linux-kernel - Re: [PATCH v2 3/4] mm/hwpoison: pass pfn to num_poisoned_pages

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Date:   Wed, 7 Sep 2022 10:32:32 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Naoya Horiguchi <naoya.horiguchi@...ux.dev>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        David Hildenbrand <david@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Yang Shi <shy828301@...il.com>,
        Oscar Salvador <osalvador@...e.de>,
        Muchun Song <songmuchun@...edance.com>,
        Jane Chu <jane.chu@...cle.com>,
        Naoya Horiguchi <naoya.horiguchi@....com>,
        <linux-kernel@...r.kernel.org>, Linux-MM <linux-mm@...ck.org>
Subject: Re: [PATCH v2 3/4] mm/hwpoison: pass pfn to num_poisoned_pages_*()

On 2022/9/5 14:21, Naoya Horiguchi wrote:
> From: Naoya Horiguchi <naoya.horiguchi@....com>
> 
> No functional change.
> 
> Signed-off-by: Naoya Horiguchi <naoya.horiguchi@....com>
> ---
>  arch/parisc/kernel/pdt.c |  2 +-
>  include/linux/mm.h       |  2 +-
>  mm/memory-failure.c      | 16 ++++++++--------
>  3 files changed, 10 insertions(+), 10 deletions(-)
> 
> diff --git a/arch/parisc/kernel/pdt.c b/arch/parisc/kernel/pdt.c
> index fdc880e2575a..80943a00e245 100644
> --- a/arch/parisc/kernel/pdt.c
> +++ b/arch/parisc/kernel/pdt.c
> @@ -231,7 +231,7 @@ void __init pdc_pdt_init(void)
>  
>  		/* mark memory page bad */
>  		memblock_reserve(pdt_entry[i] & PAGE_MASK, PAGE_SIZE);
> -		num_poisoned_pages_inc();
> +		num_poisoned_pages_inc(addr >> PAGE_SHIFT);
>  	}
>  }
>  
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index b81dd600e51a..6316973afd1d 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -3203,7 +3203,7 @@ static inline int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
>  	return 0;
>  }

It seems declaration of num_poisoned_pages_inc() is still missing in this patch.

With that fixed:
Reviewed-by: Miaohe Lin <linmiaohe@...wei.com>

Thanks,
Miaohe Lin

>  
> -static inline void num_poisoned_pages_inc()
> +static inline void num_poisoned_pages_inc(unsigned long pfn)
>  {
>  }
>  #endif
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index b6236c721f54..7dd4e403e634 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -74,17 +74,17 @@ atomic_long_t num_poisoned_pages __read_mostly = ATOMIC_LONG_INIT(0);
>  
>  static bool hw_memory_failure __read_mostly = false;
>  
> -static inline void num_poisoned_pages_inc(void)
> +static inline void num_poisoned_pages_inc(unsigned long pfn)
>  {
>  	atomic_long_inc(&num_poisoned_pages);
>  }
>  
> -static inline void num_poisoned_pages_dec(void)
> +static inline void num_poisoned_pages_dec(unsigned long pfn)
>  {
>  	atomic_long_dec(&num_poisoned_pages);
>  }
>  
> -static inline void num_poisoned_pages_sub(long i)
> +static inline void num_poisoned_pages_sub(unsigned long pfn, long i)
>  {
>  	atomic_long_sub(i, &num_poisoned_pages);
>  }
> @@ -130,7 +130,7 @@ static bool page_handle_poison(struct page *page, bool hugepage_or_freepage, boo
>  	if (release)
>  		put_page(page);
>  	page_ref_inc(page);
> -	num_poisoned_pages_inc();
> +	num_poisoned_pages_inc(page_to_pfn(page));
>  
>  	return true;
>  }
> @@ -1196,7 +1196,7 @@ static void action_result(unsigned long pfn, enum mf_action_page_type type,
>  {
>  	trace_memory_failure_event(pfn, type, result);
>  
> -	num_poisoned_pages_inc();
> +	num_poisoned_pages_inc(pfn);
>  	pr_err("%#lx: recovery action for %s: %s\n",
>  		pfn, action_page_types[type], action_name[result]);
>  }
> @@ -1743,7 +1743,7 @@ static int hugetlb_set_page_hwpoison(struct page *hpage, struct page *page)
>  		llist_add(&raw_hwp->node, head);
>  		/* the first error event will be counted in action_result(). */
>  		if (ret)
> -			num_poisoned_pages_inc();
> +			num_poisoned_pages_inc(page_to_pfn(page));
>  	} else {
>  		/*
>  		 * Failed to save raw error info.  We no longer trace all
> @@ -2408,7 +2408,7 @@ int unpoison_memory(unsigned long pfn)
>  unlock_mutex:
>  	mutex_unlock(&mf_mutex);
>  	if (!ret || freeit) {
> -		num_poisoned_pages_sub(count);
> +		num_poisoned_pages_sub(pfn, count);
>  		unpoison_pr_info("Unpoison: Software-unpoisoned page %#lx\n",
>  				 page_to_pfn(p), &unpoison_rs);
>  	}
> @@ -2625,7 +2625,7 @@ void clear_hwpoisoned_pages(struct page *memmap, int nr_pages)
>  
>  	for (i = 0; i < nr_pages; i++) {
>  		if (PageHWPoison(&memmap[i])) {
> -			num_poisoned_pages_dec();
> +			num_poisoned_pages_dec(page_to_pfn(&memmap[i]));
>  			ClearPageHWPoison(&memmap[i]);
>  		}
>  	}
>