linux-kernel - [PATCH v2 7/7] mm/sparse.c: Use __get_free_pages() instead in populate_section

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Message-Id: <20200220043316.19668-8-bhe@redhat.com>
Date:   Thu, 20 Feb 2020 12:33:16 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        richardw.yang@...ux.intel.com, david@...hat.com, osalvador@...e.de,
        dan.j.williams@...el.com, mhocko@...e.com, bhe@...hat.com,
        rppt@...ux.ibm.com, robin.murphy@....com
Subject: [PATCH v2 7/7] mm/sparse.c: Use __get_free_pages() instead in populate_section_memmap()

This removes the unnecessary goto, and simplify codes.

Signed-off-by: Baoquan He <bhe@...hat.com>
Reviewed-by: Wei Yang <richardw.yang@...ux.intel.com>
---
 mm/sparse.c | 16 ++++++----------
 1 file changed, 6 insertions(+), 10 deletions(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 053d6c2e5c1f..572b71bd15aa 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -754,23 +754,19 @@ static void free_map_bootmem(struct page *memmap)
 struct page * __meminit populate_section_memmap(unsigned long pfn,
 		unsigned long nr_pages, int nid, struct vmem_altmap *altmap)
 {
-	struct page *page, *ret;
+	struct page *ret;
 	unsigned long memmap_size = sizeof(struct page) * PAGES_PER_SECTION;
 
-	page = alloc_pages(GFP_KERNEL|__GFP_NOWARN, get_order(memmap_size));
-	if (page)
-		goto got_map_page;
+	ret = (void *)__get_free_pages(GFP_KERNEL|__GFP_NOWARN,
+				get_order(memmap_size));
+	if (ret)
+		return ret;
 
 	ret = vmalloc(memmap_size);
 	if (ret)
-		goto got_map_ptr;
+		return ret;
 
 	return NULL;
-got_map_page:
-	ret = (struct page *)pfn_to_kaddr(page_to_pfn(page));
-got_map_ptr:
-
-	return ret;
 }
 
 static void depopulate_section_memmap(unsigned long pfn, unsigned long nr_pages,
-- 
2.17.2