From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Subject: Re: [4.1.2-rt1] build failure
Date: Mon, 20 Jul 2015 17:38:03 +0200
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Cc: linux-rt-users@vger.kernel.org, Sekhar Nori <nsekhar@ti.com>
To: Grygorii Strashko <grygorii.strashko@ti.com>
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* Grygorii Strashko | 2015-07-17 19:47:30 [+0300]:

>  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);
>   ^
this is one of the patches I've thrown away because it looked not
needed. On vanilla this header gets sucked in via
include/linux/spinlock.h but on -RT we don't need it and we get this.

>The below diff fixes an issue for me:
>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
> {

If you manage so send me this as  a proper patch then I could include it
into the patchset.

Sebastian