linux-kernel - Re: [PATCH] mm/compaction: Remove some useless code in compact

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Date:   Wed, 14 Oct 2020 14:28:23 +0200
From:   David Hildenbrand <david@...hat.com>
To:     yanfei.xu@...driver.com, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm/compaction: Remove some useless code in compact_zone()

On 14.10.20 09:23, yanfei.xu@...driver.com wrote:
> From: Yanfei Xu <yanfei.xu@...driver.com>
> 
> start_pfn has been declared at the begin of compact_zone(), it's
> no need to declare it again. And remove an useless semicolon.
> 
> Signed-off-by: Yanfei Xu <yanfei.xu@...driver.com>
> ---
>  mm/compaction.c | 3 +--
>  1 file changed, 1 insertion(+), 2 deletions(-)
> 
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 176dcded298e..5e69c1f94d96 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -2272,7 +2272,7 @@ compact_zone(struct compact_control *cc, struct capture_control *capc)
>  
>  	while ((ret = compact_finished(cc)) == COMPACT_CONTINUE) {
>  		int err;
> -		unsigned long start_pfn = cc->migrate_pfn;
> +		start_pfn = cc->migrate_pfn;

There is a user in

trace_mm_compaction_end(start_pfn, cc->migrate_pfn, cc->free_pfn,
end_pfn, sync, ret);

we would now trace a different value, no?

>  
>  		/*
>  		 * Avoid multiple rescans which can happen if a page cannot be
> @@ -2309,7 +2309,6 @@ compact_zone(struct compact_control *cc, struct capture_control *capc)
>  		case ISOLATE_SUCCESS:
>  			update_cached = false;
>  			last_migrated_pfn = start_pfn;
> -			;

Huh, how does something like that happen :)

-- 
Thanks,

David / dhildenb