patch fixes build error:
  CC      kernel/pid_namespace.o
In file included from kernel/pid_namespace.c:11:0:
include/linux/pid.h: In function 'get_pid':
include/linux/pid.h:78:3: error: implicit declaration of function 'atomic_inc' [-Werror=implicit-function-declaration]
   atomic_inc(&pid->count);
   ^
which happens when
 CONFIG_PROVE_LOCKING=n
 CONFIG_DEBUG_SPINLOCK=n
 CONFIG_DEBUG_MUTEXES=n
 CONFIG_DEBUG_LOCK_ALLOC=n

Signed-off-by: Grygorii Strashko <Grygorii.Strashko@...aro.org>
---
 include/linux/pid.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/pid.h b/include/linux/pid.h
index 23705a53..2cc64b7 100644
--- a/include/linux/pid.h
+++ b/include/linux/pid.h
@@ -2,6 +2,7 @@
 #define _LINUX_PID_H
 
 #include <linux/rcupdate.h>
+#include <linux/atomic.h>
 
 enum pid_type
 {
-- 
2.4.6