linux-kernel - [PATCH 08/25] mm: Add __alloc_folio_node and alloc

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Message-Id: <20201216182335.27227-9-willy@infradead.org>
Date:   Wed, 16 Dec 2020 18:23:18 +0000
From:   "Matthew Wilcox (Oracle)" <willy@...radead.org>
To:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Cc:     "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 08/25] mm: Add __alloc_folio_node and alloc_folio

These wrappers are mostly for typesafety, but they also ensure that
the page allocator allocates a compound page.

Signed-off-by: Matthew Wilcox (Oracle) <willy@...radead.org>
---
 include/linux/gfp.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 53caa9846854..9e416efb4ff8 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -524,6 +524,12 @@ __alloc_pages_node(int nid, gfp_t gfp_mask, unsigned int order)
 	return __alloc_pages(gfp_mask, order, nid);
 }
 
+static inline
+struct folio *__alloc_folio_node(int nid, gfp_t gfp, unsigned int order)
+{
+	return (struct folio *)__alloc_pages_node(nid, gfp | __GFP_COMP, order);
+}
+
 /*
  * Allocate pages, preferring the node given as nid. When nid == NUMA_NO_NODE,
  * prefer the current CPU's closest node. Otherwise node must be valid and
@@ -565,6 +571,11 @@ static inline struct page *alloc_pages(gfp_t gfp_mask, unsigned int order)
 #define alloc_page_vma(gfp_mask, vma, addr)			\
 	alloc_pages_vma(gfp_mask, 0, vma, addr, numa_node_id(), false)
 
+static inline struct folio *alloc_folio(gfp_t gfp, unsigned int order)
+{
+	return (struct folio *)alloc_pages(gfp | __GFP_COMP, order);
+}
+
 extern unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order);
 extern unsigned long get_zeroed_page(gfp_t gfp_mask);
 
-- 
2.29.2