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Date:   Tue,  6 Jun 2023 19:03:46 +0000
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Subject: [RFC PATCH 01/19] mm: hugetlb: Expose get_hstate_idx()
From:   Ackerley Tng <ackerleytng@google.com>
To:     akpm@linux-foundation.org, mike.kravetz@oracle.com,
        muchun.song@linux.dev, pbonzini@redhat.com, seanjc@google.com,
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        Ackerley Tng <ackerleytng@google.com>
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Expose get_hstate_idx() so it can be used from KVM's guest_mem code

Signed-off-by: Ackerley Tng <ackerleytng@google.com>
---
 fs/hugetlbfs/inode.c    |  9 ---------
 include/linux/hugetlb.h | 14 ++++++++++++++
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 9062da6da567..406d7366cf3e 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1560,15 +1560,6 @@ static int can_do_hugetlb_shm(void)
 	return capable(CAP_IPC_LOCK) || in_group_p(shm_group);
 }
 
-static int get_hstate_idx(int page_size_log)
-{
-	struct hstate *h = hstate_sizelog(page_size_log);
-
-	if (!h)
-		return -1;
-	return hstate_index(h);
-}
-
 /*
  * Note that size should be aligned to proper hugepage size in caller side,
  * otherwise hugetlb_reserve_pages reserves one less hugepages than intended.
diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
index 7c977d234aba..37c2edf7beea 100644
--- a/include/linux/hugetlb.h
+++ b/include/linux/hugetlb.h
@@ -876,6 +876,15 @@ static inline int hstate_index(struct hstate *h)
 	return h - hstates;
 }
 
+static inline int get_hstate_idx(int page_size_log)
+{
+	struct hstate *h = hstate_sizelog(page_size_log);
+
+	if (!h)
+		return -1;
+	return hstate_index(h);
+}
+
 extern int dissolve_free_huge_page(struct page *page);
 extern int dissolve_free_huge_pages(unsigned long start_pfn,
 				    unsigned long end_pfn);
@@ -1142,6 +1151,11 @@ static inline int hstate_index(struct hstate *h)
 	return 0;
 }
 
+static inline int get_hstate_idx(int page_size_log)
+{
+	return 0;
+}
+
 static inline int dissolve_free_huge_page(struct page *page)
 {
 	return 0;
-- 
2.41.0.rc0.172.g3f132b7071-goog