linux-kernel - [RFC PATCH v2 05/12] include/linux/dma-mapping: update usage of address zone modifiers

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Date:   Mon, 21 May 2018 23:20:26 +0800
From:   Huaisheng Ye <yehs2007@...il.com>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org
Cc:     mhocko@...e.com, willy@...radead.org, vbabka@...e.cz,
        mgorman@...hsingularity.net, kstewart@...uxfoundation.org,
        alexander.levin@...izon.com, gregkh@...uxfoundation.org,
        colyli@...e.de, chengnt@...ovo.com, hehy1@...ovo.com,
        linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org,
        xen-devel@...ts.xenproject.org, linux-btrfs@...r.kernel.org,
        Huaisheng Ye <yehs1@...ovo.com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>
Subject: [RFC PATCH v2 05/12] include/linux/dma-mapping: update usage of address zone modifiers

From: Huaisheng Ye <yehs1@...ovo.com>

Use __GFP_ZONE_MASK to replace (__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32).

___GFP_DMA, ___GFP_HIGHMEM and ___GFP_DMA32 have been deleted from GFP
bitmasks, the bottom three bits of GFP mask is reserved for storing
encoded zone number.
__GFP_DMA, __GFP_HIGHMEM and __GFP_DMA32 should not be operated with
each others by OR.

Signed-off-by: Huaisheng Ye <yehs1@...ovo.com>
Cc: Christoph Hellwig <hch@....de>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
Cc: Robin Murphy <robin.murphy@....com>
---
 include/linux/dma-mapping.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index eb9eab4..3da0293 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -523,7 +523,7 @@ static inline void *dma_alloc_attrs(struct device *dev, size_t size,
 	 * decide on the way of zeroing the memory given that the memory
 	 * returned should always be zeroed.
 	 */
-	flag &= ~(__GFP_DMA | __GFP_DMA32 | __GFP_HIGHMEM | __GFP_ZERO);
+	flag &= ~(__GFP_ZONE_MASK | __GFP_ZERO);
 
 	if (!arch_dma_alloc_attrs(&dev, &flag))
 		return NULL;
-- 
1.8.3.1