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hugetlb: add comment for subtle SetHPageVmemmapOptimized() 

JIRA: https://issues.redhat.com/browse/RHEL-1848

commit a9e1eab241bdaadd56b6cfdc481cff6a24c4799b
Author: Miaohe Lin <linmiaohe@huawei.com>
Date:   Thu Sep 1 20:00:28 2022 +0800

    hugetlb: add comment for subtle SetHPageVmemmapOptimized()

    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>

Signed-off-by: Chris von Recklinghausen <crecklin@redhat.com>
This commit is contained in:
Chris von Recklinghausen 2023-10-20 06:13:41 -04:00
parent 3f0895872f
commit b7b229594c
1 changed files with 4 additions and 0 deletions
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4
mm/hugetlb.c
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@ -1516,6 +1516,10 @@ 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);
/*