mm: page_alloc: add alloc_contig_frozen_{range,pages}()

In order to allocate given range of pages or allocate compound pages
without incrementing their refcount, adding two new helper
alloc_contig_frozen_{range,pages}() which may be beneficial to some users
(eg hugetlb).

The new alloc_contig_{range,pages} only take !__GFP_COMP gfp now, and the
free_contig_range() is refactored to only free non-compound pages, the
only caller to free compound pages in cma_free_folio() is changed
accordingly, and the free_contig_frozen_range() is provided to match the
alloc_contig_frozen_range(), which is used to free frozen pages.

Link: https://lkml.kernel.org/r/20260109093136.1491549-5-wangkefeng.wang@huawei.com
Signed-off-by: Kefeng Wang <wangkefeng.wang@huawei.com>
Reviewed-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Sidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Brendan Jackman <jackmanb@google.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Cc: Mark Brown <broonie@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

1 files changed, 21 insertions, 31 deletions

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 627157972f6a..6ecf6dda93e0 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -436,40 +436,30 @@ typedef unsigned int __bitwise acr_flags_t;
 #define ACR_FLAGS_CMA ((__force acr_flags_t)BIT(0)) // allocate for CMA
 
 /* The below functions must be run on a range from a single zone. */
-extern int alloc_contig_range_noprof(unsigned long start, unsigned long end,
-				     acr_flags_t alloc_flags, gfp_t gfp_mask);
-#define alloc_contig_range(...)			alloc_hooks(alloc_contig_range_noprof(__VA_ARGS__))
-
-extern struct page *alloc_contig_pages_noprof(unsigned long nr_pages, gfp_t gfp_mask,
-					      int nid, nodemask_t *nodemask);
-#define alloc_contig_pages(...)			alloc_hooks(alloc_contig_pages_noprof(__VA_ARGS__))
-
+int alloc_contig_frozen_range_noprof(unsigned long start, unsigned long end,
+		acr_flags_t alloc_flags, gfp_t gfp_mask);
+#define alloc_contig_frozen_range(...)	\
+	alloc_hooks(alloc_contig_frozen_range_noprof(__VA_ARGS__))
+
+int alloc_contig_range_noprof(unsigned long start, unsigned long end,
+		acr_flags_t alloc_flags, gfp_t gfp_mask);
+#define alloc_contig_range(...)	\
+	alloc_hooks(alloc_contig_range_noprof(__VA_ARGS__))
+
+struct page *alloc_contig_frozen_pages_noprof(unsigned long nr_pages,
+		gfp_t gfp_mask, int nid, nodemask_t *nodemask);
+#define alloc_contig_frozen_pages(...) \
+	alloc_hooks(alloc_contig_frozen_pages_noprof(__VA_ARGS__))
+
+struct page *alloc_contig_pages_noprof(unsigned long nr_pages, gfp_t gfp_mask,
+		int nid, nodemask_t *nodemask);
+#define alloc_contig_pages(...)	\
+	alloc_hooks(alloc_contig_pages_noprof(__VA_ARGS__))
+
+void free_contig_frozen_range(unsigned long pfn, unsigned long nr_pages);
 void free_contig_range(unsigned long pfn, unsigned long nr_pages);
 #endif
 
-#ifdef CONFIG_CONTIG_ALLOC
-static inline struct folio *folio_alloc_gigantic_noprof(int order, gfp_t gfp,
-							int nid, nodemask_t *node)
-{
-	struct page *page;
-
-	if (WARN_ON(!order || !(gfp & __GFP_COMP)))
-		return NULL;
-
-	page = alloc_contig_pages_noprof(1 << order, gfp, nid, node);
-
-	return page ? page_folio(page) : NULL;
-}
-#else
-static inline struct folio *folio_alloc_gigantic_noprof(int order, gfp_t gfp,
-							int nid, nodemask_t *node)
-{
-	return NULL;
-}
-#endif
-/* This should be paired with folio_put() rather than free_contig_range(). */
-#define folio_alloc_gigantic(...) alloc_hooks(folio_alloc_gigantic_noprof(__VA_ARGS__))
-
 DEFINE_FREE(free_page, void *, free_page((unsigned long)_T))
 
 #endif /* __LINUX_GFP_H */