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Date: Thu, 09 Feb 2012 08:14:56 -0800
From: Randy Dunlap <rdunlap@...otime.net>
To: "Myklebust, Trond" <Trond.Myklebust@...app.com>
CC: Steven Rostedt <rostedt@...dmis.org>,
Stephen Rothwell <sfr@...b.auug.org.au>,
"linux-next@...r.kernel.org" <linux-next@...r.kernel.org>,
LKML <linux-kernel@...r.kernel.org>,
Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: linux-next: Tree for Feb 2 (trace/events/sunrpc.h)
On 02/08/2012 07:14 PM, Myklebust, Trond wrote:
> On Wed, 2012-02-08 at 21:37 -0500, Steven Rostedt wrote:
>> [ Added the person responsible for this ]
>>
>> On Thu, 2012-02-02 at 10:10 -0800, Randy Dunlap wrote:
>>> On 02/01/2012 07:45 PM, Stephen Rothwell wrote:
>>>> Hi all,
>>>>
>>>> Changes since 20120201:
>>>
>>>
>>>
>>> include/trace/events/sunrpc.h:69:1: error: implicit declaration of function 'rpc_qname'
>>> include/trace/events/sunrpc.h:69:1: warning: format '%s' expects type 'char *', but argument 9 has type 'int'
>>
>> This has actually nothing to do with the tracepoint itself. The bug is
>> with the rpc_qname().
>>
>> The tracepoint references rpc_qname() and in
>> include/linux/sunrpc/sched.h:
>>
>>
>> #ifdef RPC_DEBUG
>> static inline const char * rpc_qname(const struct rpc_wait_queue *q)
>> {
>> return ((q && q->name) ? q->name : "unknown");
>> }
>> #endif
>>
>> Your config had RPC_DEBUG not set, thus the function was not defined.
>>
>>
>> The below patch fixes the problem with the side effect that the trace
>> data will contain "unknown" for all references to rcu_qname().
>>
>> -- Steve
>>
>> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
>>
>>
>> diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
>> index f7b2df5..c89ba95 100644
>> --- a/include/linux/sunrpc/sched.h
>> +++ b/include/linux/sunrpc/sched.h
>> @@ -275,6 +275,11 @@ static inline const char * rpc_qname(const struct rpc_wait_queue *q)
>> {
>> return ((q && q->name) ? q->name : "unknown");
>> }
>> +#else
>> +static inline const char * rpc_qname(const struct rpc_wait_queue *q)
>> +{
>> + return "unknown";
>> +}
>> #endif
>>
>> #endif /* _LINUX_SUNRPC_SCHED_H_ */
>
> Hmm.... How about if we rather take that out of the RPC_DEBUG condition?
> I'm assuming that if someone compiles in the tracepoint code, then they
> want to be able to do a full trace independently of whether or not they
> set CONFIG_SYSCTL.
>
> 8<---------------------------------------------------------------------
> From d051b60dcc3032b71cf8d9b96ac4bf24f12b6dcb Mon Sep 17 00:00:00 2001
> From: Trond Myklebust <Trond.Myklebust@...app.com>
> Date: Wed, 8 Feb 2012 22:01:15 -0500
> Subject: [PATCH] SUNRPC: Ensure that we can trace waitqueues when
> !defined(CONFIG_SYSCTL)
>
> The tracepoint code relies on the queue->name being defined in order to
> be able to display the name of the waitqueue on which an RPC task is
> sleeping.
>
> Reported-by: Randy Dunlap <rdunlap@...otime.net>
> Reported-by: Steven Rostedt <rostedt@...dmis.org>
> Signed-off-by: Trond Myklebust <Trond.Myklebust@...app.com>
Acked-by: Randy Dunlap <rdunlap@...otime.net>
Thanks.
> ---
> include/linux/sunrpc/debug.h | 3 +++
> include/linux/sunrpc/sched.h | 15 +++++++++++++--
> net/sunrpc/sched.c | 4 +---
> 3 files changed, 17 insertions(+), 5 deletions(-)
>
> diff --git a/include/linux/sunrpc/debug.h b/include/linux/sunrpc/debug.h
> index c2786f2..2a11eb2 100644
> --- a/include/linux/sunrpc/debug.h
> +++ b/include/linux/sunrpc/debug.h
> @@ -34,6 +34,9 @@
> #ifdef CONFIG_SYSCTL
> #define RPC_DEBUG
> #endif
> +#ifdef CONFIG_TRACEPOINTS
> +#define RPC_TRACEPOINTS
> +#endif
> /* #define RPC_PROFILE */
>
> /*
> diff --git a/include/linux/sunrpc/sched.h b/include/linux/sunrpc/sched.h
> index f7b2df5..22dfc24 100644
> --- a/include/linux/sunrpc/sched.h
> +++ b/include/linux/sunrpc/sched.h
> @@ -195,7 +195,7 @@ struct rpc_wait_queue {
> unsigned char nr; /* # tasks remaining for cookie */
> unsigned short qlen; /* total # tasks waiting in queue */
> struct rpc_timer timer_list;
> -#ifdef RPC_DEBUG
> +#if defined(RPC_DEBUG) || defined(RPC_TRACEPOINTS)
> const char * name;
> #endif
> };
> @@ -270,11 +270,22 @@ static inline int rpc_task_has_priority(struct rpc_task *task, unsigned char pri
> return (task->tk_priority + RPC_PRIORITY_LOW == prio);
> }
>
> -#ifdef RPC_DEBUG
> +#if defined(RPC_DEBUG) || defined (RPC_TRACEPOINTS)
> static inline const char * rpc_qname(const struct rpc_wait_queue *q)
> {
> return ((q && q->name) ? q->name : "unknown");
> }
> +
> +static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
> + const char *name)
> +{
> + q->name = name;
> +}
> +#else
> +static inline void rpc_assign_waitqueue_name(struct rpc_wait_queue *q,
> + const char *name)
> +{
> +}
> #endif
>
> #endif /* _LINUX_SUNRPC_SCHED_H_ */
> diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c
> index d79c63d..1c570a8 100644
> --- a/net/sunrpc/sched.c
> +++ b/net/sunrpc/sched.c
> @@ -208,9 +208,7 @@ static void __rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const c
> queue->qlen = 0;
> setup_timer(&queue->timer_list.timer, __rpc_queue_timer_fn, (unsigned long)queue);
> INIT_LIST_HEAD(&queue->timer_list.list);
> -#ifdef RPC_DEBUG
> - queue->name = qname;
> -#endif
> + rpc_assign_waitqueue_name(queue, qname);
> }
>
> void rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const char *qname)
--
~Randy
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