linux-kernel - [RFC PATCH v2 04/12] drivers/iommu/amd_iommu: update usage of address zone modifiers

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Date:   Mon, 21 May 2018 23:20:25 +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>, Joerg Roedel <joro@...tes.org>
Subject: [RFC PATCH v2 04/12] drivers/iommu/amd_iommu: 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 by OR.

Signed-off-by: Huaisheng Ye <yehs1@...ovo.com>
Cc: Joerg Roedel <joro@...tes.org>
---
 drivers/iommu/amd_iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 74788fd..3921d53 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -2614,7 +2614,7 @@ static void *alloc_coherent(struct device *dev, size_t size,
 	dma_dom   = to_dma_ops_domain(domain);
 	size	  = PAGE_ALIGN(size);
 	dma_mask  = dev->coherent_dma_mask;
-	flag     &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
+	flag     &= ~__GFP_ZONE_MASK;
 	flag     |= __GFP_ZERO;
 
 	page = alloc_pages(flag | __GFP_NOWARN,  get_order(size));
-- 
1.8.3.1