linux-kernel - [PATCH] mm/page_alloc: use nth

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Message-Id: <b75be84c34466eb063bd44ee1ff7f2bf085002b2.1490323567.git.geliangtang@gmail.com>
Date:   Fri, 24 Mar 2017 22:10:50 +0800
From:   Geliang Tang <geliangtang@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>
Cc:     Geliang Tang <geliangtang@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] mm/page_alloc: use nth_page helper

Use nth_page() helper instead of page_to_pfn() and pfn_to_page() to
simplify the code.

Signed-off-by: Geliang Tang <geliangtang@...il.com>
---
 mm/page_alloc.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index f749b7f..3354f56 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -2511,9 +2511,8 @@ void mark_free_pages(struct zone *zone)
 				&zone->free_area[order].free_list[t], lru) {
 			unsigned long i;
 
-			pfn = page_to_pfn(page);
 			for (i = 0; i < (1UL << order); i++)
-				swsusp_set_page_free(pfn_to_page(pfn + i));
+				swsusp_set_page_free(nth_page(page, i));
 		}
 	}
 	spin_unlock_irqrestore(&zone->lock, flags);
-- 
2.9.3