From: Miaohe Lin <linmiaohe@huawei.com>
To: <akpm@linux-foundation.org>, <mike.kravetz@oracle.com>
Cc: <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
<linmiaohe@huawei.com>
Subject: [PATCH v2] mm/hugetlb: remove redundant reservation check condition in alloc_huge_page()
Date: Mon, 1 Mar 2021 05:47:26 -0500 [thread overview]
Message-ID: <20210301104726.45159-1-linmiaohe@huawei.com> (raw)
vma_resv_map(vma) checks if a reserve map is associated with the vma. The
routine vma_needs_reservation() will check vma_resv_map(vma) and return 1
if no reserv map is present. map_chg is set to the return value of
vma_needs_reservation(). Therefore, !vma_resv_map(vma) is redundant in the
expression:
map_chg || avoid_reserve || !vma_resv_map(vma);
Remove the redundant check.
[Thanks Mike Kravetz for reshaping this commit message!]
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
mm/hugetlb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 60c67eb016f7..060005b868cf 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -2314,7 +2314,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
/* If this allocation is not consuming a reservation, charge it now.
*/
- deferred_reserve = map_chg || avoid_reserve || !vma_resv_map(vma);
+ deferred_reserve = map_chg || avoid_reserve;
if (deferred_reserve) {
ret = hugetlb_cgroup_charge_cgroup_rsvd(
idx, pages_per_huge_page(h), &h_cg);
--
2.19.1
next reply other threads:[~2021-03-01 10:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-01 10:47 Miaohe Lin [this message]
2021-03-02 21:54 ` [PATCH v2] mm/hugetlb: remove redundant reservation check condition in alloc_huge_page() Mike Kravetz
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