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authorNaoya Horiguchi <naoya.horiguchi@nec.com>2022-04-28 23:16:02 -0700
committerakpm <akpm@linux-foundation.org>2022-04-28 23:16:02 -0700
commitb283d983a7a6ffe3939ff26f06d151331a7c1071 (patch)
tree369be38981efe0927f6612c66704828fe3f95e41 /mm/hugetlb.c
parentef526b17bc3399b8df25d574aa11fc36f89da80a (diff)
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mm, hugetlb, hwpoison: separate branch for free and in-use hugepage
We know that HPageFreed pages should have page refcount 0, so get_page_unless_zero() always fails and returns 0. So explicitly separate the branch based on page state for minor optimization and better readability. Link: https://lkml.kernel.org/r/20220415041848.GA3034499@ik1-406-35019.vs.sakura.ne.jp Signed-off-by: Naoya Horiguchi <naoya.horiguchi@nec.com> Suggested-by: Mike Kravetz <mike.kravetz@oracle.com> Suggested-by: Miaohe Lin <linmiaohe@huawei.com> Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com> Reviewed-by: Miaohe Lin <linmiaohe@huawei.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb.c')
-rw-r--r--mm/hugetlb.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 3fc721789743..f8e048b939c7 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6776,7 +6776,9 @@ int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
spin_lock_irq(&hugetlb_lock);
if (PageHeadHuge(page)) {
*hugetlb = true;
- if (HPageFreed(page) || HPageMigratable(page))
+ if (HPageFreed(page))
+ ret = 0;
+ else if (HPageMigratable(page))
ret = get_page_unless_zero(page);
else
ret = -EBUSY;