linux-kernel - [PATCH] mm: remove offset check on page->compound

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Date:   Thu,  6 Jan 2022 23:52:54 +0000
From:   Wei Yang <richard.weiyang@...il.com>
To:     peterz@...radead.org, akpm@...ux-foundation.org, vbabka@...e.cz,
        willy@...radead.org, will@...nel.org, linyunsheng@...wei.com,
        richard.weiyang@...il.com, aarcange@...hat.com,
        feng.tang@...el.com, ebiederm@...ssion.com
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] mm: remove offset check on page->compound_head and folio->lru

FOLIO_MATCH() is used to make sure struct page and folio has identical
layout for the first several words.

The comparison of offset between page->compound_head and folio->lru is
more like an internal check in struct page.

This patch just removes it.

Signed-off-by: Wei Yang <richard.weiyang@...il.com>
---
 include/linux/mm_types.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 0a2de709fe40..087d6768bc78 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -289,7 +289,6 @@ static_assert(sizeof(struct page) == sizeof(struct folio));
 FOLIO_MATCH(flags, flags);
 FOLIO_MATCH(lru, lru);
 FOLIO_MATCH(mapping, mapping);
-FOLIO_MATCH(compound_head, lru);
 FOLIO_MATCH(index, index);
 FOLIO_MATCH(private, private);
 FOLIO_MATCH(_mapcount, _mapcount);
-- 
2.33.1