linux-kernel - Re: [PATCH 09/12] powerpc/ftrace: Use generic ftrace_modify_all

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Message-ID: <56CE5469.6050804@gmail.com>
Date:	Thu, 25 Feb 2016 12:10:01 +1100
From:	Balbir Singh <bsingharora@...il.com>
To:	Michael Ellerman <mpe@...erman.id.au>, linuxppc-dev@...abs.org
Cc:	duwe@....de, linux-kernel@...r.kernel.org, rostedt@...dmis.org,
	kamalesh@...ux.vnet.ibm.com, pmladek@...e.com, jeyu@...hat.com,
	jkosina@...e.cz, live-patching@...r.kernel.org, mbenes@...e.cz
Subject: Re: [PATCH 09/12] powerpc/ftrace: Use generic
 ftrace_modify_all_code()



On 25/02/16 01:28, Michael Ellerman wrote:
> From: Torsten Duwe <duwe@....de>
>
> Convert powerpc's arch_ftrace_update_code() from its own version to use
> the generic default functionality (without stop_machine -- our
> instructions are properly aligned and the replacements atomic).
>
> With this we gain error checking and the much-needed function_trace_op
> handling.
>
> Signed-off-by: Torsten Duwe <duwe@...e.de>
> Signed-off-by: Michael Ellerman <mpe@...erman.id.au>
> ---
>  arch/powerpc/kernel/ftrace.c | 17 +++++------------
>  1 file changed, 5 insertions(+), 12 deletions(-)
>
> diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
> index c6408a399ac6..56e5bd53c323 100644
> --- a/arch/powerpc/kernel/ftrace.c
> +++ b/arch/powerpc/kernel/ftrace.c
> @@ -527,20 +527,13 @@ void ftrace_replace_code(int enable)
>  	}
>  }
>  
> +/*
> + * Use the default ftrace_modify_all_code, but without
> + * stop_machine().
> + */
>  void arch_ftrace_update_code(int command)
>  {
> -	if (command & FTRACE_UPDATE_CALLS)
> -		ftrace_replace_code(1);
> -	else if (command & FTRACE_DISABLE_CALLS)
> -		ftrace_replace_code(0);
> -
> -	if (command & FTRACE_UPDATE_TRACE_FUNC)
> -		ftrace_update_ftrace_func(ftrace_trace_function);
> -
> -	if (command & FTRACE_START_FUNC_RET)
> -		ftrace_enable_ftrace_graph_caller();
> -	else if (command & FTRACE_STOP_FUNC_RET)
> -		ftrace_disable_ftrace_graph_caller();
> +	ftrace_modify_all_code(command);
>  }
>  
>  int __init ftrace_dyn_arch_init(void)
Reviewed-by: Balbir Singh <bsingharora@...il.com>

Balbir