From: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Subject: mm/damon: remove redundant page validation
It will never get a NULL page by pte_page() as discussed in thread [1],
thus remove the redundant page validation to fix below Smatch static
checker warning.
mm/damon/vaddr.c:405 damon_hugetlb_mkold()
warn: 'page' can't be NULL.
[1] https://lore.kernel.org/linux-mm/20220106091200.GA14564@kili/
Link: https://lkml.kernel.org/r/6d32f7d201b8970d53f51b6c5717d472aed2987c.1642386715.git.baolin.wang@xxxxxxxxxxxxxxxxx
Signed-off-by: Baolin Wang <baolin.wang@xxxxxxxxxxxxxxxxx>
Reported-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Reviewed-by: SeongJae Park <sj@xxxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Acked-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
Reviewed-by: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/damon/vaddr.c | 6 ------
1 file changed, 6 deletions(-)
--- a/mm/damon/vaddr.c~mm-damon-remove-redundant-page-validation
+++ a/mm/damon/vaddr.c
@@ -402,9 +402,6 @@ static void damon_hugetlb_mkold(pte_t *p
pte_t entry = huge_ptep_get(pte);
struct page *page = pte_page(entry);
- if (!page)
- return;
-
get_page(page);
if (pte_young(entry)) {
@@ -564,9 +561,6 @@ static int damon_young_hugetlb_entry(pte
goto out;
page = pte_page(entry);
- if (!page)
- goto out;
-
get_page(page);
if (pte_young(entry) || !page_is_idle(page) ||
_
