[PATCH 1/2] mm/page_ext: Drop definition of unused PAGE_EXT_DEBUG_POISON

[Kirill A. Shutemov]

After bd33ef368135 ("mm: enable page poisoning early at boot")
PAGE_EXT_DEBUG_POISON is not longer used. Remove it.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Reviewed-by: Vinayak Menon <vinmenon@xxxxxxxxxxxxxx>
---
 include/linux/page_ext.h | 11 -----------
 1 file changed, 11 deletions(-)

diff --git a/include/linux/page_ext.h b/include/linux/page_ext.h
index ca5461efae2f..bbec618a614b 100644
--- a/include/linux/page_ext.h
+++ b/include/linux/page_ext.h
@@ -16,18 +16,7 @@ struct page_ext_operations {
 
 #ifdef CONFIG_PAGE_EXTENSION
 
-/*
- * page_ext->flags bits:
- *
- * PAGE_EXT_DEBUG_POISON is set for poisoned pages. This is used to
- * implement generic debug pagealloc feature. The pages are filled with
- * poison patterns and set this flag after free_pages(). The poisoned
- * pages are verified whether the patterns are not corrupted and clear
- * the flag before alloc_pages().
- */
-
 enum page_ext_flags {
-	PAGE_EXT_DEBUG_POISON,		/* Page is poisoned */
 	PAGE_EXT_DEBUG_GUARD,
 	PAGE_EXT_OWNER,
 #if defined(CONFIG_IDLE_PAGE_TRACKING) && !defined(CONFIG_64BIT)
-- 
2.17.0