linux-kernel - Re: [PATCH 01/19] context_tracking: Rename __context_tracking_enter/exit() to __ct_user

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Date:   Thu, 10 Mar 2022 11:27:57 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Frederic Weisbecker <frederic@...nel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <peterz@...radead.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>,
        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 01/19] context_tracking: Rename
 __context_tracking_enter/exit() to __ct_user_enter/exit()

On Wed, Mar 02, 2022 at 04:47:52PM +0100, Frederic Weisbecker wrote:
> The context tracking namespace is going to expand and some new functions
> will require even longer names. Start shrinking the context_tracking
> prefix to "ct" as is already the case for some existing macros, this
> will make the introduction of new functions easier.
> 
> Signed-off-by: Frederic Weisbecker <frederic@...nel.org>

Acked-by: Paul E. McKenney <paulmck@...nel.org>

> Cc: Paul E. McKenney <paulmck@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Neeraj Upadhyay <quic_neeraju@...cinc.com>
> Cc: Uladzislau Rezki <uladzislau.rezki@...y.com>
> Cc: Joel Fernandes <joel@...lfernandes.org>
> Cc: Boqun Feng <boqun.feng@...il.com>
> Cc: Nicolas Saenz Julienne <nsaenz@...nel.org>
> Cc: Marcelo Tosatti <mtosatti@...hat.com>
> Cc: Xiongfeng Wang <wangxiongfeng2@...wei.com>
> Cc: Yu Liao<liaoyu15@...wei.com>
> Cc: Phil Auld <pauld@...hat.com>
> Cc: Paul Gortmaker<paul.gortmaker@...driver.com>
> Cc: Alex Belits <abelits@...vell.com>
> ---
>  include/linux/context_tracking.h | 12 ++++++------
>  kernel/context_tracking.c        | 20 ++++++++++----------
>  2 files changed, 16 insertions(+), 16 deletions(-)
> 
> diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
> index 7a14807c9d1a..773035124bad 100644
> --- a/include/linux/context_tracking.h
> +++ b/include/linux/context_tracking.h
> @@ -14,8 +14,8 @@
>  extern void context_tracking_cpu_set(int cpu);
>  
>  /* Called with interrupts disabled.  */
> -extern void __context_tracking_enter(enum ctx_state state);
> -extern void __context_tracking_exit(enum ctx_state state);
> +extern void __ct_user_enter(enum ctx_state state);
> +extern void __ct_user_exit(enum ctx_state state);
>  
>  extern void context_tracking_enter(enum ctx_state state);
>  extern void context_tracking_exit(enum ctx_state state);
> @@ -38,13 +38,13 @@ static inline void user_exit(void)
>  static __always_inline void user_enter_irqoff(void)
>  {
>  	if (context_tracking_enabled())
> -		__context_tracking_enter(CONTEXT_USER);
> +		__ct_user_enter(CONTEXT_USER);
>  
>  }
>  static __always_inline void user_exit_irqoff(void)
>  {
>  	if (context_tracking_enabled())
> -		__context_tracking_exit(CONTEXT_USER);
> +		__ct_user_exit(CONTEXT_USER);
>  }
>  
>  static inline enum ctx_state exception_enter(void)
> @@ -74,7 +74,7 @@ static inline void exception_exit(enum ctx_state prev_ctx)
>  static __always_inline bool context_tracking_guest_enter(void)
>  {
>  	if (context_tracking_enabled())
> -		__context_tracking_enter(CONTEXT_GUEST);
> +		__ct_user_enter(CONTEXT_GUEST);
>  
>  	return context_tracking_enabled_this_cpu();
>  }
> @@ -82,7 +82,7 @@ static __always_inline bool context_tracking_guest_enter(void)
>  static __always_inline void context_tracking_guest_exit(void)
>  {
>  	if (context_tracking_enabled())
> -		__context_tracking_exit(CONTEXT_GUEST);
> +		__ct_user_exit(CONTEXT_GUEST);
>  }
>  
>  /**
> diff --git a/kernel/context_tracking.c b/kernel/context_tracking.c
> index 36a98c48aedc..ad2a973393a6 100644
> --- a/kernel/context_tracking.c
> +++ b/kernel/context_tracking.c
> @@ -51,15 +51,15 @@ static __always_inline void context_tracking_recursion_exit(void)
>  }
>  
>  /**
> - * context_tracking_enter - Inform the context tracking that the CPU is going
> - *                          enter user or guest space mode.
> + * __ct_user_enter - Inform the context tracking that the CPU is going
> + *		     to enter user or guest space mode.
>   *
>   * This function must be called right before we switch from the kernel
>   * to user or guest space, when it's guaranteed the remaining kernel
>   * instructions to execute won't use any RCU read side critical section
>   * because this function sets RCU in extended quiescent state.
>   */
> -void noinstr __context_tracking_enter(enum ctx_state state)
> +void noinstr __ct_user_enter(enum ctx_state state)
>  {
>  	/* Kernel threads aren't supposed to go to userspace */
>  	WARN_ON_ONCE(!current->mm);
> @@ -101,7 +101,7 @@ void noinstr __context_tracking_enter(enum ctx_state state)
>  	}
>  	context_tracking_recursion_exit();
>  }
> -EXPORT_SYMBOL_GPL(__context_tracking_enter);
> +EXPORT_SYMBOL_GPL(__ct_user_enter);
>  
>  void context_tracking_enter(enum ctx_state state)
>  {
> @@ -119,7 +119,7 @@ void context_tracking_enter(enum ctx_state state)
>  		return;
>  
>  	local_irq_save(flags);
> -	__context_tracking_enter(state);
> +	__ct_user_enter(state);
>  	local_irq_restore(flags);
>  }
>  NOKPROBE_SYMBOL(context_tracking_enter);
> @@ -132,8 +132,8 @@ void context_tracking_user_enter(void)
>  NOKPROBE_SYMBOL(context_tracking_user_enter);
>  
>  /**
> - * context_tracking_exit - Inform the context tracking that the CPU is
> - *                         exiting user or guest mode and entering the kernel.
> + * __ct_user_exit - Inform the context tracking that the CPU is
> + * 		    exiting user or guest mode and entering the kernel.
>   *
>   * This function must be called after we entered the kernel from user or
>   * guest space before any use of RCU read side critical section. This
> @@ -143,7 +143,7 @@ NOKPROBE_SYMBOL(context_tracking_user_enter);
>   * This call supports re-entrancy. This way it can be called from any exception
>   * handler without needing to know if we came from userspace or not.
>   */
> -void noinstr __context_tracking_exit(enum ctx_state state)
> +void noinstr __ct_user_exit(enum ctx_state state)
>  {
>  	if (!context_tracking_recursion_enter())
>  		return;
> @@ -166,7 +166,7 @@ void noinstr __context_tracking_exit(enum ctx_state state)
>  	}
>  	context_tracking_recursion_exit();
>  }
> -EXPORT_SYMBOL_GPL(__context_tracking_exit);
> +EXPORT_SYMBOL_GPL(__ct_user_exit);
>  
>  void context_tracking_exit(enum ctx_state state)
>  {
> @@ -176,7 +176,7 @@ void context_tracking_exit(enum ctx_state state)
>  		return;
>  
>  	local_irq_save(flags);
> -	__context_tracking_exit(state);
> +	__ct_user_exit(state);
>  	local_irq_restore(flags);
>  }
>  NOKPROBE_SYMBOL(context_tracking_exit);
> -- 
> 2.25.1
>