linux-kernel - Re: [PATCH] mm/page_alloc: invert logic for early page initialisation checks

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Date:   Thu, 5 Jan 2023 14:14:58 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/page_alloc: invert logic for early page initialisation
 checks



On 1/5/23 00:48, Mike Rapoport wrote:
> From: "Mike Rapoport (IBM)" <rppt@...nel.org>
> 
> Rename early_page_uninitialised() to early_page_initialised() and invert
> its logic to make the code more readable.
> 
> Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
> ---

LGTM

Reviewed-by: Anshuman Khandual <anshuman.khandual@....com>

>  mm/page_alloc.c | 16 ++++++++--------
>  1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 0745aedebb37..a881f2d42b2c 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -443,15 +443,15 @@ static inline bool deferred_pages_enabled(void)
>  	return static_branch_unlikely(&deferred_pages);
>  }
>  
> -/* Returns true if the struct page for the pfn is uninitialised */
> -static inline bool __meminit early_page_uninitialised(unsigned long pfn)
> +/* Returns true if the struct page for the pfn is initialised */
> +static inline bool __meminit early_page_initialised(unsigned long pfn)
>  {
>  	int nid = early_pfn_to_nid(pfn);
>  
>  	if (node_online(nid) && pfn >= NODE_DATA(nid)->first_deferred_pfn)
> -		return true;
> +		return false;
>  
> -	return false;
> +	return true;
>  }
>  
>  /*
> @@ -498,9 +498,9 @@ static inline bool deferred_pages_enabled(void)
>  	return false;
>  }
>  
> -static inline bool early_page_uninitialised(unsigned long pfn)
> +static inline bool early_page_initialised(unsigned long pfn)
>  {
> -	return false;
> +	return true;
>  }
>  
>  static inline bool defer_init(int nid, unsigned long pfn, unsigned long end_pfn)
> @@ -1641,7 +1641,7 @@ static void __meminit init_reserved_page(unsigned long pfn)
>  	pg_data_t *pgdat;
>  	int nid, zid;
>  
> -	if (!early_page_uninitialised(pfn))
> +	if (early_page_initialised(pfn))
>  		return;
>  
>  	nid = early_pfn_to_nid(pfn);
> @@ -1804,7 +1804,7 @@ int __meminit early_pfn_to_nid(unsigned long pfn)
>  void __init memblock_free_pages(struct page *page, unsigned long pfn,
>  							unsigned int order)
>  {
> -	if (early_page_uninitialised(pfn))
> +	if (!early_page_initialised(pfn))
>  		return;
>  	if (!kmsan_memblock_free_pages(page, order)) {
>  		/* KMSAN will take care of these pages. */