linux-kernel - Re: [PATCH v6 1/4] mm/page_alloc: remove unused fpi_flags in free_pages

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Date: Tue, 20 Feb 2024 09:48:08 +0100
From: David Hildenbrand <david@...hat.com>
To: Zi Yan <ziy@...dia.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc: "Huang, Ying" <ying.huang@...el.com>, Ryan Roberts
 <ryan.roberts@....com>, Andrew Morton <akpm@...ux-foundation.org>,
 "Matthew Wilcox (Oracle)" <willy@...radead.org>,
 "Yin, Fengwei" <fengwei.yin@...el.com>, Yu Zhao <yuzhao@...gle.com>,
 Vlastimil Babka <vbabka@...e.cz>,
 "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
 Johannes Weiner <hannes@...xchg.org>,
 Baolin Wang <baolin.wang@...ux.alibaba.com>,
 Kemeng Shi <shikemeng@...weicloud.com>,
 Mel Gorman <mgorman@...hsingularity.net>, Rohan Puri
 <rohan.puri15@...il.com>, Mcgrof Chamberlain <mcgrof@...nel.org>,
 Adam Manzanares <a.manzanares@...sung.com>,
 "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Subject: Re: [PATCH v6 1/4] mm/page_alloc: remove unused fpi_flags in
 free_pages_prepare()

On 16.02.24 18:04, Zi Yan wrote:
> From: Zi Yan <ziy@...dia.com>
> 
> fpi_flags is only passed to should_skip_kasan_poison() but ignored
> by the function. Remove the unused parameter.
> 
> Signed-off-by: Zi Yan <ziy@...dia.com>
> ---
>   mm/page_alloc.c | 10 +++++-----
>   1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 7ae4b74c9e5c..70c1ed3addf3 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -1061,7 +1061,7 @@ static int free_tail_page_prepare(struct page *head_page, struct page *page)
>    * on-demand allocation and then freed again before the deferred pages
>    * initialization is done, but this is not likely to happen.
>    */
> -static inline bool should_skip_kasan_poison(struct page *page, fpi_t fpi_flags)
> +static inline bool should_skip_kasan_poison(struct page *page)
>   {
>   	if (IS_ENABLED(CONFIG_KASAN_GENERIC))
>   		return deferred_pages_enabled();
> @@ -1081,10 +1081,10 @@ static void kernel_init_pages(struct page *page, int numpages)
>   }
>   
>   static __always_inline bool free_pages_prepare(struct page *page,
> -			unsigned int order, fpi_t fpi_flags)
> +			unsigned int order)
>   {
>   	int bad = 0;
> -	bool skip_kasan_poison = should_skip_kasan_poison(page, fpi_flags);
> +	bool skip_kasan_poison = should_skip_kasan_poison(page);
>   	bool init = want_init_on_free();
>   	bool compound = PageCompound(page);
>   
> @@ -1266,7 +1266,7 @@ static void __free_pages_ok(struct page *page, unsigned int order,
>   	unsigned long pfn = page_to_pfn(page);
>   	struct zone *zone = page_zone(page);
>   
> -	if (!free_pages_prepare(page, order, fpi_flags))
> +	if (!free_pages_prepare(page, order))
>   		return;
>   
>   	/*
> @@ -2379,7 +2379,7 @@ static bool free_unref_page_prepare(struct page *page, unsigned long pfn,
>   {
>   	int migratetype;
>   
> -	if (!free_pages_prepare(page, order, FPI_NONE))
> +	if (!free_pages_prepare(page, order))
>   		return false;
>   
>   	migratetype = get_pfnblock_migratetype(page, pfn);

Likely due to

commit 0a54864f8dfb64b64c84c9db6ff70e0e93690a33
Author: Peter Collingbourne <pcc@...gle.com>
Date:   Thu Mar 9 20:29:14 2023 -0800

     kasan: remove PG_skip_kasan_poison flag

That removed the usage of fpi_flags in should_skip_kasan_poison.

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb