Commit 88ce3fef authored by Miaohe Lin's avatar Miaohe Lin Committed by Linus Torvalds

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.comSigned-off-by: default avatarMiaohe Lin <linmiaohe@huawei.com>
Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
Reviewed-by: default avatarMike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c7e285e3
......@@ -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]);
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment