Date:   Wed, 8 Feb 2023 17:40:36 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     andrey.konovalov@...ux.dev, Marco Elver <elver@...gle.com>,
        Alexander Potapenko <glider@...gle.com>
Cc:     Andrey Konovalov <andreyknvl@...il.com>,
        kasan-dev@...glegroups.com, Evgenii Stepanov <eugenis@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Andrey Konovalov <andreyknvl@...gle.com>
Subject: Re: [PATCH 04/18] lib/stackdepot, mm: rename
 stack_depot_want_early_init

On 1/30/23 21:49, andrey.konovalov@...ux.dev wrote:
> From: Andrey Konovalov <andreyknvl@...gle.com>
> 
> Rename stack_depot_want_early_init to stack_depot_request_early_init.
> 
> The old name is confusing, as it hints at returning some kind of intention
> of stack depot. The new name reflects that this function requests an action
> from stack depot instead.
> 
> No functional changes.
> 
> Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>

Acked-by: Vlastimil Babka <vbabka@...e.cz>

> ---
>  include/linux/stackdepot.h | 14 +++++++-------
>  lib/stackdepot.c           | 10 +++++-----
>  mm/page_owner.c            |  2 +-
>  mm/slub.c                  |  4 ++--
>  4 files changed, 15 insertions(+), 15 deletions(-)
> 
> diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h
> index 1296a6eeaec0..c4e3abc16b16 100644
> --- a/include/linux/stackdepot.h
> +++ b/include/linux/stackdepot.h
> @@ -31,26 +31,26 @@ typedef u32 depot_stack_handle_t;
>   * enabled as part of mm_init(), for subsystems where it's known at compile time
>   * that stack depot will be used.
>   *
> - * Another alternative is to call stack_depot_want_early_init(), when the
> + * Another alternative is to call stack_depot_request_early_init(), when the
>   * decision to use stack depot is taken e.g. when evaluating kernel boot
>   * parameters, which precedes the enablement point in mm_init().
>   *
> - * stack_depot_init() and stack_depot_want_early_init() can be called regardless
> - * of CONFIG_STACKDEPOT and are no-op when disabled. The actual save/fetch/print
> - * functions should only be called from code that makes sure CONFIG_STACKDEPOT
> - * is enabled.
> + * stack_depot_init() and stack_depot_request_early_init() can be called
> + * regardless of CONFIG_STACKDEPOT and are no-op when disabled. The actual
> + * save/fetch/print functions should only be called from code that makes sure
> + * CONFIG_STACKDEPOT is enabled.
>   */
>  #ifdef CONFIG_STACKDEPOT
>  int stack_depot_init(void);
>  
> -void __init stack_depot_want_early_init(void);
> +void __init stack_depot_request_early_init(void);
>  
>  /* This is supposed to be called only from mm_init() */
>  int __init stack_depot_early_init(void);
>  #else
>  static inline int stack_depot_init(void) { return 0; }
>  
> -static inline void stack_depot_want_early_init(void) { }
> +static inline void stack_depot_request_early_init(void) { }
>  
>  static inline int stack_depot_early_init(void)	{ return 0; }
>  #endif
> diff --git a/lib/stackdepot.c b/lib/stackdepot.c
> index 90c4dd48d75e..8743fad1485f 100644
> --- a/lib/stackdepot.c
> +++ b/lib/stackdepot.c
> @@ -71,7 +71,7 @@ struct stack_record {
>  	unsigned long entries[];	/* Variable-sized array of entries. */
>  };
>  
> -static bool __stack_depot_want_early_init __initdata = IS_ENABLED(CONFIG_STACKDEPOT_ALWAYS_INIT);
> +static bool __stack_depot_early_init_requested __initdata = IS_ENABLED(CONFIG_STACKDEPOT_ALWAYS_INIT);
>  static bool __stack_depot_early_init_passed __initdata;
>  
>  static void *stack_slabs[STACK_ALLOC_MAX_SLABS];
> @@ -107,12 +107,12 @@ static int __init is_stack_depot_disabled(char *str)
>  }
>  early_param("stack_depot_disable", is_stack_depot_disabled);
>  
> -void __init stack_depot_want_early_init(void)
> +void __init stack_depot_request_early_init(void)
>  {
> -	/* Too late to request early init now */
> +	/* Too late to request early init now. */
>  	WARN_ON(__stack_depot_early_init_passed);
>  
> -	__stack_depot_want_early_init = true;
> +	__stack_depot_early_init_requested = true;
>  }
>  
>  int __init stack_depot_early_init(void)
> @@ -128,7 +128,7 @@ int __init stack_depot_early_init(void)
>  	if (kasan_enabled() && !stack_hash_order)
>  		stack_hash_order = STACK_HASH_ORDER_MAX;
>  
> -	if (!__stack_depot_want_early_init || stack_depot_disable)
> +	if (!__stack_depot_early_init_requested || stack_depot_disable)
>  		return 0;
>  
>  	if (stack_hash_order)
> diff --git a/mm/page_owner.c b/mm/page_owner.c
> index 2d27f532df4c..90a4a087e6c7 100644
> --- a/mm/page_owner.c
> +++ b/mm/page_owner.c
> @@ -48,7 +48,7 @@ static int __init early_page_owner_param(char *buf)
>  	int ret = kstrtobool(buf, &page_owner_enabled);
>  
>  	if (page_owner_enabled)
> -		stack_depot_want_early_init();
> +		stack_depot_request_early_init();
>  
>  	return ret;
>  }
> diff --git a/mm/slub.c b/mm/slub.c
> index 13459c69095a..f2c6c356bc36 100644
> --- a/mm/slub.c
> +++ b/mm/slub.c
> @@ -1592,7 +1592,7 @@ static int __init setup_slub_debug(char *str)
>  		} else {
>  			slab_list_specified = true;
>  			if (flags & SLAB_STORE_USER)
> -				stack_depot_want_early_init();
> +				stack_depot_request_early_init();
>  		}
>  	}
>  
> @@ -1611,7 +1611,7 @@ static int __init setup_slub_debug(char *str)
>  out:
>  	slub_debug = global_flags;
>  	if (slub_debug & SLAB_STORE_USER)
> -		stack_depot_want_early_init();
> +		stack_depot_request_early_init();
>  	if (slub_debug != 0 || slub_debug_string)
>  		static_branch_enable(&slub_debug_enabled);
>  	else

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