linux-kernel - Re: [PATCH 1/7] tracing: Add syscall tracepoints

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Date:	Thu, 27 Aug 2009 19:50:02 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>,
	Jason Baron <jbaron@...hat.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Jiaying Zhang <jiayingz@...gle.com>,
	Martin Bligh <mbligh@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Martin Schwidefsky <schwidefsky@...ibm.com>,
	Paul Mundt <lethal@...ux-sh.org>
Subject: Re: [PATCH 1/7] tracing: Add syscall tracepoints - s390 arch update

Oh, I forgot to put the
Acked-by: Heiko Carstens <heiko.carstens@...ibm.com> on this one.

Sorry...


On Thu, Aug 27, 2009 at 07:43:29PM +0200, Frederic Weisbecker wrote:
> From: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
> 
> This patch includes s390 arch updates to synchronize with latest
> core changes in the syscalls tracing area.
> 
> - tracing: Map syscall name to number (syscall_name_to_nr())
> - tracing: Call arch_init_ftrace_syscalls at boot
> - tracing: add support tracepoint ids (set_syscall_{enter,exit}_id())
> 
> Signed-off-by: Hendrik Brueckner <brueckner@...ux.vnet.ibm.com>
> Cc: Jason Baron <jbaron@...hat.com>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Ingo Molnar <mingo@...e.hu>
> Cc: Lai Jiangshan <laijs@...fujitsu.com>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> Cc: Jiaying Zhang <jiayingz@...gle.com>
> Cc: Martin Bligh <mbligh@...gle.com>
> Cc: Li Zefan <lizf@...fujitsu.com>
> Cc: Martin Schwidefsky <schwidefsky@...ibm.com>
> Cc: Paul Mundt <lethal@...ux-sh.org>
> LKML-Reference: <20090825123111.GD4639@...us.boeblingen.de.ibm.com>
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> ---
>  arch/s390/kernel/ftrace.c |   36 +++++++++++++++++++++++++++---------
>  1 files changed, 27 insertions(+), 9 deletions(-)
> 
> diff --git a/arch/s390/kernel/ftrace.c b/arch/s390/kernel/ftrace.c
> index 3e298e6..57bdcb1 100644
> --- a/arch/s390/kernel/ftrace.c
> +++ b/arch/s390/kernel/ftrace.c
> @@ -220,6 +220,29 @@ struct syscall_metadata *syscall_nr_to_meta(int nr)
>  	return syscalls_metadata[nr];
>  }
>  
> +int syscall_name_to_nr(char *name)
> +{
> +	int i;
> +
> +	if (!syscalls_metadata)
> +		return -1;
> +	for (i = 0; i < NR_syscalls; i++)
> +		if (syscalls_metadata[i])
> +			if (!strcmp(syscalls_metadata[i]->name, name))
> +				return i;
> +	return -1;
> +}
> +
> +void set_syscall_enter_id(int num, int id)
> +{
> +	syscalls_metadata[num]->enter_id = id;
> +}
> +
> +void set_syscall_exit_id(int num, int id)
> +{
> +	syscalls_metadata[num]->exit_id = id;
> +}
> +
>  static struct syscall_metadata *find_syscall_meta(unsigned long syscall)
>  {
>  	struct syscall_metadata *start;
> @@ -237,24 +260,19 @@ static struct syscall_metadata *find_syscall_meta(unsigned long syscall)
>  	return NULL;
>  }
>  
> -void arch_init_ftrace_syscalls(void)
> +static int __init arch_init_ftrace_syscalls(void)
>  {
>  	struct syscall_metadata *meta;
>  	int i;
> -	static atomic_t refs;
> -
> -	if (atomic_inc_return(&refs) != 1)
> -		goto out;
>  	syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) * NR_syscalls,
>  				    GFP_KERNEL);
>  	if (!syscalls_metadata)
> -		goto out;
> +		return -ENOMEM;
>  	for (i = 0; i < NR_syscalls; i++) {
>  		meta = find_syscall_meta((unsigned long)sys_call_table[i]);
>  		syscalls_metadata[i] = meta;
>  	}
> -	return;
> -out:
> -	atomic_dec(&refs);
> +	return 0;
>  }
> +arch_initcall(arch_init_ftrace_syscalls);
>  #endif
> -- 
> 1.6.2.3
> 

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