linux-kernel - Re: [PATCH] tracing/kprobes: Do the notrace functions check without kprobes on ftrace

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Date:   Wed, 6 Jan 2021 09:56:14 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tracing/kprobes: Do the notrace functions check without
 kprobes on ftrace

On Wed,  6 Jan 2021 12:20:40 +0900
Masami Hiramatsu <mhiramat@...nel.org> wrote:

> Enable the notrace function check on the architecture which doesn't
> support kprobes on ftrace. This notrace function check is not only
> for the kprobes on ftrace but also sw-breakpoint based kprobes.
> Thus there is no reason to limit this check for the arch which
> supports kprobes on ftrace.
> 
> This also changes the dependency of Kconfig. Because kprobe event
> uses the function tracer's address list for identifying notrace
> function, if the CONFIG_FUNCTION_TRACER=n, it can not check whether
> the target function is notrace or not.
> 
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> Acked-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> ---
>  

Thanks Masami,

I queued this up for testing, and will mark it for stable. I know it's a
minor fix, but it also shouldn't have much risk either.

-- Steve