+ mm-huge_memory-convert-split_huge_pages_all-to-use-a-folio.patch added to mm-unstable branch

+ mm-huge_memory-convert-split_huge_pages_all-to-use-a-folio.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm: huge_memory: convert split_huge_pages_all() to use a folio
has been added to the -mm mm-unstable branch.  Its filename is
     mm-huge_memory-convert-split_huge_pages_all-to-use-a-folio.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-huge_memory-convert-split_huge_pages_all-to-use-a-folio.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: Kefeng Wang <wangkefeng.wang@huawei.com>
Subject: mm: huge_memory: convert split_huge_pages_all() to use a folio
Date: Thu, 29 Dec 2022 20:25:03 +0800

Straightforwardly convert split_huge_pages_all() to use a folio.

Link: https://lkml.kernel.org/r/20221229122503.149083-1-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/huge_memory.c~mm-huge_memory-convert-split_huge_pages_all-to-use-a-folio
+++ a/mm/huge_memory.c
@@ -2935,6 +2935,7 @@ static void split_huge_pages_all(void)
 {
 	struct zone *zone;
 	struct page *page;
+	struct folio *folio;
 	unsigned long pfn, max_zone_pfn;
 	unsigned long total = 0, split = 0;
 
@@ -2947,24 +2948,32 @@ static void split_huge_pages_all(void)
 			int nr_pages;
 
 			page = pfn_to_online_page(pfn);
-			if (!page || !get_page_unless_zero(page))
+			if (!page || PageTail(page))
 				continue;
+			folio = page_folio(page);
+			if (!folio_try_get(folio))
+				continue;
+
+			if (unlikely(page_folio(page) != folio))
+				goto next;
 
-			if (zone != page_zone(page))
+			if (zone != folio_zone(folio))
 				goto next;
 
-			if (!PageHead(page) || PageHuge(page) || !PageLRU(page))
+			if (!folio_test_large(folio)
+				|| folio_test_hugetlb(folio)
+				|| !folio_test_lru(folio))
 				goto next;
 
 			total++;
-			lock_page(page);
-			nr_pages = thp_nr_pages(page);
-			if (!split_huge_page(page))
+			folio_lock(folio);
+			nr_pages = folio_nr_pages(folio);
+			if (!split_folio(folio))
 				split++;
 			pfn += nr_pages - 1;
-			unlock_page(page);
+			folio_unlock(folio);
 next:
-			put_page(page);
+			folio_put(folio);
 			cond_resched();
 		}
 	}
_

Patches currently in -mm which might be from wangkefeng.wang@huawei.com are

mm-hwposion-support-recovery-from-ksm_might_need_to_copy.patch
mm-hwposion-support-recovery-from-ksm_might_need_to_copy-v3.patch
mm-huge_memory-convert-madvise_free_huge_pmd-to-use-a-folio.patch
mm-swap-convert-mark_page_lazyfree-to-folio_mark_lazyfree.patch
mm-page_idle-convert-page-idle-to-use-folios.patch
mm-damon-introduce-damon_get_folio.patch
mm-damon-convert-damon_ptep-pmdp_mkold-to-use-folios.patch
mm-damon-paddr-convert-damon_pa_-to-use-folios.patch
mm-damon-vaddr-convert-damon_young_pmd_entry-to-use-folio.patch
mm-damon-remove-unneed-damon_get_page.patch
mm-damon-vaddr-convert-hugetlb-related-function-to-use-folios.patch
mm-huge_memory-convert-split_huge_pages_all-to-use-a-folio.patch