diff options
| author | Miaohe Lin <linmiaohe@huawei.com> | 2021-02-24 23:10:11 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-02-25 00:38:35 +0300 |
| commit | 88ce3fef47f3f382985ecefe8f290b6ff05b4335 (patch) | |
| tree | 53b19c6c24ec2a9acbdc2cfe3e6a22374369eea9 /fs | |
| parent | c7e285e31f76453bc958006ebe5311a6cca909e3 (diff) | |
| download | linux-88ce3fef47f3f382985ecefe8f290b6ff05b4335.tar.xz | |
hugetlbfs: remove meaningless variable avoid_reserve
The variable avoid_reserve is meaningless because we never changed its
value and just passed it to alloc_huge_page(). So remove it to make code
more clear that in hugetlbfs_fallocate, we never avoid reserve when alloc
hugepage yet. Also add a comment offered by Mike Kravetz to explain this.
Link: https://lkml.kernel.org/r/20210120071508.9078-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/hugetlbfs/inode.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 974eee6736d2..7982adc3d98d 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -680,7 +680,6 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, */ struct page *page; unsigned long addr; - int avoid_reserve = 0; cond_resched(); @@ -716,8 +715,15 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset, continue; } - /* Allocate page and add to page cache */ - page = alloc_huge_page(&pseudo_vma, addr, avoid_reserve); + /* + * Allocate page without setting the avoid_reserve argument. + * There certainly are no reserves associated with the + * pseudo_vma. However, there could be shared mappings with + * reserves for the file at the inode level. If we fallocate + * pages in these areas, we need to consume the reserves + * to keep reservation accounting consistent. + */ + page = alloc_huge_page(&pseudo_vma, addr, 0); hugetlb_drop_vma_policy(&pseudo_vma); if (IS_ERR(page)) { mutex_unlock(&hugetlb_fault_mutex_table[hash]); |