linux-kernel - Re: [PATCH -tip v2 3/9] ftrace/x86: Support SAVE

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Date:	Tue, 05 Jun 2012 14:51:18 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	yrl.pp-manager.tt@...achi.com
Subject: Re: [PATCH -tip v2 3/9] ftrace/x86: Support SAVE_REGS feature on i386

Masami Hiramatsu <masami.hiramatsu.pt@...achi.com> writes:
>  
> +	.macro FTRACE_SAVE_ALL
> +	/* eflags is saved on cs */
> +	subl $8, %esp		/* skip ip and orig_ax */
> +	pushl %gs
> +	pushl %fs

For pure in kernel use you don't need to save/restore fs/gs
This is only needed on kernel/user space boundaries.

And for this usage probably also not flags


-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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