linux-kernel - Re: [PATCH 02/19] context_tracking: Rename context_tracking_user_enter/exit() to user_enter/exit

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Date:   Sat, 5 Mar 2022 14:59:40 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>, Phil Auld <pauld@...hat.com>,
        Alex Belits <abelits@...vell.com>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Xiongfeng Wang <wangxiongfeng2@...wei.com>,
        Neeraj Upadhyay <quic_neeraju@...cinc.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Yu Liao <liaoyu15@...wei.com>,
        Boqun Feng <boqun.feng@...il.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Marcelo Tosatti <mtosatti@...hat.com>,
        Paul Gortmaker <paul.gortmaker@...driver.com>,
        Uladzislau Rezki <uladzislau.rezki@...y.com>,
        Joel Fernandes <joel@...lfernandes.org>
Subject: Re: [PATCH 02/19] context_tracking: Rename
 context_tracking_user_enter/exit() to user_enter/exit_callable()

On Wed, Mar 02, 2022 at 04:47:53PM +0100, Frederic Weisbecker wrote:
> diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
> index ad2a973393a6..83e050675b23 100644
> --- a/kernel/context_tracking.c
> +++ b/kernel/context_tracking.c
> @@ -125,11 +125,16 @@ void context_tracking_enter(enum ctx_state state)
>  NOKPROBE_SYMBOL(context_tracking_enter);
>  EXPORT_SYMBOL_GPL(context_tracking_enter);
>  
> -void context_tracking_user_enter(void)
> +/**
> + * user_enter_callable() - Unfortunate ASM callable version of user_enter() for
> + * 			   archs that didn't manage to check the context tracking
> + * 			   static key from low level code.
> + */
> +void user_enter_callable(void)
>  {
>  	user_enter();
>  }
> -NOKPROBE_SYMBOL(context_tracking_user_enter);
> +NOKPROBE_SYMBOL(user_enter_callable);
>  
>  /**
>   * __ct_user_exit - Inform the context tracking that the CPU is
> @@ -182,11 +187,16 @@ void context_tracking_exit(enum ctx_state state)
>  NOKPROBE_SYMBOL(context_tracking_exit);
>  EXPORT_SYMBOL_GPL(context_tracking_exit);
>  
> -void context_tracking_user_exit(void)
> +/**
> + * user_exit_callable() - Unfortunate ASM callable version of user_exit() for
> + * 			  archs that didn't manage to check the context tracking
> + * 			  static key from low level code.
> + */
> +void user_exit_callable(void)
>  {
>  	user_exit();
>  }
> -NOKPROBE_SYMBOL(context_tracking_user_exit);
> +NOKPROBE_SYMBOL(user_exit_callable);

I'm thinking all this wants to be noinstr instead of NOKPROBE_SYMBOL..