linux-kernel - Re: [PATCH 05/19] x86/dumpstack: fix function graph tracing stack dump reliability issues

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Message-ID: <20160802231857.4c082831@grimm.local.home>
Date:	Tue, 2 Aug 2016 23:18:57 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...nel.org>,
	"H . Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Brian Gerst <brgerst@...il.com>,
	Kees Cook <keescook@...omium.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Byungchul Park <byungchul.park@....com>
Subject: Re: [PATCH 05/19] x86/dumpstack: fix function graph tracing stack
 dump reliability issues

On Tue, 2 Aug 2016 22:12:33 -0500
Josh Poimboeuf <jpoimboe@...hat.com> wrote:


> Sounds good.  I was thinking I could also add a similar define to
> indicate whether an arch passes the return address stack pointer to
> ftrace_push_return_trace().  HAVE_FUNCTION_GRAPH_RET_ADDR_PTR?
> 

If you are making this function global, might as well make all pass
that pointer when you do the conversion. I don't think we need a define
to differentiate it.

-- Steve