linux-kernel - [PATCH 1/3] mm: pgtable: correct the wrong comment about ptdesc->__page

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Date: Mon,  4 Mar 2024 19:07:18 +0800
From: Qi Zheng <zhengqi.arch@...edance.com>
To: akpm@...ux-foundation.org,
	vishal.moola@...il.com,
	hughd@...gle.com,
	david@...hat.com,
	rppt@...nel.org,
	willy@...radead.org,
	muchun.song@...ux.dev
Cc: linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Qi Zheng <zhengqi.arch@...edance.com>
Subject: [PATCH 1/3] mm: pgtable: correct the wrong comment about ptdesc->__page_flags

The commit 32cc0b7c9d50 ("powerpc: add pte_free_defer() for pgtables
sharing page") introduced the use of PageActive flag to page table
fragments tracking, so the ptdesc->__page_flags is not unused, so
correct the wrong comment.

Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
---
 include/linux/mm_types.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index a7223ba3ea1e..5ea77969daae 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -419,7 +419,7 @@ FOLIO_MATCH(compound_head, _head_2a);
 
 /**
  * struct ptdesc -    Memory descriptor for page tables.
- * @__page_flags:     Same as page flags. Unused for page tables.
+ * @__page_flags:     Same as page flags. Powerpc only.
  * @pt_rcu_head:      For freeing page table pages.
  * @pt_list:          List of used page tables. Used for s390 and x86.
  * @_pt_pad_1:        Padding that aliases with page's compound head.
-- 
2.30.2