linux-kernel - [RFC PATCH v3 4/9] fs/btrfs/extent_io: update usage of zone modifiers

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Date:   Thu, 24 May 2018 00:57:19 +0800
From:   Huaisheng Ye <yehs2007@...il.com>
To:     akpm@...ux-foundation.org, linux-mm@...ck.org
Cc:     mhocko@...e.com, willy@...radead.org, hch@....de, vbabka@...e.cz,
        mgorman@...hsingularity.net, kstewart@...uxfoundation.org,
        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>,
        Chris Mason <clm@...com>, Josef Bacik <jbacik@...com>,
        David Sterba <dsterba@...e.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: [RFC PATCH v3 4/9] fs/btrfs/extent_io: update usage of zone modifiers

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

Use __GFP_ZONE_MASK to replace (__GFP_DMA32 | __GFP_HIGHMEM).

In function alloc_extent_state, it is obvious that __GFP_DMA is not
the expecting zone type.

___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.

Use GFP_NORMAL() to clear bottom 3 bits of GFP bitmaks.

Signed-off-by: Huaisheng Ye <yehs1@...ovo.com>
Cc: Chris Mason <clm@...com>
Cc: Josef Bacik <jbacik@...com>
Cc: David Sterba <dsterba@...e.com>
Cc: Christoph Hellwig <hch@...radead.org>
---
 fs/btrfs/extent_io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index e99b329..f41fc61 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -220,7 +220,7 @@ static struct extent_state *alloc_extent_state(gfp_t mask)
 	 * The given mask might be not appropriate for the slab allocator,
 	 * drop the unsupported bits
 	 */
-	mask &= ~(__GFP_DMA32|__GFP_HIGHMEM);
+	mask = GFP_NORMAL(mask);
 	state = kmem_cache_alloc(extent_state_cache, mask);
 	if (!state)
 		return state;
-- 
1.8.3.1