Re: [PATCH v20 04/20] mm/thp: use head for head page in lru_add_page_tail

[Alex Shi]

在 2020/11/3 上午12:03, Matthew Wilcox 写道:
> On Fri, Oct 30, 2020 at 10:46:54AM +0800, Alex Shi wrote:
>> -static void lru_add_page_tail(struct page *page, struct page *page_tail,
>> +static void lru_add_page_tail(struct page *head, struct page *tail,
>>              struct lruvec *lruvec, struct list_head *list)
>>  {
>> -    VM_BUG_ON_PAGE(!PageHead(page), page);
>> -    VM_BUG_ON_PAGE(PageCompound(page_tail), page);
>> -    VM_BUG_ON_PAGE(PageLRU(page_tail), page);
>> +    VM_BUG_ON_PAGE(!PageHead(head), head);
>> +    VM_BUG_ON_PAGE(PageCompound(tail), head);
>> +    VM_BUG_ON_PAGE(PageLRU(tail), head);
> 
> These last two should surely have been
>       VM_BUG_ON_PAGE(PageCompound(tail), tail);
>       VM_BUG_ON_PAGE(PageLRU(tail), tail);
> 
> Also, what do people think about converting these to VM_BUG_ON_PGFLAGS?

Hi Matthew,

Thanks for reminder! Looks these changes worth for another patch.

> 
> Either way:
> 
> Reviewed-by: Matthew Wilcox (Oracle) <wi...@infradead.org>
> 


I will take this option this time. :)

Thanks!
Alex