On Mon, Sep 14, 2020 at 04:55:45PM +0800, kernel test robot wrote:
> Greeting,
> 
> FYI, we noticed the following commit (built with gcc-9):
> 
> commit: 2037ab69a5cd8afe58347135010f6160ea368dd0 ("mm: Convert find_get_entry 
> to return the head page")

Thank you!

diff --git a/mm/swap_state.c b/mm/swap_state.c
index c2fb62f660a5..a22c2430e80c 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -427,6 +427,8 @@ struct page *find_get_incore_page(struct address_space 
*mapping, pgoff_t index)
        struct swap_info_struct *si;
        struct page *page = find_get_entry(mapping, index);
 
+       if (!page)
+               return page;
        if (!xa_is_value(page))
                return find_subpage(page, index);
        if (!shmem_mapping(mapping))

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