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mm: factor out large folio handling from folio_nr_pages() into folio_large_nr_pages()

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Let's factor it out into a simple helper function.  This helper will also
come in handy when working with code where we know that our folio is
large.

While at it, let's consistently return a "long" value from all these
similar functions.  Note that we cannot use "unsigned int" (even though
_folio_nr_pages is of that type), because it would break some callers that
do stuff like "-folio_nr_pages()".  Both "int" or "unsigned long" would
work as well.

Maybe in the future we'll have the nr_pages readily available for all
large folios, maybe even for small folios, or maybe for none.

Link: https://lkml.kernel.org/r/20250303163014.1128035-3-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andy Lutomirks^H^Hski <luto@kernel.org>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcow (Oracle) <willy@infradead.org>
Cc: Michal Koutn <mkoutny@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: tejun heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zefan Li <lizefan.x@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
David Hildenbrand 2025-03-03 17:29:55 +01:00 • committed by Andrew Morton
parent 6220ea5583
commit 1ea5212aed
1 changed files with 16 additions and 12 deletions
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28
include/linux/mm.h
View file

@ -1199,6 +1199,18 @@ static inline unsigned int folio_large_order(const struct folio *folio)
return folio->_flags_1 & 0xff;
}
#ifdef CONFIG_64BIT
static inline long folio_large_nr_pages(const struct folio *folio)
{
return folio->_folio_nr_pages;
}
#else
static inline long folio_large_nr_pages(const struct folio *folio)
{
return 1L << folio_large_order(folio);
}
#endif
/*
* compound_order() can be called without holding a reference, which means
* that niceties like page_folio() don't work. These callers should be
@ -2147,11 +2159,7 @@ static inline long folio_nr_pages(const struct folio *folio)
{
if (!folio_test_large(folio))
return 1;
#ifdef CONFIG_64BIT
return folio->_folio_nr_pages;
#else
return 1L << folio_large_order(folio);
#endif
return folio_large_nr_pages(folio);
}
/* Only hugetlbfs can allocate folios larger than MAX_ORDER */
@ -2166,24 +2174,20 @@ static inline long folio_nr_pages(const struct folio *folio)
* page. compound_nr() can be called on a tail page, and is defined to
* return 1 in that case.
*/
static inline unsigned long compound_nr(struct page *page)
static inline long compound_nr(struct page *page)
{
struct folio *folio = (struct folio *)page;
if (!test_bit(PG_head, &folio->flags))
return 1;
#ifdef CONFIG_64BIT
return folio->_folio_nr_pages;
#else
return 1L << folio_large_order(folio);
#endif
return folio_large_nr_pages(folio);
}
/**
* thp_nr_pages - The number of regular pages in this huge page.
* @page: The head page of a huge page.
*/
static inline int thp_nr_pages(struct page *page)
static inline long thp_nr_pages(struct page *page)
{
return folio_nr_pages((struct folio *)page);
}