Re: [PATCH v2] mm/hugetlb: remove redundant check in preparing and destroying gigantic page

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I'm sorry for forgetting to add David.
Now add David :)

Thanks,
Yanfei

On 2/2/21 7:20 PM, yanfei.xu@xxxxxxxxxxxxx wrote:
From: Yanfei Xu <yanfei.xu@xxxxxxxxxxxxx>

Gigantic page is a compound page and its order is more than 1.
Thus it must be available for hpage_pincount. Let's remove the
redundant check for gigantic page.

Signed-off-by: Yanfei Xu <yanfei.xu@xxxxxxxxxxxxx>
---
  mm/hugetlb.c | 7 ++-----
  1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index a3e4fa2c5e94..dac5db569ccb 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -1219,8 +1219,7 @@ static void destroy_compound_gigantic_page(struct page *page,
  	struct page *p = page + 1;
atomic_set(compound_mapcount_ptr(page), 0);
-	if (hpage_pincount_available(page))
-		atomic_set(compound_pincount_ptr(page), 0);
+	atomic_set(compound_pincount_ptr(page), 0);
for (i = 1; i < nr_pages; i++, p = mem_map_next(p, page, i)) {
  		clear_compound_head(p);
@@ -1501,9 +1500,7 @@ static void prep_compound_gigantic_page(struct page *page, unsigned int order)
  		set_compound_head(p, page);
  	}
  	atomic_set(compound_mapcount_ptr(page), -1);
-
-	if (hpage_pincount_available(page))
-		atomic_set(compound_pincount_ptr(page), 0);
+	atomic_set(compound_pincount_ptr(page), 0);
  }
/*






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