linux-kernel - Re: [PATCH v2 02/14] mm/page_alloc: add helper for checking if check_pages

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Message-ID: <b142ad8b-36a2-7d96-1fb0-2b1e82634fc5@suse.cz>
Date:   Wed, 22 Mar 2023 12:38:36 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Hildenbrand <david@...hat.com>,
        Doug Berger <opendmb@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        linux-kernel@...r.kernel.org, linux-mips@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH v2 02/14] mm/page_alloc: add helper for checking if
 check_pages_enabled

On 3/21/23 18:05, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@...nel.org>
> 
> Instead of duplicating long static_branch_enabled(&check_pages_enabled)
> wrap it in a helper function is_check_pages_enabled()
> 
> Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
> Reviewed-by: David Hildenbrand <david@...hat.com>

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

> ---
>  mm/page_alloc.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 87d760236dba..e1149d54d738 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -245,6 +245,11 @@ EXPORT_SYMBOL(init_on_free);
>  /* perform sanity checks on struct pages being allocated or freed */
>  static DEFINE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM, check_pages_enabled);
>  
> +static inline bool is_check_pages_enabled(void)
> +{
> +	return static_branch_unlikely(&check_pages_enabled);
> +}
> +
>  static bool _init_on_alloc_enabled_early __read_mostly
>  				= IS_ENABLED(CONFIG_INIT_ON_ALLOC_DEFAULT_ON);
>  static int __init early_init_on_alloc(char *buf)
> @@ -1443,7 +1448,7 @@ static __always_inline bool free_pages_prepare(struct page *page,
>  		for (i = 1; i < (1 << order); i++) {
>  			if (compound)
>  				bad += free_tail_pages_check(page, page + i);
> -			if (static_branch_unlikely(&check_pages_enabled)) {
> +			if (is_check_pages_enabled()) {
>  				if (unlikely(free_page_is_bad(page + i))) {
>  					bad++;
>  					continue;
> @@ -1456,7 +1461,7 @@ static __always_inline bool free_pages_prepare(struct page *page,
>  		page->mapping = NULL;
>  	if (memcg_kmem_online() && PageMemcgKmem(page))
>  		__memcg_kmem_uncharge_page(page, order);
> -	if (static_branch_unlikely(&check_pages_enabled)) {
> +	if (is_check_pages_enabled()) {
>  		if (free_page_is_bad(page))
>  			bad++;
>  		if (bad)
> @@ -2366,7 +2371,7 @@ static int check_new_page(struct page *page)
>  
>  static inline bool check_new_pages(struct page *page, unsigned int order)
>  {
> -	if (static_branch_unlikely(&check_pages_enabled)) {
> +	if (is_check_pages_enabled()) {
>  		for (int i = 0; i < (1 << order); i++) {
>  			struct page *p = page + i;
>