linux-kernel - [RFC PATCH v3 7/9] mm/zsmalloc: update usage of zone modifiers

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Message-Id: <1527095226-5079-1-git-send-email-yehs2007@gmail.com>
Date:   Thu, 24 May 2018 01:07:06 +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>,
        Minchan Kim <minchan@...nel.org>,
        Nitin Gupta <ngupta@...are.org>,
        Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: [RFC PATCH v3 7/9] mm/zsmalloc: update usage of zone modifiers

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

Use __GFP_ZONE_MOVABLE to replace (__GFP_HIGHMEM | __GFP_MOVABLE).

___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_ZONE_MOVABLE contains encoded ZONE_MOVABLE and __GFP_MOVABLE flag.

With GFP_ZONE_TABLE, __GFP_HIGHMEM ORing __GFP_MOVABLE means gfp_zone
should return ZONE_MOVABLE. In order to keep that compatible with
GFP_ZONE_TABLE, Use GFP_NORMAL_UNMOVABLE() to clear bottom 4 bits of
GFP bitmaks.

Signed-off-by: Huaisheng Ye <yehs1@...ovo.com>
Cc: Minchan Kim <minchan@...nel.org>
Cc: Nitin Gupta <ngupta@...are.org>
Cc: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Cc: Christoph Hellwig <hch@...radead.org>
---
 mm/zsmalloc.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
index 61cb05d..e250c69 100644
--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -345,7 +345,7 @@ static void destroy_cache(struct zs_pool *pool)
 static unsigned long cache_alloc_handle(struct zs_pool *pool, gfp_t gfp)
 {
 	return (unsigned long)kmem_cache_alloc(pool->handle_cachep,
-			gfp & ~(__GFP_HIGHMEM|__GFP_MOVABLE));
+			GFP_NORMAL_UNMOVABLE(gfp));
 }
 
 static void cache_free_handle(struct zs_pool *pool, unsigned long handle)
@@ -356,7 +356,7 @@ static void cache_free_handle(struct zs_pool *pool, unsigned long handle)
 static struct zspage *cache_alloc_zspage(struct zs_pool *pool, gfp_t flags)
 {
 	return kmem_cache_alloc(pool->zspage_cachep,
-			flags & ~(__GFP_HIGHMEM|__GFP_MOVABLE));
+			GFP_NORMAL_UNMOVABLE(flags));
 }
 
 static void cache_free_zspage(struct zs_pool *pool, struct zspage *zspage)
-- 
1.8.3.1