linux-kernel - Re: [PATCH 04/10] mm,hwpoison: remove MF_COUNT

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Date:   Wed, 11 Sep 2019 12:24:10 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Oscar Salvador <osalvador@...e.de>, n-horiguchi@...jp.nec.com
Cc:     mhocko@...nel.org, mike.kravetz@...cle.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/10] mm,hwpoison: remove MF_COUNT_INCREASED

On 10.09.19 12:30, Oscar Salvador wrote:
> From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> 
> Now there's no user of MF_COUNT_INCREASED, so we can safely remove
> it from all calling points.
> 
> Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
> Signed-off-by: Oscar Salvador <osalvador@...e.de>
> ---
>  include/linux/mm.h  |  7 +++----
>  mm/memory-failure.c | 16 +++-------------
>  2 files changed, 6 insertions(+), 17 deletions(-)
> 
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index ad6766a08f9b..fb36a4165a4e 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -2814,10 +2814,9 @@ void register_page_bootmem_memmap(unsigned long section_nr, struct page *map,
>  				  unsigned long nr_pages);
>  
>  enum mf_flags {
> -	MF_COUNT_INCREASED = 1 << 0,
> -	MF_ACTION_REQUIRED = 1 << 1,
> -	MF_MUST_KILL = 1 << 2,
> -	MF_SOFT_OFFLINE = 1 << 3,
> +	MF_ACTION_REQUIRED = 1 << 0,
> +	MF_MUST_KILL = 1 << 1,
> +	MF_SOFT_OFFLINE = 1 << 2,
>  };
>  extern int memory_failure(unsigned long pfn, int flags);
>  extern void memory_failure_queue(unsigned long pfn, int flags);
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index e43b61462fd5..1be785b25324 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -1092,7 +1092,7 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
>  
>  	num_poisoned_pages_inc();
>  
> -	if (!(flags & MF_COUNT_INCREASED) && !get_hwpoison_page(p)) {
> +	if (!get_hwpoison_page(p)) {
>  		/*
>  		 * Check "filter hit" and "race with other subpage."
>  		 */
> @@ -1286,7 +1286,7 @@ int memory_failure(unsigned long pfn, int flags)
>  	 * In fact it's dangerous to directly bump up page count from 0,
>  	 * that may make page_ref_freeze()/page_ref_unfreeze() mismatch.
>  	 */
> -	if (!(flags & MF_COUNT_INCREASED) && !get_hwpoison_page(p)) {
> +	if (!get_hwpoison_page(p)) {
>  		if (is_free_buddy_page(p)) {
>  			action_result(pfn, MF_MSG_BUDDY, MF_DELAYED);
>  			return 0;
> @@ -1327,10 +1327,7 @@ int memory_failure(unsigned long pfn, int flags)
>  	shake_page(p, 0);
>  	/* shake_page could have turned it free. */
>  	if (!PageLRU(p) && is_free_buddy_page(p)) {
> -		if (flags & MF_COUNT_INCREASED)
> -			action_result(pfn, MF_MSG_BUDDY, MF_DELAYED);
> -		else
> -			action_result(pfn, MF_MSG_BUDDY_2ND, MF_DELAYED);
> +		action_result(pfn, MF_MSG_BUDDY_2ND, MF_DELAYED);
>  		return 0;
>  	}
>  
> @@ -1618,9 +1615,6 @@ static int __get_any_page(struct page *p, unsigned long pfn, int flags)
>  {
>  	int ret;
>  
> -	if (flags & MF_COUNT_INCREASED)
> -		return 1;
> -
>  	/*
>  	 * When the target page is a free hugepage, just remove it
>  	 * from free hugepage list.
> @@ -1890,15 +1884,11 @@ int soft_offline_page(struct page *page, int flags)
>  	if (is_zone_device_page(page)) {
>  		pr_debug_ratelimited("soft_offline: %#lx page is device page\n",
>  				pfn);
> -		if (flags & MF_COUNT_INCREASED)
> -			put_page(page);
>  		return -EIO;
>  	}
>  
>  	if (PageHWPoison(page)) {
>  		pr_info("soft offline: %#lx page already poisoned\n", pfn);
> -		if (flags & MF_COUNT_INCREASED)
> -			put_hwpoison_page(page);
>  		return -EBUSY;
>  	}
>  
> 

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

-- 

Thanks,

David / dhildenb