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

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Message-ID: <20181206154931.GA4327@arm.com>
Date:   Thu, 6 Dec 2018 15:49:32 +0000
From:   Will Deacon <will.deacon@....com>
To:     Steven Rostedt <rostedt@...dmis.org>
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 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>

Will