linux-kernel - Re: [PATCH 2/2] mm: memory_hotplug: cleanup after removal of pfn_valid

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Date:   Tue, 13 Jul 2021 11:54:08 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Mike Rapoport <rppt@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 2/2] mm: memory_hotplug: cleanup after removal of
 pfn_valid_within()

On 13.07.21 10:00, Mike Rapoport wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
> 
> When test_pages_in_a_zone() used pfn_valid_within() is has some logic
> surrounding pfn_valid_within() checks.
> 
> Since pfn_valid_within() is gone, this logic can be removed.
> 
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>
> ---
>   mm/memory_hotplug.c | 9 +++------
>   1 file changed, 3 insertions(+), 6 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 1085bd03ecba..ca09045bb587 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -1298,7 +1298,7 @@ struct zone *test_pages_in_a_zone(unsigned long start_pfn,
>   	unsigned long pfn, sec_end_pfn;
>   	struct zone *zone = NULL;
>   	struct page *page;
> -	int i;
> +
>   	for (pfn = start_pfn, sec_end_pfn = SECTION_ALIGN_UP(start_pfn + 1);
>   	     pfn < end_pfn;
>   	     pfn = sec_end_pfn, sec_end_pfn += PAGES_PER_SECTION) {
> @@ -1307,13 +1307,10 @@ struct zone *test_pages_in_a_zone(unsigned long start_pfn,
>   			continue;
>   		for (; pfn < sec_end_pfn && pfn < end_pfn;
>   		     pfn += MAX_ORDER_NR_PAGES) {
> -			i = 0;
> -			if (i == MAX_ORDER_NR_PAGES || pfn + i >= end_pfn)
> -				continue;
>   			/* Check if we got outside of the zone */
> -			if (zone && !zone_spans_pfn(zone, pfn + i))
> +			if (zone && !zone_spans_pfn(zone, pfn))
>   				return NULL;
> -			page = pfn_to_page(pfn + i);
> +			page = pfn_to_page(pfn);
>   			if (zone && page_zone(page) != zone)
>   				return NULL;
>   			zone = page_zone(page);
> 

I'd just squash that into the previous commit.

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

-- 
Thanks,

David / dhildenb