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From: Alexander Duyck <>
Subject: [next PATCH v4 2/3] mm: Rename __page_frag functions to __page_frag_cache, drop order from drain
Date: Tue, 03 Jan 2017 18:41:51 -0800
Message-ID: <20170104023954.13451.5678.stgit@localhost.localdomain> (raw)
In-Reply-To: <20170104023620.13451.80691.stgit@localhost.localdomain>

From: Alexander Duyck <>

This patch does two things.

First it goes through and renames the __page_frag prefixed functions to
__page_frag_cache so that we can be clear that we are draining or refilling
the cache, not the frags themselves.

Second we drop the order parameter from __page_frag_cache_drain since we
don't actually need to pass it since all fragments are either order 0 or
must be a compound page.

Signed-off-by: Alexander Duyck <>

v2: No change
v3: No change (in theory)
v4: Pulled out page_frag_alloc rename bits which had leaked through due to me
    trying out reordering some patches in my own queue.

 drivers/net/ethernet/intel/igb/igb_main.c |    6 +++---
 include/linux/gfp.h                       |    3 +--
 mm/page_alloc.c                           |   13 +++++++------
 3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index 594604e09f8d..cb08900c9cf2 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -3964,8 +3964,8 @@ static void igb_clean_rx_ring(struct igb_ring *rx_ring)
-		__page_frag_drain(buffer_info->page, 0,
-				  buffer_info->pagecnt_bias);
+		__page_frag_cache_drain(buffer_info->page,
+					buffer_info->pagecnt_bias);
 		buffer_info->page = NULL;
@@ -6993,7 +6993,7 @@ static struct sk_buff *igb_fetch_rx_buffer(struct igb_ring *rx_ring,
 		dma_unmap_page_attrs(rx_ring->dev, rx_buffer->dma,
-		__page_frag_drain(page, 0, rx_buffer->pagecnt_bias);
+		__page_frag_cache_drain(page, rx_buffer->pagecnt_bias);
 	/* clear contents of rx_buffer */
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index 6238c74e0a01..884080404e24 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -506,8 +506,7 @@ extern struct page *alloc_pages_vma(gfp_t gfp_mask, int order,
 extern void free_hot_cold_page_list(struct list_head *list, bool cold);
 struct page_frag_cache;
-extern void __page_frag_drain(struct page *page, unsigned int order,
-			      unsigned int count);
+extern void __page_frag_cache_drain(struct page *page, unsigned int count);
 extern void *page_frag_alloc(struct page_frag_cache *nc,
 			     unsigned int fragsz, gfp_t gfp_mask);
 extern void page_frag_free(void *addr);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 9534e44308b2..4b0541cd3699 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3904,8 +3904,8 @@ void free_pages(unsigned long addr, unsigned int order)
  * drivers to provide a backing region of memory for use as either an
  * sk_buff->head, or to be used in the "frags" portion of skb_shared_info.
-static struct page *__page_frag_refill(struct page_frag_cache *nc,
-				       gfp_t gfp_mask)
+static struct page *__page_frag_cache_refill(struct page_frag_cache *nc,
+					     gfp_t gfp_mask)
 	struct page *page = NULL;
 	gfp_t gfp = gfp_mask;
@@ -3925,19 +3925,20 @@ static struct page *__page_frag_refill(struct page_frag_cache *nc,
 	return page;
-void __page_frag_drain(struct page *page, unsigned int order,
-		       unsigned int count)
+void __page_frag_cache_drain(struct page *page, unsigned int count)
 	VM_BUG_ON_PAGE(page_ref_count(page) == 0, page);
 	if (page_ref_sub_and_test(page, count)) {
+		unsigned int order = compound_order(page);
 		if (order == 0)
 			free_hot_cold_page(page, false);
 			__free_pages_ok(page, order);
 void *page_frag_alloc(struct page_frag_cache *nc,
 		      unsigned int fragsz, gfp_t gfp_mask)
@@ -3948,7 +3949,7 @@ void *page_frag_alloc(struct page_frag_cache *nc,
 	if (unlikely(!nc->va)) {
-		page = __page_frag_refill(nc, gfp_mask);
+		page = __page_frag_cache_refill(nc, gfp_mask);
 		if (!page)
 			return NULL;

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  parent reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-01-04  2:38 [next PATCH v4 0/3] Page fragment updates Alexander Duyck
2017-01-04  2:39 ` [next PATCH v4 1/3] mm: Rename __alloc_page_frag to page_frag_alloc and __free_page_frag to page_frag_free Alexander Duyck
2017-01-04  2:41 ` Alexander Duyck [this message]
2017-01-04  2:42 ` [next PATCH v4 3/3] mm: Add documentation for page fragment APIs Alexander Duyck
2017-01-06  0:02 ` [next PATCH v4 0/3] Page fragment updates Andrew Morton
2017-01-06  0:07   ` Alexander Duyck

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