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hugetlb: remove PageHeadHuge()

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Sidhartha Kumar removed the last caller of PageHeadHuge(), so we can now
remove it and make folio_test_hugetlb() the real implementation.  Add
kernel-doc for folio_test_hugetlb().

Link: https://lkml.kernel.org/r/20230327151050.1787744-1-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-03-27 16:10:50 +01:00 committed by Andrew Morton
parent 4519a254e0
commit 957ebbdf43
2 changed files with 12 additions and 13 deletions
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7
include/linux/page-flags.h
View File

@ -815,14 +815,9 @@ static inline void ClearPageCompound(struct page *page)
#ifdef CONFIG_HUGETLB_PAGE
int PageHuge(struct page *page);
int PageHeadHuge(struct page *page);
static inline bool folio_test_hugetlb(struct folio *folio)
{
return PageHeadHuge(&folio->page);
}
bool folio_test_hugetlb(struct folio *folio);
#else
TESTPAGEFLAG_FALSE(Huge, hugetlb)
TESTPAGEFLAG_FALSE(HeadHuge, headhuge)
#endif
#ifdef CONFIG_TRANSPARENT_HUGEPAGE

18
mm/hugetlb.c
View File

@ -2050,19 +2050,23 @@ int PageHuge(struct page *page)
}
EXPORT_SYMBOL_GPL(PageHuge);
/*
* PageHeadHuge() only returns true for hugetlbfs head page, but not for
* normal or transparent huge pages.
/**
* folio_test_hugetlb - Determine if the folio belongs to hugetlbfs
* @folio: The folio to test.
*
* Context: Any context. Caller should have a reference on the folio to
* prevent it from being turned into a tail page.
* Return: True for hugetlbfs folios, false for anon folios or folios
* belonging to other filesystems.
*/
int PageHeadHuge(struct page *page_head)
bool folio_test_hugetlb(struct folio *folio)
{
struct folio *folio = (struct folio *)page_head;
if (!folio_test_large(folio))
return 0;
return false;
return folio->_folio_dtor == HUGETLB_PAGE_DTOR;
}
EXPORT_SYMBOL_GPL(PageHeadHuge);
EXPORT_SYMBOL_GPL(folio_test_hugetlb);
/*
* Find and lock address space (mapping) in write mode.