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authorMiaohe Lin <linmiaohe@huawei.com>2021-02-24 23:10:11 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2021-02-25 00:38:35 +0300
commit88ce3fef47f3f382985ecefe8f290b6ff05b4335 (patch)
tree53b19c6c24ec2a9acbdc2cfe3e6a22374369eea9 /fs/hugetlbfs
parentc7e285e31f76453bc958006ebe5311a6cca909e3 (diff)
downloadlinux-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/hugetlbfs')
-rw-r--r--fs/hugetlbfs/inode.c12
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]);