+ mm-page_alloc-add-__alloc_frozen_pages.patch added to mm-unstable branch

+ mm-page_alloc-add-__alloc_frozen_pages.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/page_alloc: add __alloc_frozen_pages()
has been added to the -mm mm-unstable branch.  Its filename is
     mm-page_alloc-add-__alloc_frozen_pages.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_alloc-add-__alloc_frozen_pages.patch

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

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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: mm/page_alloc: add __alloc_frozen_pages()
Date: Mon, 25 Nov 2024 21:01:45 +0000

Defer the initialisation of the page refcount to the new __alloc_pages()
wrapper and turn the old __alloc_pages() into __alloc_frozen_pages().

Link: https://lkml.kernel.org/r/20241125210149.2976098-14-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: Mel Gorman <mgorman@techsinguularity.net>
Cc: Miaohe Lin <linmiaohe@huawei.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: William Kucharski <william.kucharski@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/internal.h   |    4 ++++
 mm/page_alloc.c |   18 ++++++++++++++----
 2 files changed, 18 insertions(+), 4 deletions(-)

--- a/mm/internal.h~mm-page_alloc-add-__alloc_frozen_pages
+++ a/mm/internal.h
@@ -740,6 +740,10 @@ extern bool free_pages_prepare(struct pa
 
 extern int user_min_free_kbytes;
 
+struct page *__alloc_frozen_pages_noprof(gfp_t, unsigned int order, int nid,
+		nodemask_t *);
+#define __alloc_frozen_pages(...) \
+	alloc_hooks(__alloc_frozen_pages_noprof(__VA_ARGS__))
 void free_frozen_pages(struct page *page, unsigned int order);
 void free_unref_folios(struct folio_batch *fbatch);
 
--- a/mm/page_alloc.c~mm-page_alloc-add-__alloc_frozen_pages
+++ a/mm/page_alloc.c
@@ -4711,8 +4711,8 @@ EXPORT_SYMBOL_GPL(alloc_pages_bulk_nopro
 /*
  * This is the 'heart' of the zoned buddy allocator.
  */
-struct page *__alloc_pages_noprof(gfp_t gfp, unsigned int order,
-				      int preferred_nid, nodemask_t *nodemask)
+struct page *__alloc_frozen_pages_noprof(gfp_t gfp, unsigned int order,
+		int preferred_nid, nodemask_t *nodemask)
 {
 	struct page *page;
 	unsigned int alloc_flags = ALLOC_WMARK_LOW;
@@ -4768,14 +4768,24 @@ out:
 		free_frozen_pages(page, order);
 		page = NULL;
 	}
-	if (page)
-		set_page_refcounted(page);
 
 	trace_mm_page_alloc(page, order, alloc_gfp, ac.migratetype);
 	kmsan_alloc_page(page, order, alloc_gfp);
 
 	return page;
 }
+EXPORT_SYMBOL(__alloc_frozen_pages_noprof);
+
+struct page *__alloc_pages_noprof(gfp_t gfp, unsigned int order,
+		int preferred_nid, nodemask_t *nodemask)
+{
+	struct page *page;
+
+	page = __alloc_frozen_pages_noprof(gfp, order, preferred_nid, nodemask);
+	if (page)
+		set_page_refcounted(page);
+	return page;
+}
 EXPORT_SYMBOL(__alloc_pages_noprof);
 
 struct folio *__folio_alloc_noprof(gfp_t gfp, unsigned int order, int preferred_nid,
_

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

mm-page_alloc-cache-page_zone-result-in-free_unref_page.patch
mm-make-alloc_pages_mpol-static.patch
mm-page_alloc-export-free_frozen_pages-instead-of-free_unref_page.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-post_alloc_hook.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-prep_new_page.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-get_page_from_freelist.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_cpuset_fallback.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_may_oom.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_direct_compact.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_direct_reclaim.patch
mm-page_alloc-move-set_page_refcounted-to-callers-of-__alloc_pages_slowpath.patch
mm-page_alloc-move-set_page_refcounted-to-end-of-__alloc_pages.patch
mm-page_alloc-add-__alloc_frozen_pages.patch
mm-mempolicy-add-alloc_frozen_pages.patch
slab-allocate-frozen-pages.patch