On 2024/6/7 11:47, Matthew Wilcox wrote: > On Thu, Jun 06, 2024 at 02:32:44PM +0800, Miaohe Lin wrote: >> +++ b/mm/internal.h >> @@ -1077,6 +1077,16 @@ extern u64 hwpoison_filter_flags_mask; >> extern u64 hwpoison_filter_flags_value; >> extern u64 hwpoison_filter_memcg; >> extern u32 hwpoison_filter_enable; >> +#define MAGIC_HWPOISON 0x48575053U /* HWPS */ >> +extern void SetPageHWPoisonTakenOff(struct page *page); >> +extern void ClearPageHWPoisonTakenOff(struct page *page); >> +extern bool take_page_off_buddy(struct page *page); >> +extern bool put_page_back_buddy(struct page *page); > > s/extern// for function declarations. Will do in next version. Thanks. .