mm/hugetlb.c: 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.

[[email protected]: s/EXPORT_SYMBOL/EXPORT_SYMBOL_GPL/, per Christoph]

Link: https://lkml.kernel.org/r/[email protected]
Link: https://lore.kernel.org/r/163707085314.3221130.14783857863702203440.stgit@warthog.procyon.org.uk/
Signed-off-by: David Howells <[email protected]>
Cc: Matthew Wilcox (Oracle) <[email protected]>
Cc: Kirill A. Shutemov <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Mike Kravetz <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions