linux-kernel - Re: [PATCH] signals: move trace header #include to after all others.

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Date:	Thu, 18 Aug 2011 09:57:17 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Ian Campbell <ian.campbell@...rix.com>
Cc:	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] signals: move trace header #include to after all
 others.

On Thu, 2011-08-18 at 14:46 +0100, Ian Campbell wrote:
> Steven Rostedt says:
>     The trace events headers are suppose to be the last headers
>     included.
> and this fixes a build error when another header already includes trace stuff,
> which I saw when adding a highmem.h include to skbuff.h e.g.:
> In file included from include/trace/ftrace.h:296:0,
>                  from include/trace/define_trace.h:96,
>                  from include/trace/events/irq.h:150,
>                  from include/linux/interrupt.h:23,
>                  from arch/x86/include/asm/highmem.h:23,
>                  from include/linux/highmem.h:33,
>                  from include/linux/skbuff.h:32,
>                  from kernel/audit.h:24,
>                  from kernel/signal.c:38:
> include/trace/events/irq.h: In function 'ftrace_raw_output_softirq':
> include/trace/events/irq.h:87:1: error: 'HI_SOFTIRQ' undeclared (first use in this function)
> include/trace/events/irq.h:87:1: note: each undeclared identifier is reported only once for each function it appears in
> include/trace/events/irq.h:87:1: error: 'TIMER_SOFTIRQ' undeclared (first use in this function)
> include/trace/events/irq.h:87:1: error: 'NET_TX_SOFTIRQ' undeclared (first use in this function)
> include/trace/events/irq.h:87:1: error: 'NET_RX_SOFTIRQ' undeclared (first use in this function)
> include/trace/events/irq.h:87:1: error: 'BLOCK_SOFTIRQ' undeclared (first use in this function)
> include/trace/events/irq.h:87:1: error: 'BLOCK_IOPOLL_SOFTIRQ' undeclared (first use in this function)
> include/trace/events/irq.h:87:1: error: 'TASKLET_SOFTIRQ' undeclared (first use in this function)
> include/trace/events/irq.h:87:1: error: 'SCHED_SOFTIRQ' undeclared (first use in this function)
> include/trace/events/irq.h:87:1: error: 'HRTIMER_SOFTIRQ' undeclared (first use in this function)
> include/trace/events/irq.h:87:1: error: 'RCU_SOFTIRQ' undeclared (first use in this function)
> 
> See http://lkml.kernel.org/r/1313668307.5010.300.camel@zakaz.uk.xensource.com
> 
> Signed-off-by: Ian Campbell <ian.campbell@...rix.com>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...hat.com>

Acked-by: Steven Rostedt <rostedt@...dmis.org>

-- Steve

> ---
>  kernel/signal.c |    5 +++--
>  1 files changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/signal.c b/kernel/signal.c
> index 291c970..d3cd4e7 100644
> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -28,8 +28,6 @@
>  #include <linux/freezer.h>
>  #include <linux/pid_namespace.h>
>  #include <linux/nsproxy.h>
> -#define CREATE_TRACE_POINTS
> -#include <trace/events/signal.h>
>  
>  #include <asm/param.h>
>  #include <asm/uaccess.h>
> @@ -37,6 +35,9 @@
>  #include <asm/siginfo.h>
>  #include "audit.h"	/* audit_signal_info() */
>  
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/signal.h>
> +
>  /*
>   * SLAB caches for signal bits.
>   */


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