Re: + mm-add-pageanonnotksm-fix.patch added to mm-nonmm-unstable branch

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

On Fri, Oct 04, 2024 at 10:32:44AM -0700, Andrew Morton wrote:
>  static __always_inline void SetPageAnonExclusive(struct page *page)
>  {
> -	VM_BUG_ON_PGFLAGS(PageAnonNotKsm(page), page);
> +//	VM_BUG_ON_PGFLAGS(PageAnonNotKsm(page), page);
>  	VM_BUG_ON_PGFLAGS(PageHuge(page) && !PageHead(page), page);

This instead please:

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 84746da35f79..2b2defc2732f 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -1131,14 +1131,14 @@ static __always_inline int PageAnonExclusive(const struct page *page)
 
 static __always_inline void SetPageAnonExclusive(struct page *page)
 {
-	VM_BUG_ON_PGFLAGS(PageAnonNotKsm(page), page);
+	VM_BUG_ON_PGFLAGS(!PageAnonNotKsm(page), page);
 	VM_BUG_ON_PGFLAGS(PageHuge(page) && !PageHead(page), page);
 	set_bit(PG_anon_exclusive, &PF_ANY(page, 1)->flags);
 }
 
 static __always_inline void ClearPageAnonExclusive(struct page *page)
 {
-	VM_BUG_ON_PGFLAGS(PageAnonNotKsm(page), page);
+	VM_BUG_ON_PGFLAGS(!PageAnonNotKsm(page), page);
 	VM_BUG_ON_PGFLAGS(PageHuge(page) && !PageHead(page), page);
 	clear_bit(PG_anon_exclusive, &PF_ANY(page, 1)->flags);
 }