linux-kernel - Re: [for-next][PATCH 05/30] arm64: function_graph: Remove use of FTRACE_NOTRACE

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Date:   Thu, 6 Dec 2018 10:55:41 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Will Deacon <will.deacon@....com>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Tom Zanussi <zanussi@...nel.org>,
        Ravi Bangoria <ravi.bangoria@...ux.vnet.ibm.com>,
        Catalin Marinas <catalin.marinas@....com>,
        linux-arm-kernel@...ts.infradead.org,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>
Subject: Re: [for-next][PATCH 05/30] arm64: function_graph: Remove use of
 FTRACE_NOTRACE_DEPTH

On Thu, 6 Dec 2018 15:49:32 +0000
Will Deacon <will.deacon@....com> wrote:

> On Wed, Dec 05, 2018 at 06:47:54PM -0500, Steven Rostedt wrote:
> > From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> > 
> > Functions in the set_graph_notrace no longer subtract FTRACE_NOTRACE_DEPTH
> > from curr_ret_stack, as that is now implemented via the trace_recursion
> > flags. Access to curr_ret_stack no longer needs to worry about checking for
> > this. curr_ret_stack is still initialized to -1, when there's not a shadow
> > stack allocated.
> > 
> > Cc: Catalin Marinas <catalin.marinas@....com>
> > Cc: Will Deacon <will.deacon@....com>
> > Cc: linux-arm-kernel@...ts.infradead.org
> > Reviewed-by: Joel Fernandes (Google) <joel@...lfernandes.org>
> > Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> > ---
> >  arch/arm64/kernel/stacktrace.c | 3 ---
> >  1 file changed, 3 deletions(-)
> > 
> > diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
> > index 4989f7ea1e59..7723dadf25be 100644
> > --- a/arch/arm64/kernel/stacktrace.c
> > +++ b/arch/arm64/kernel/stacktrace.c
> > @@ -61,9 +61,6 @@ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame)
> >  			(frame->pc == (unsigned long)return_to_handler)) {
> >  		if (WARN_ON_ONCE(frame->graph == -1))
> >  			return -EINVAL;
> > -		if (frame->graph < -1)
> > -			frame->graph += FTRACE_NOTRACE_DEPTH;
> > -  
> 
> Acked-by: Will Deacon <will.deacon@....com>
> 

Thanks Will!

-- Steve