+ fs-stable_page_flags-simplify-kpf_idle-handling.patch added to mm-new branch

The patch titled
     Subject: fs: stable_page_flags(): simplify KPF_IDLE handling
has been added to the -mm mm-new branch.  Its filename is
     fs-stable_page_flags-simplify-kpf_idle-handling.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fs-stable_page_flags-simplify-kpf_idle-handling.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Jinjiang Tu <[email protected]>
Subject: fs: stable_page_flags(): simplify KPF_IDLE handling
Date: Mon, 20 Jul 2026 11:30:21 +0800

For KPF_IDLE, folio_test_idle() check in set_ps_flags() already handles
all config cases, so remove the duplicate code in stable_page_flags() that
deals with CONFIG_PAGE_IDLE_FLAG for the 64‑bit case.

No functional change is intended.

Link: https://lore.kernel.org/[email protected]
Signed-off-by: Jinjiang Tu <[email protected]>
Acked-by: David Hildenbrand (Arm) <[email protected]>
Cc: Chengming Zhou <[email protected]>
Cc: Kefeng Wang <[email protected]>
Cc: Luiz Capitulino <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Miaohe Lin <[email protected]>
Cc: Nanyong Sun <[email protected]>
Cc: Svetly Todorov <[email protected]>
Cc: xu xin <[email protected]>
Cc: Zi Yan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---

 fs/proc/page.c |   10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

--- a/fs/proc/page.c~fs-stable_page_flags-simplify-kpf_idle-handling
+++ a/fs/proc/page.c
@@ -196,6 +196,9 @@ u64 stable_page_flags(const struct page
 	if (ps.flags & PAGE_SNAPSHOT_PG_BUDDY)
 		u |= BIT_ULL(KPF_BUDDY);
 
+	if (ps.flags & PAGE_SNAPSHOT_PG_IDLE)
+		u |= BIT_ULL(KPF_IDLE);
+
 	if (folio_test_offline(folio))
 		u |= BIT_ULL(KPF_OFFLINE);
 	if (folio_test_pgtable(folio))
@@ -203,13 +206,6 @@ u64 stable_page_flags(const struct page
 	if (folio_test_slab(folio))
 		u |= BIT_ULL(KPF_SLAB);
 
-#if defined(CONFIG_PAGE_IDLE_FLAG) && defined(CONFIG_64BIT)
-	u |= kpf_copy_bit(k, KPF_IDLE,          PG_idle);
-#else
-	if (ps.flags & PAGE_SNAPSHOT_PG_IDLE)
-		u |= BIT_ULL(KPF_IDLE);
-#endif
-
 	u |= kpf_copy_bit(k, KPF_LOCKED,	PG_locked);
 	u |= kpf_copy_bit(k, KPF_DIRTY,		PG_dirty);
 	u |= kpf_copy_bit(k, KPF_UPTODATE,	PG_uptodate);
_

Patches currently in -mm which might be from [email protected] are

fs-stable_page_flags-use-bit_ull-for-kpf-flags.patch
fs-stable_page_flags-use-folio_test_-helpers.patch
fs-stable_page_flags-simplify-kpf_idle-handling.patch