linux-kernel - [PATCH v2 4/9] staging: ion: use compound pages on high order pages for system heap

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Date:	Wed, 28 May 2014 15:52:55 +0900
From:	Heesub Shin <heesub.shin@...sung.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	John Stultz <john.stultz@...aro.org>,
	Rebecca Schultz Zavin <rebecca@...roid.com>,
	Colin Cross <ccross@...roid.com>,
	Arve Hjønnevåg <arve@...roid.com>,
	Mitchel Humpherys <mitchelh@...eaurora.org>,
	Daeseok Youn <daeseok.youn@...il.com>,
	Sunghwan Yun <sunghwan.yun@...sung.com>,
	Dongjun Shin <d.j.shin@...sung.com>,
	devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
	Heesub Shin <heesub.shin@...sung.com>
Subject: [PATCH v2 4/9] staging: ion: use compound pages on high order pages
 for system heap

Using compound pages relieves burden on tracking the meta information
which are currently stored in page_info.

Signed-off-by: Heesub Shin <heesub.shin@...sung.com>
---
 drivers/staging/android/ion/ion_page_pool.c   | 4 +++-
 drivers/staging/android/ion/ion_system_heap.c | 2 +-
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
index 111777c..c1cea42b 100644
--- a/drivers/staging/android/ion/ion_page_pool.c
+++ b/drivers/staging/android/ion/ion_page_pool.c
@@ -95,6 +95,8 @@ void ion_page_pool_free(struct ion_page_pool *pool, struct page *page)
 {
 	int ret;
 
+	BUG_ON(pool->order != compound_order(page));
+
 	ret = ion_page_pool_add(pool, page);
 	if (ret)
 		ion_page_pool_free_pages(pool, page);
@@ -150,7 +152,7 @@ struct ion_page_pool *ion_page_pool_create(gfp_t gfp_mask, unsigned int order)
 	pool->low_count = 0;
 	INIT_LIST_HEAD(&pool->low_items);
 	INIT_LIST_HEAD(&pool->high_items);
-	pool->gfp_mask = gfp_mask;
+	pool->gfp_mask = gfp_mask | __GFP_COMP;
 	pool->order = order;
 	mutex_init(&pool->mutex);
 	plist_node_init(&pool->list, order);
diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index b554751..48e6a58 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -72,7 +72,7 @@ static struct page *alloc_buffer_page(struct ion_system_heap *heap,
 
 		if (order > 4)
 			gfp_flags = high_order_gfp_flags;
-		page = alloc_pages(gfp_flags, order);
+		page = alloc_pages(gfp_flags | __GFP_COMP, order);
 		if (!page)
 			return NULL;
 		ion_pages_sync_for_device(NULL, page, PAGE_SIZE << order,
-- 
1.9.1

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