Commit a43a83c7 authored by Miaohe Lin's avatar Miaohe Lin Committed by Andrew Morton
Browse files

mm/hugetlb: fix incorrect update of max_huge_pages 

Patch series "A few fixup patches for hugetlb".

This series contains a few fixup patches to fix incorrect update of
max_huge_pages, fix WARN_ON(!kobj) in sysfs_create_group() and so on.
More details can be found in the respective changelogs.


This patch (of 6):

There should be pages_per_huge_page(h) /
pages_per_huge_page(target_hstate) pages incremented for
target_hstate->max_huge_pages when page is demoted.  Update max_huge_pages
accordingly for consistency.

Link: https://lkml.kernel.org/r/20220816130553.31406-1-linmiaohe@huawei.com
Link: https://lkml.kernel.org/r/20220816130553.31406-2-linmiaohe@huawei.com


Signed-off-by: default avatarMiaohe Lin <linmiaohe@huawei.com>
Reviewed-by: default avatarMuchun Song <songmuchun@bytedance.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent c959924b

mm/hugetlb.c

+2 −1
Original line number Diff line number Diff line
@@ -3472,7 +3472,8 @@ static int demote_free_huge_page(struct hstate *h, struct page *page) 
	 * based on pool changes for the demoted page.

	 */

	h->max_huge_pages--;

	target_hstate->max_huge_pages += pages_per_huge_page(h);

	target_hstate->max_huge_pages +=

		pages_per_huge_page(h) / pages_per_huge_page(target_hstate);



	return rc;

}