linux-kernel - Re: Re: [RFC][PATCH 2/4 v4] ftrace/x86: Add save

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Date:	Thu, 19 Jul 2012 14:24:52 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Uros Bizjak <ubizjak@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, yrl.pp-manager.tt@...achi.com
Subject: Re: Re: [RFC][PATCH 2/4 v4] ftrace/x86: Add save_regs for i386
 function calls

On Thu, 2012-07-19 at 08:52 -0400, Steven Rostedt wrote:
> On Thu, 2012-07-19 at 11:20 +0900, Masami Hiramatsu wrote:
> > (2012/07/19 0:59), Steven Rostedt wrote:
> > > On Fri, 2012-07-13 at 14:47 -0400, Steven Rostedt wrote:
> > > 
> > > Masami, can you give your Reviewed-by tag for this version? Or is there
> > > something else needing to be fixed?
> > 
> > No, that is OK for me. I've just missed that...
> > 
> > Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> > 
> > Thank you!
> > 
> 
> Thanks! Except I have one more version. Someone offlist gave me some
> ideas.
> 
> Here's the diff from the previous patch.
> 
> diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S
> index 46caa56..ca5a146 100644
> --- a/arch/x86/kernel/entry_32.S
> +++ b/arch/x86/kernel/entry_32.S
> @@ -1169,10 +1169,9 @@ ENTRY(ftrace_regs_caller)
>  	movl $__KERNEL_CS,13*4(%esp)
>  
>  	movl 12*4(%esp), %eax	/* Load ip (1st parameter) */
> -	movl 0x4(%ebp), %edx	/* Load parent ip (2cd parameter) */
> -	lea  (%esp), %ecx
> -	pushl %ecx		/* Save pt_regs as 4th parameter */
> +	movl 0x4(%ebp), %edx	/* Load parent ip (2nd parameter) */
>  	leal function_trace_op, %ecx /* Save ftrace_pos in 3rd parameter */
> +	pushl %esp		/* Save pt_regs as 4th parameter */
>  
>  GLOBAL(ftrace_regs_call)

I'm adding this as a separate patch under Uros's name.

I'll be posting the full series for pulling either tonight or tomorrow,
depending on how it handles all my stress tests.

-- Steve


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