diff mbox series

[049/143] mm,hugetlb: drop clearing of flag from prep_new_huge_page

Message ID 20210505013520.Fdu29YYr-%akpm@linux-foundation.org (mailing list archive)
State New
Headers show
Series [001/143] mm: introduce and use mapping_empty() | expand

Commit Message

Andrew Morton May 5, 2021, 1:35 a.m. UTC
From: Oscar Salvador <osalvador@suse.de>
Subject: mm,hugetlb: drop clearing of flag from prep_new_huge_page

Pages allocated via the page allocator or CMA get its private field
cleared by means of post_alloc_hook().

Pages allocated during boot, that is directly from the memblock allocator,
get cleared by
paging_init()->..->memmap_init_zone->..->__init_single_page() before any
memblock allocation.

Based on this ground, let us remove the clearing of the flag from
prep_new_huge_page() as it is not needed.  This was a leftover from
6c0371490140 ("hugetlb: convert PageHugeFreed to HPageFreed flag"). 
Previously the explicit clearing was necessary because compound
allocations do not get this initialization (see prep_compound_page).

Link: https://lkml.kernel.org/r/20210419075413.1064-4-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Acked-by: Michal Hocko <mhocko@suse.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

 mm/hugetlb.c |    1 -
 1 file changed, 1 deletion(-)
diff mbox series


--- a/mm/hugetlb.c~mmhugetlb-drop-clearing-of-flag-from-prep_new_huge_page
+++ a/mm/hugetlb.c
@@ -1494,7 +1494,6 @@  static void prep_new_huge_page(struct hs
-	ClearHPageFreed(page);