linux-kernel - [PATCH 2/2] mm: Remove PG

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Message-ID: <20240724010550.1755992-3-willy@infradead.org>
Date: Wed, 24 Jul 2024 02:05:47 +0100
From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH 2/2] mm: Remove PG_error

The PG_error bit is now unused; delete it and free up a bit in
page->flags.

Cc: linux-mm@...ck.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/page-flags.h | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
index 5769fe6e4950..a0a29bd092f8 100644
--- a/include/linux/page-flags.h
+++ b/include/linux/page-flags.h
@@ -66,8 +66,6 @@
  * PG_referenced, PG_reclaim are used for page reclaim for anonymous and
  * file-backed pagecache (see mm/vmscan.c).
  *
- * PG_error is set to indicate that an I/O error occurred on this page.
- *
  * PG_arch_1 is an architecture specific page state bit.  The generic code
  * guarantees that this bit is cleared for a page when it first is entered into
  * the page cache.
@@ -103,7 +101,6 @@ enum pageflags {
 	PG_waiters,		/* Page has waiters, check its waitqueue. Must be bit #7 and in the same byte as "PG_locked" */
 	PG_active,
 	PG_workingset,
-	PG_error,
 	PG_owner_priv_1,	/* Owner use. If pagecache, fs may use*/
 	PG_arch_1,
 	PG_reserved,
@@ -183,7 +180,7 @@ enum pageflags {
 	 */
 
 	/* At least one page in this folio has the hwpoison flag set */
-	PG_has_hwpoisoned = PG_error,
+	PG_has_hwpoisoned = PG_active,
 	PG_large_rmappable = PG_workingset, /* anon or file-backed */
 };
 
@@ -506,7 +503,6 @@ static inline int TestClearPage##uname(struct page *page) { return 0; }
 
 __PAGEFLAG(Locked, locked, PF_NO_TAIL)
 FOLIO_FLAG(waiters, FOLIO_HEAD_PAGE)
-PAGEFLAG(Error, error, PF_NO_TAIL) TESTCLEARFLAG(Error, error, PF_NO_TAIL)
 FOLIO_FLAG(referenced, FOLIO_HEAD_PAGE)
 	FOLIO_TEST_CLEAR_FLAG(referenced, FOLIO_HEAD_PAGE)
 	__FOLIO_SET_FLAG(referenced, FOLIO_HEAD_PAGE)
-- 
2.43.0