diff options
| author | Naoya Horiguchi <naoya.horiguchi@nec.com> | 2022-04-28 23:16:02 -0700 |
|---|---|---|
| committer | akpm <akpm@linux-foundation.org> | 2022-04-28 23:16:02 -0700 |
| commit | b283d983a7a6ffe3939ff26f06d151331a7c1071 (patch) | |
| tree | 369be38981efe0927f6612c66704828fe3f95e41 /mm/hugetlb.c | |
| parent | ef526b17bc3399b8df25d574aa11fc36f89da80a (diff) | |
| download | linux-stable-b283d983a7a6ffe3939ff26f06d151331a7c1071.tar.gz linux-stable-b283d983a7a6ffe3939ff26f06d151331a7c1071.tar.bz2 linux-stable-b283d983a7a6ffe3939ff26f06d151331a7c1071.zip | |
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.c | 4 |
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; |