linux-kernel - Re: [PATCH v4 05/27] x86: Replace ist_enter() with nmi

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Date:   Wed, 26 Feb 2020 14:16:06 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Andy Lutomirski <luto@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Greg KH <gregkh@...uxfoundation.org>, gustavo@...eddedor.com,
        Thomas Gleixner <tglx@...utronix.de>, paulmck@...nel.org,
        Josh Triplett <josh@...htriplett.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Tony Luck <tony.luck@...el.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        Masami Hiramatsu <mhiramat@...nel.org>
Subject: Re: [PATCH v4 05/27] x86: Replace ist_enter() with nmi_enter()

On Wed, Feb 26, 2020 at 11:25:09AM +0100, Peter Zijlstra wrote:
> Subject: sh/ftrace: Move arch_ftrace_nmi_{enter,exit} into nmi exception
> From: Peter Zijlstra <peterz@...radead.org>
> Date: Mon Feb 24 22:26:21 CET 2020
> 
> SuperH is the last remaining user of arch_ftrace_nmi_{enter,exit}(),
> remove it from the generic code and into the SuperH code.
> 
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> ---

> --- a/arch/sh/kernel/traps.c
> +++ b/arch/sh/kernel/traps.c
> @@ -170,11 +170,21 @@ BUILD_TRAP_HANDLER(bug)
>  	force_sig(SIGTRAP);
>  }
>  
> +#ifdef CONFIG_HAVE_DYNAMIC_FTRACE

build robot just informed me that this ought to s/HAVE_//

> +extern void arch_ftrace_nmi_enter(void);
> +extern void arch_ftrace_nmi_exit(void);
> +#else
> +static inline void arch_ftrace_nmi_enter(void) { }
> +static inline void arch_ftrace_nmi_exit(void) { }
> +#endif