+ mm-mglru-make-lru-folio-prefetch-helper-an-inline-function.patch added to mm-new branch

+ mm-mglru-make-lru-folio-prefetch-helper-an-inline-function.patch added to mm-new branch

[Andrew Morton]

The patch titled
     Subject: mm/mglru: make LRU folio prefetch helper an inline function
has been added to the -mm mm-new branch.  Its filename is
     mm-mglru-make-lru-folio-prefetch-helper-an-inline-function.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-mglru-make-lru-folio-prefetch-helper-an-inline-function.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: "Barry Song (Xiaomi)" <baohua@kernel.org>
Subject: mm/mglru: make LRU folio prefetch helper an inline function
Date: Wed, 2 Sep 2026 07:24:19 +0800

`prefetchw_prev_lru_folio()` is currently implemented as a macro with a
potentially unused argument.  This makes the helper harder to read and can
also trigger checkpatch warnings about unused macro arguments.

Make it a `static inline` function and remove the unnecessary `_field`
argument.  The helper always prefetches the previous folio's `flags`, so
there is no need to make the field configurable.

Link: https://lore.kernel.org/20260901232421.40157-6-baohua@kernel.org
Signed-off-by: Barry Song (Xiaomi) <baohua@kernel.org>
Tested-by: Xueyuan Chen <xueyuan.chen21@gmail.com>
Reviewed-by: Lian Wang <lianux.mm@gmail.com>
Cc: Axel Rasmussen <axelrasmussen@google.com>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Baoquan He <baoquan.he@linux.dev>
Cc: David Hildenbrand <david@kernel.org>
Cc: David Stevens <stevensd@chromium.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Kairui Song <kasong@tencent.com>
Cc: Kunwu Chan <kunwu.chan@gmail.com>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Ridong Chen <ridong.chen@linux.dev>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Wei Xu <weixugc@google.com>
Cc: Yuanchu Xie <yuanchu@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/vmscan.c |   26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

--- a/mm/vmscan.c~mm-mglru-make-lru-folio-prefetch-helper-an-inline-function
+++ a/mm/vmscan.c
@@ -182,17 +182,21 @@ struct scan_control {
 };
 
 #ifdef ARCH_HAS_PREFETCHW
-#define prefetchw_prev_lru_folio(_folio, _base, _field)			\
-	do {								\
-		if ((_folio)->lru.prev != _base) {			\
-			struct folio *prev;				\
-									\
-			prev = lru_to_folio(&(_folio->lru));		\
-			prefetchw(&prev->_field);			\
-		}							\
-	} while (0)
+static inline void prefetchw_prev_lru_folio(struct folio *folio,
+		struct list_head *base)
+{
+	if (folio->lru.prev != base) {
+		struct folio *prev;
+
+		prev = lru_to_folio(&folio->lru);
+		prefetchw(&prev->flags);
+	}
+}
 #else
-#define prefetchw_prev_lru_folio(_folio, _base, _field) do { } while (0)
+static inline void prefetchw_prev_lru_folio(struct folio *folio,
+		struct list_head *base)
+{
+}
 #endif
 
 /*
@@ -1700,7 +1704,7 @@ static unsigned long isolate_lru_folios(
 		struct folio *folio;
 
 		folio = lru_to_folio(src);
-		prefetchw_prev_lru_folio(folio, src, flags);
+		prefetchw_prev_lru_folio(folio, src);
 
 		nr_pages = folio_nr_pages(folio);
 		total_scan += nr_pages;
_

Patches currently in -mm which might be from baohua@kernel.org are

mm-mglru-make-retry-logic-explicit-in-isolate_folios.patch
mm-vmscan-avoid-pointless-large-folio-splits-without-swap.patch
mm-mglru-separate-folio-generation-update-from-lru-accounting.patch
mm-mglru-batch-update-lrugen-nr_pages-in-inc_min_seq.patch
mm-mglru-enhance-cold-hot-inversion-handling-in-inc_min_seq.patch
mm-mglru-exclude-folios-promoted-by-aging-from-protected-in-inc_min_seq.patch
mm-mglru-make-lru-folio-prefetch-helper-an-inline-function.patch
mm-mglru-move-folios-from-oldest-gen-to-second-oldest-gen-from-head-to-tail.patch
mm-mglru-batch-move-folios-to-the-second-oldest-gens-lru.patch