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SubjectRe: [PATCH] fork: Use helper function mapping_allow_writable() in dup_mmap()
Miaohe Lin <linmiaohe@huawei.com> writes:

> Use helper function mapping_allow_writable() to atomic_inc
> i_mmap_writable.

Why?


> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
> ---
> kernel/fork.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/fork.c b/kernel/fork.c
> index 4b328aecabb2..a0586716e327 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -558,7 +558,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm,
> atomic_dec(&inode->i_writecount);
> i_mmap_lock_write(mapping);
> if (tmp->vm_flags & VM_SHARED)
> - atomic_inc(&mapping->i_mmap_writable);
> + mapping_allow_writable(mapping);
> flush_dcache_mmap_lock(mapping);
> /* insert tmp into the share list, just after mpnt */
> vma_interval_tree_insert_after(tmp, mpnt,

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