linux-kernel - Re: [PATCH 4/7] mm/sparse.c: Use __get_free_pages() instead in populate_section

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Date:   Mon, 10 Feb 2020 07:39:35 +0800
From:   Wei Yang <richardw.yang@...ux.intel.com>
To:     Baoquan He <bhe@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org, dan.j.williams@...el.com,
        richardw.yang@...ux.intel.com, david@...hat.com
Subject: Re: [PATCH 4/7] mm/sparse.c: Use __get_free_pages() instead in
 populate_section_memmap()

On Sun, Feb 09, 2020 at 06:48:23PM +0800, Baoquan He wrote:
>This removes the unnecessary goto, and simplify codes.
>
>Signed-off-by: Baoquan He <bhe@...hat.com>

Reasonable.

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 cf55d272d0a9..36e6565ec67e 100644
>--- a/mm/sparse.c
>+++ b/mm/sparse.c
>@@ -751,23 +751,19 @@ 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

-- 
Wei Yang
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