linux-kernel - Re: [PATCH 08/15] mm/swap: make page_swapcount and __lru_add_drain

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Date:   Thu, 19 May 2022 09:54:10 +0800
From:   Miaohe Lin <linmiaohe@...wei.com>
To:     Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>
CC:     <willy@...radead.org>, <vbabka@...e.cz>, <dhowells@...hat.com>,
        <neilb@...e.de>, <apopple@...dia.com>, <david@...hat.com>,
        <surenb@...gle.com>, <peterx@...hat.com>,
        <naoya.horiguchi@....com>, <linux-mm@...ck.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 08/15] mm/swap: make page_swapcount and
 __lru_add_drain_all

On 2022/5/18 17:46, Oscar Salvador wrote:
> On Mon, May 09, 2022 at 09:14:09PM +0800, Miaohe Lin wrote:
>> Make page_swapcount and __lru_add_drain_all static. They are only used
>> within the file now.
>>
>> Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
> 
> I think the commit message is missing the "static" word.

Yes, you're right. The commit message should be "mm/swap: make page_swapcount and __lru_add_drain_all static". :)

Hi Andrew,
Could you please help tweak the commit message? Or I will send a new version soon if requested.
Thanks a lot!

> 
> Reviewed-by: Oscar Salvador <osalvador@...e.de>

Many thanks for your review and comment!

> 
>> ---
>>  include/linux/swap.h | 7 -------
>>  mm/swap.c            | 2 +-
>>  mm/swapfile.c        | 2 +-
>>  3 files changed, 2 insertions(+), 9 deletions(-)
>>
>> diff --git a/include/linux/swap.h b/include/linux/swap.h
>> index 999c7d79c2d5..8772132d21dc 100644
>> --- a/include/linux/swap.h
>> +++ b/include/linux/swap.h
>> @@ -490,7 +490,6 @@ int swap_type_of(dev_t device, sector_t offset);
>>  int find_first_swap(dev_t *device);
>>  extern unsigned int count_swap_pages(int, int);
>>  extern sector_t swapdev_block(int, pgoff_t);
>> -extern int page_swapcount(struct page *);
>>  extern int __swap_count(swp_entry_t entry);
>>  extern int __swp_swapcount(swp_entry_t entry);
>>  extern int swp_swapcount(swp_entry_t entry);
>> @@ -562,12 +561,6 @@ static inline void put_swap_page(struct page *page, swp_entry_t swp)
>>  {
>>  }
>>  
>> -
>> -static inline int page_swapcount(struct page *page)
>> -{
>> -	return 0;
>> -}
>> -
>>  static inline int __swap_count(swp_entry_t entry)
>>  {
>>  	return 0;
>> diff --git a/mm/swap.c b/mm/swap.c
>> index 7e320ec08c6a..6d2c37f781f8 100644
>> --- a/mm/swap.c
>> +++ b/mm/swap.c
>> @@ -748,7 +748,7 @@ static void lru_add_drain_per_cpu(struct work_struct *dummy)
>>   * Calling this function with cpu hotplug locks held can actually lead
>>   * to obscure indirect dependencies via WQ context.
>>   */
>> -inline void __lru_add_drain_all(bool force_all_cpus)
>> +static inline void __lru_add_drain_all(bool force_all_cpus)
>>  {
>>  	/*
>>  	 * lru_drain_gen - Global pages generation number
>> diff --git a/mm/swapfile.c b/mm/swapfile.c
>> index 7b4c99ca2aea..133e03fea104 100644
>> --- a/mm/swapfile.c
>> +++ b/mm/swapfile.c
>> @@ -1430,7 +1430,7 @@ void swapcache_free_entries(swp_entry_t *entries, int n)
>>   * This does not give an exact answer when swap count is continued,
>>   * but does include the high COUNT_CONTINUED flag to allow for that.
>>   */
>> -int page_swapcount(struct page *page)
>> +static int page_swapcount(struct page *page)
>>  {
>>  	int count = 0;
>>  	struct swap_info_struct *p;
>> -- 
>> 2.23.0
>>
>>
>