linux-kernel - [PATCH] mm: Export PageHeadHuge()

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Date:   Mon, 28 Feb 2022 13:22:56 +0000
From:   David Howells <dhowells@...hat.com>
To:     torvalds@...ux-foundation.org, akpm@...ux-foundation.org
cc:     dhowells@...hat.com, willy@...radead.org, kirill@...temov.name,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH] mm: Export PageHeadHuge()

Export PageHeadHuge() - it's used by folio_test_hugetlb() and thence by
such as folio_file_page() and folio_contains().  Matthew suggested I use
the first of those instead of doing the same calculation manually - but
I can't call it from a module.

Kirill suggested rearranging things to put it in a header, but that
introduces header dependencies because of where constants are defined.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: willy@...radead.org
Link: https://lore.kernel.org/r/163707085314.3221130.14783857863702203440.stgit@warthog.procyon.org.uk/

---
 mm/hugetlb.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 61895cc01d09..5768df43b05c 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1854,6 +1854,7 @@ int PageHeadHuge(struct page *page_head)

 	return page_head[1].compound_dtor == HUGETLB_PAGE_DTOR;
 }
+EXPORT_SYMBOL(PageHeadHuge);

 /*
  * Find and lock address space (mapping) in write mode.