linux-kernel - [RFC PATCH 09/39] mm: hugetlb: Expose hugetlb_subpool_{get,put}

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Message-ID: <f8dd00f4bcc4328d440b77bc2ea2c1b75370dd58.1726009989.git.ackerleytng@google.com>
Date: Tue, 10 Sep 2024 23:43:40 +0000
From: Ackerley Tng <ackerleytng@...gle.com>
To: tabba@...gle.com, quic_eberman@...cinc.com, roypat@...zon.co.uk, 
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Subject: [RFC PATCH 09/39] mm: hugetlb: Expose hugetlb_subpool_{get,put}_pages()

This will allow hugetlb subpools to be used by guest_memfd.

Signed-off-by: Ackerley Tng <ackerleytng@...gle.com>
---
 include/linux/hugetlb.h | 3 +++
 mm/hugetlb.c            | 6 ++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index e4a05a421623..907cfbbd9e24 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -119,6 +119,9 @@ struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages,
 						long min_hpages);
 void hugepage_put_subpool(struct hugepage_subpool *spool);
 
+long hugepage_subpool_get_pages(struct hugepage_subpool *spool, long delta);
+long hugepage_subpool_put_pages(struct hugepage_subpool *spool, long delta);
+
 void hugetlb_dup_vma_private(struct vm_area_struct *vma);
 void clear_vma_resv_huge_pages(struct vm_area_struct *vma);
 int move_hugetlb_page_tables(struct vm_area_struct *vma,
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 7e73ebcc0f26..808915108126 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -170,8 +170,7 @@ void hugepage_put_subpool(struct hugepage_subpool *spool)
  * only be different than the passed value (delta) in the case where
  * a subpool minimum size must be maintained.
  */
-static long hugepage_subpool_get_pages(struct hugepage_subpool *spool,
-				      long delta)
+long hugepage_subpool_get_pages(struct hugepage_subpool *spool, long delta)
 {
 	long ret = delta;
 
@@ -215,8 +214,7 @@ static long hugepage_subpool_get_pages(struct hugepage_subpool *spool,
  * The return value may only be different than the passed value (delta)
  * in the case where a subpool minimum size must be maintained.
  */
-static long hugepage_subpool_put_pages(struct hugepage_subpool *spool,
-				       long delta)
+long hugepage_subpool_put_pages(struct hugepage_subpool *spool, long delta)
 {
 	long ret = delta;
 	unsigned long flags;
-- 
2.46.0.598.g6f2099f65c-goog