linux-kernel - [PATCH v2 09/10] mm/migrate: replace PageHighMem() with open-code

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Date:   Wed, 29 Apr 2020 12:26:42 +0900
From:   js1304@...il.com
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Vlastimil Babka <vbabka@...e.cz>,
        Laura Abbott <labbott@...hat.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.ibm.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Roman Gushchin <guro@...com>, Minchan Kim <minchan@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Christian Koenig <christian.koenig@....com>,
        Huang Rui <ray.huang@....com>,
        Eric Biederman <ebiederm@...ssion.com>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Pavel Machek <pavel@....cz>, kernel-team@....com,
        Christoph Hellwig <hch@...radead.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: [PATCH v2 09/10] mm/migrate: replace PageHighMem() with open-code

From: Joonsoo Kim <iamjoonsoo.kim@....com>

Implementation of PageHighMem() will be changed in following patches.
Before that, use open-code to avoid the side effect of implementation
change on PageHighMem().

Acked-by: Roman Gushchin <guro@...com>
Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@....com>
---
 include/linux/migrate.h | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 3e546cb..a9cfd8e 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -37,6 +37,7 @@ static inline struct page *new_page_nodemask(struct page *page,
 	gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE | __GFP_RETRY_MAYFAIL;
 	unsigned int order = 0;
 	struct page *new_page = NULL;
+	int zidx;
 
 	if (PageHuge(page))
 		return alloc_huge_page_nodemask(page_hstate(compound_head(page)),
@@ -47,7 +48,8 @@ static inline struct page *new_page_nodemask(struct page *page,
 		order = HPAGE_PMD_ORDER;
 	}
 
-	if (PageHighMem(page) || (zone_idx(page_zone(page)) == ZONE_MOVABLE))
+	zidx = zone_idx(page_zone(page));
+	if (is_highmem_idx(zidx) || zidx == ZONE_MOVABLE)
 		gfp_mask |= __GFP_HIGHMEM;
 
 	new_page = __alloc_pages_nodemask(gfp_mask, order,
-- 
2.7.4