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

Commit Message

Andrew Morton May 5, 2021, 1:35 a.m. UTC

From: Oscar Salvador <[e-mail]>
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/[e-mail]
Signed-off-by: Oscar Salvador <[e-mail]>
Acked-by: Michal Hocko <[e-mail]>
Reviewed-by: David Hildenbrand <[e-mail]>
Reviewed-by: Mike Kravetz <[e-mail]>
Cc: Muchun Song <[e-mail]>
Cc: Vlastimil Babka <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

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

Patch

--- 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
 	spin_lock_irq(&hugetlb_lock);
 	h->nr_huge_pages++;
 	h->nr_huge_pages_node[nid]++;
-	ClearHPageFreed(page);
 	spin_unlock_irq(&hugetlb_lock);
 }