linux-kernel - [PATCH] mm/sparse: use __nr_to_section(section_nr) to get mem

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Message-Id: <20190809010242.29797-1-richardw.yang@linux.intel.com>
Date:   Fri,  9 Aug 2019 09:02:42 +0800
From:   Wei Yang <richardw.yang@...ux.intel.com>
To:     akpm@...ux-foundation.org, osalvador@...e.de,
        pasha.tatashin@...cle.com, mhocko@...e.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Wei Yang <richardw.yang@...ux.intel.com>
Subject: [PATCH] mm/sparse: use __nr_to_section(section_nr) to get mem_section

__pfn_to_section is defined as __nr_to_section(pfn_to_section_nr(pfn)).

Since we already get section_nr, it is not necessary to get mem_section
from start_pfn. By doing so, we reduce one redundant operation.

Signed-off-by: Wei Yang <richardw.yang@...ux.intel.com>
---
 mm/sparse.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 72f010d9bff5..95158a148cd1 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -867,7 +867,7 @@ int __meminit sparse_add_section(int nid, unsigned long start_pfn,
 	 */
 	page_init_poison(pfn_to_page(start_pfn), sizeof(struct page) * nr_pages);
 
-	ms = __pfn_to_section(start_pfn);
+	ms = __nr_to_section(section_nr);
 	set_section_nid(section_nr, nid);
 	section_mark_present(ms);
 
-- 
2.17.1