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hugetlb: add comment for subtle SetHPageVmemmapOptimized()

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The SetHPageVmemmapOptimized() called here seems unnecessary as it's
assumed to be set when calling this function. But it's indeed cleared
by above set_page_private(page, 0). Add a comment to avoid possible
future confusion.

Link: https://lkml.kernel.org/r/20220901120030.63318-9-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Miaohe Lin 2022-09-01 20:00:28 +08:00 committed by Andrew Morton
parent 29be84265f
commit a9e1eab241
1 changed files with 4 additions and 0 deletions
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4
mm/hugetlb.c
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@ -1504,6 +1504,10 @@ static void add_hugetlb_page(struct hstate *h, struct page *page,
set_compound_page_dtor(page, HUGETLB_PAGE_DTOR);
set_page_private(page, 0);
/*
* We have to set HPageVmemmapOptimized again as above
* set_page_private(page, 0) cleared it.
*/
SetHPageVmemmapOptimized(page);
/*