+ slab-use-memdesc_nid.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: slab: use memdesc_nid()
has been added to the -mm mm-new branch.  Its filename is
     slab-use-memdesc_nid.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/slab-use-memdesc_nid.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.

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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: slab: use memdesc_nid()
Date: Tue, 5 Aug 2025 18:22:56 +0100

We no longer need to convert from slab to folio to get the nid, we can ask
memdesc_nid() for the nid directly.

Link: https://lkml.kernel.org/r/20250805172307.1302730-7-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Cc: Shakeel Butt <shakeel.butt@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/slab.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/mm/slab.h~slab-use-memdesc_nid
+++ a/mm/slab.h
@@ -174,12 +174,12 @@ static inline void *slab_address(const s
 
 static inline int slab_nid(const struct slab *slab)
 {
-	return folio_nid(slab_folio(slab));
+	return memdesc_nid(slab->flags);
 }
 
 static inline pg_data_t *slab_pgdat(const struct slab *slab)
 {
-	return folio_pgdat(slab_folio(slab));
+	return NODE_DATA(slab_nid(slab));
 }
 
 static inline struct slab *virt_to_slab(const void *addr)
_

Patches currently in -mm which might be from willy@infradead.org are

mm-introduce-memdesc_flags_t.patch
mm-convert-page_to_section-to-memdesc_section.patch
mm-introduce-memdesc_nid.patch
mm-introduce-memdesc_zonenum.patch
slab-use-memdesc_flags_t.patch
slab-use-memdesc_nid.patch
mm-introduce-memdesc_is_zone_device.patch
mm-reimplement-folio_is_device_private.patch
mm-reimplement-folio_is_device_coherent.patch
mm-reimplement-folio_is_fsdax.patch
mm-add-folio_is_pci_p2pdma.patch