From: Pintu Kumar <pintu.k@samsung.com>
To: akpm@linux-foundation.org, gregkh@linuxfoundation.org,
        john.stultz@linaro.org, rebecca@android.com, ccross@android.com,
        heesub.shin@samsung.com, devel@driverdev.osuosl.org,
        linux-kernel@vger.kernel.org
Cc: cpgs@samsung.com, pintu.k@samsung.com, pintu_agarwal@yahoo.com,
        vishnu.ps@samsung.com, iqbal.ams@samsung.com
Subject: [PATCH 1/1] [ion]: system-heap use PAGE_ALLOC_COSTLY_ORDER for high
 order
Date: Mon, 06 Oct 2014 14:01:03 +0530
Message-id: <1412584263-22531-1-git-send-email-pintu.k@samsung.com>
DLP-Filter: Pass
Sender: linux-kernel-owner@vger.kernel.org

The Android ion_system_heap uses allocation fallback mechanism
based on 8,4,0 order pages available in the system.
It changes gfp flags based on higher order allocation request.
This higher order value is hard-coded as 4, instead of using
the system defined higher order value.
Thus replacing this hard-coded value with PAGE_ALLOC_COSTLY_ORDER
which is defined as 3.
This will help mapping the higher order request in system heap with
the actual allocation request.

Signed-off-by: Pintu Kumar <pintu.k@samsung.com>
---
 drivers/staging/android/ion/ion_system_heap.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/android/ion/ion_system_heap.c b/drivers/staging/android/ion/ion_system_heap.c
index da2a63c..e6c393f 100644
--- a/drivers/staging/android/ion/ion_system_heap.c
+++ b/drivers/staging/android/ion/ion_system_heap.c
@@ -65,7 +65,7 @@ static struct page *alloc_buffer_page(struct ion_system_heap *heap,
 	} else {
 		gfp_t gfp_flags = low_order_gfp_flags;
 
-		if (order > 4)
+		if (order > PAGE_ALLOC_COSTLY_ORDER)
 			gfp_flags = high_order_gfp_flags;
 		page = alloc_pages(gfp_flags | __GFP_COMP, order);
 		if (!page)
@@ -276,7 +276,7 @@ struct ion_heap *ion_system_heap_create(struct ion_platform_heap *unused)
 		struct ion_page_pool *pool;
 		gfp_t gfp_flags = low_order_gfp_flags;
 
-		if (orders[i] > 4)
+		if (orders[i] > PAGE_ALLOC_COSTLY_ORDER)
 			gfp_flags = high_order_gfp_flags;
 		pool = ion_page_pool_create(gfp_flags, orders[i]);
 		if (!pool)
-- 
1.7.9.5

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