linux-kernel - [RFC PATCH v2 02/12] arch/x86/kernel/amd_gart_64: update usage of address zone modifiers

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Message-Id: <1526916033-4877-3-git-send-email-yehs2007@gmail.com>
Date:   Mon, 21 May 2018 23:20:23 +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>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Robin Murphy <robin.murphy@....com>
Subject: [RFC PATCH v2 02/12] arch/x86/kernel/amd_gart_64: 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: Thomas Gleixner <tglx@...utronix.de>
Cc: Ingo Molnar <mingo@...hat.com>
Cc: "H. Peter Anvin" <hpa@...or.com>
Cc: Robin Murphy <robin.murphy@....com>
---
 arch/x86/kernel/amd_gart_64.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
index ecd486c..1dd6971 100644
--- a/arch/x86/kernel/amd_gart_64.c
+++ b/arch/x86/kernel/amd_gart_64.c
@@ -485,7 +485,7 @@ static int gart_map_sg(struct device *dev, struct scatterlist *sg, int nents,
 	struct page *page;
 
 	if (force_iommu && !(flag & GFP_DMA)) {
-		flag &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
+		flag &= ~__GFP_ZONE_MASK;
 		page = alloc_pages(flag | __GFP_ZERO, get_order(size));
 		if (!page)
 			return NULL;
-- 
1.8.3.1