linux-kernel - [PATCH v2 1/2] mm/hugetlb: convert dissolve_free_huge

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Date: Fri, 12 Apr 2024 11:21:38 -0700
From: Sidhartha Kumar <sidhartha.kumar@...cle.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: akpm@...ux-foundation.org, willy@...radead.org, linmiaohe@...wei.com,
        jane.chu@...cle.com, muchun.song@...ux.dev, nao.horiguchi@...il.com,
        osalvador@...e.de, Sidhartha Kumar <sidhartha.kumar@...cle.com>
Subject: [PATCH v2 1/2] mm/hugetlb: convert dissolve_free_huge_pages() to folios

Allows us to rename dissolve_free_huge_pages() to
dissolve_free_hugetlb_folio(). Convert one caller to pass in a folio
directly and use page_folio() to convert the caller in mm/memory-failure.

Signed-off-by: Sidhartha Kumar <sidhartha.kumar@...cle.com>
Reviewed-by: Oscar Salvador <osalvador@...e.de>
---

v1 -> v2:
	- Change additional comments which reference hugepages to
	  hugetlb folios per Miaohe Lin. 
	- introduce patch 2

 include/linux/hugetlb.h |  4 ++--
 mm/hugetlb.c            | 17 ++++++++---------
 mm/memory-failure.c     |  8 ++++----
 3 files changed, 14 insertions(+), 15 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 3f3e628802792..f4191b10345d6 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -861,7 +861,7 @@ static inline int hstate_index(struct hstate *h)
 	return h - hstates;
 }
 
-extern int dissolve_free_huge_page(struct page *page);
+extern int dissolve_free_hugetlb_folio(struct folio *folio);
 extern int dissolve_free_huge_pages(unsigned long start_pfn,
 				    unsigned long end_pfn);
 
@@ -1148,7 +1148,7 @@ static inline int hstate_index(struct hstate *h)
 	return 0;
 }
 
-static inline int dissolve_free_huge_page(struct page *page)
+static inline int dissolve_free_hugetlb_folio(struct folio *folio)
 {
 	return 0;
 }
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 454900c84b303..f6dd5f597df16 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2377,8 +2377,8 @@ static struct folio *remove_pool_hugetlb_folio(struct hstate *h,
 }
 
 /*
- * Dissolve a given free hugepage into free buddy pages. This function does
- * nothing for in-use hugepages and non-hugepages.
+ * Dissolve a given free hugetlb folio into free buddy pages. This function
+ * does nothing for in-use hugetlb folios and non-hugetlb folios.
  * This function returns values like below:
  *
  *  -ENOMEM: failed to allocate vmemmap pages to free the freed hugepages
@@ -2390,10 +2390,9 @@ static struct folio *remove_pool_hugetlb_folio(struct hstate *h,
  *       0:  successfully dissolved free hugepages or the page is not a
  *           hugepage (considered as already dissolved)
  */
-int dissolve_free_huge_page(struct page *page)
+int dissolve_free_hugetlb_folio(struct folio *folio)
 {
 	int rc = -EBUSY;
-	struct folio *folio = page_folio(page);
 
 retry:
 	/* Not to disrupt normal path by vainly holding hugetlb_lock */
@@ -2470,13 +2469,13 @@ int dissolve_free_huge_page(struct page *page)
  * make specified memory blocks removable from the system.
  * Note that this will dissolve a free gigantic hugepage completely, if any
  * part of it lies within the given range.
- * Also note that if dissolve_free_huge_page() returns with an error, all
- * free hugepages that were dissolved before that error are lost.
+ * Also note that if dissolve_free_hugetlb_folio() returns with an error, all
+ * free hugetlb folios that were dissolved before that error are lost.
  */
 int dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn)
 {
 	unsigned long pfn;
-	struct page *page;
+	struct folio *folio;
 	int rc = 0;
 	unsigned int order;
 	struct hstate *h;
@@ -2489,8 +2488,8 @@ int dissolve_free_huge_pages(unsigned long start_pfn, unsigned long end_pfn)
 		order = min(order, huge_page_order(h));
 
 	for (pfn = start_pfn; pfn < end_pfn; pfn += 1 << order) {
-		page = pfn_to_page(pfn);
-		rc = dissolve_free_huge_page(page);
+		folio = pfn_folio(pfn);
+		rc = dissolve_free_hugetlb_folio(folio);
 		if (rc)
 			break;
 	}
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 88359a185c5f9..8cc91aa1a3f47 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -155,11 +155,11 @@ static int __page_handle_poison(struct page *page)
 
 	/*
 	 * zone_pcp_disable() can't be used here. It will hold pcp_batch_high_lock and
-	 * dissolve_free_huge_page() might hold cpu_hotplug_lock via static_key_slow_dec()
+	 * dissolve_free_hugetlb_folio() might hold cpu_hotplug_lock via static_key_slow_dec()
 	 * when hugetlb vmemmap optimization is enabled. This will break current lock
 	 * dependency chain and leads to deadlock.
 	 */
-	ret = dissolve_free_huge_page(page);
+	ret = dissolve_free_hugetlb_folio(page_folio(page));
 	if (!ret) {
 		drain_all_pages(page_zone(page));
 		ret = take_page_off_buddy(page);
@@ -172,8 +172,8 @@ static bool page_handle_poison(struct page *page, bool hugepage_or_freepage, boo
 {
 	if (hugepage_or_freepage) {
 		/*
-		 * Doing this check for free pages is also fine since dissolve_free_huge_page
-		 * returns 0 for non-hugetlb pages as well.
+		 * Doing this check for free pages is also fine since
+		 * dissolve_free_hugetlb_folio() returns 0 for non-hugetlb folios as well.
 		 */
 		if (__page_handle_poison(page) <= 0)
 			/*
-- 
2.44.0