linux-kernel - Re: [PATCH v3 2/4] mm/hwpoison: move definitions of num_poisoned_pages

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Message-ID: <c714d385-ba78-b77b-1813-1f9cc4a78c1b@huawei.com>
Date:   Wed, 28 Sep 2022 15:56:30 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Naoya Horiguchi <naoya.horiguchi@...ux.dev>
CC:     <linux-mm@...ck.org>, 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>
Subject: Re: [PATCH v3 2/4] mm/hwpoison: move definitions of
 num_poisoned_pages_* to memory-failure.c

On 2022/9/28 10:05, Naoya Horiguchi wrote:
> On Sat, Sep 24, 2022 at 07:53:15PM +0800, Miaohe Lin wrote:
>> On 2022/9/21 17:13, Naoya Horiguchi wrote:
>>> From: Naoya Horiguchi <naoya.horiguchi@....com>
>>>
>>> These interfaces will be used by drivers/base/core.c by later patch, so as a
>>> preparatory work move them to more common header file visible to the file.
>>>
>>> Signed-off-by: Naoya Horiguchi <naoya.horiguchi@....com>
>>> ---
>>> ChangeLog v2 -> v3:
>>> - added declaration of num_poisoned_pages_inc() in #ifdef CONFIG_MEMORY_FAILURE
>>> ---
>>>  arch/parisc/kernel/pdt.c |  3 +--
>>>  include/linux/mm.h       |  5 +++++
>>>  include/linux/swapops.h  | 24 ++----------------------
>>>  mm/memory-failure.c      | 10 ++++++++++
>>>  4 files changed, 18 insertions(+), 24 deletions(-)
>>>
>>> diff --git a/arch/parisc/kernel/pdt.c b/arch/parisc/kernel/pdt.c
>>> index e391b175f5ec..fdc880e2575a 100644
>>> --- a/arch/parisc/kernel/pdt.c
>>> +++ b/arch/parisc/kernel/pdt.c
>>> @@ -18,8 +18,7 @@
>>>  #include <linux/kthread.h>
>>>  #include <linux/initrd.h>
>>>  #include <linux/pgtable.h>
>>> -#include <linux/swap.h>
>>
>> Is header file "linux/swap.h" already unneeded before the code change? It seems there's
>> no code change in that file.
> 
> Maybe yes.  I updated this line too because it's introduced together
> swapops.h by the following commit.
> 
>   commit 0e5a7ff6e36ad58933d076ddcac36ff14d014692
>   Author: Helge Deller <deller@....de>
>   Date:   Fri Jul 24 19:17:52 2020 +0200
>   
>       parisc: Report bad pages as HardwareCorrupted
> 

I see. Many thanks for your explanation.

>>
>>> -#include <linux/swapops.h>
>>> +#include <linux/mm.h>
>>>  
>>>  #include <asm/pdc.h>
>>>  #include <asm/pdcpat.h>
>>> diff --git a/include/linux/mm.h b/include/linux/mm.h
>>> index c2277f5aba9e..80a2d800f272 100644
>>> --- a/include/linux/mm.h
>>> +++ b/include/linux/mm.h
>>> @@ -3279,11 +3279,16 @@ extern atomic_long_t num_poisoned_pages __read_mostly;
>>>  extern int soft_offline_page(unsigned long pfn, int flags);
>>>  #ifdef CONFIG_MEMORY_FAILURE
>>>  extern int __get_huge_page_for_hwpoison(unsigned long pfn, int flags);
>>> +extern void num_poisoned_pages_inc(void);
>>>  #else
>>>  static inline int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
>>>  {
>>>  	return 0;
>>>  }
>>> +
>>> +static inline void num_poisoned_pages_inc(void)
>>> +{
>>> +}
>>>  #endif
>>>  
>>>  #ifndef arch_memory_failure
>>> diff --git a/include/linux/swapops.h b/include/linux/swapops.h
>>> index a91dd08e107b..3e58a812399a 100644
>>> --- a/include/linux/swapops.h
>>> +++ b/include/linux/swapops.h
>>> @@ -581,8 +581,6 @@ static inline int is_pmd_migration_entry(pmd_t pmd)
>>>  
>>>  #ifdef CONFIG_MEMORY_FAILURE
>>>  
>>> -extern atomic_long_t num_poisoned_pages __read_mostly;
>>> -
>>>  /*
>>>   * Support for hardware poisoned pages
>>>   */
>>> @@ -610,17 +608,7 @@ static inline struct page *hwpoison_entry_to_page(swp_entry_t entry)
>>>  	return p;
>>>  }
>>>  
>>> -static inline void num_poisoned_pages_inc(void)
>>> -{
>>> -	atomic_long_inc(&num_poisoned_pages);
>>> -}
>>> -
>>> -static inline void num_poisoned_pages_sub(long i)
>>> -{
>>> -	atomic_long_sub(i, &num_poisoned_pages);
>>> -}
>>> -
>>> -#else  /* CONFIG_MEMORY_FAILURE */
>>> +#else
>>>  
>>>  static inline swp_entry_t make_hwpoison_entry(struct page *page)
>>>  {
>>> @@ -636,15 +624,7 @@ static inline struct page *hwpoison_entry_to_page(swp_entry_t entry)
>>>  {
>>>  	return NULL;
>>>  }
>>> -
>>> -static inline void num_poisoned_pages_inc(void)
>>> -{
>>> -}
>>> -
>>> -static inline void num_poisoned_pages_sub(long i)
>>> -{
>>> -}
>>> -#endif  /* CONFIG_MEMORY_FAILURE */
>>> +#endif
>>>  
>>>  static inline int non_swap_entry(swp_entry_t entry)
>>>  {
>>> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
>>> index 5942e1c0407e..aa6ce685b863 100644
>>> --- a/mm/memory-failure.c
>>> +++ b/mm/memory-failure.c
>>> @@ -74,6 +74,16 @@ 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)
>>
>> This function is defined as "static inline" while it's "extern void num_poisoned_pages_inc(void)"
>> in the header file. Is this expected?
> 
> No. 4/4 effectively fixes it, but I should've done this in this patch.
> Thank you,
> - Naoya Horiguchi

Then this patch looks good to me. Thanks.

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

Thanks,
Miaohe Lin