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SubjectRe: [PATCH 12/41] mm: add per-VMA lock and helper functions to control it
On Mon 09-01-23 12:53:07, Suren Baghdasaryan wrote:
> diff --git a/kernel/fork.c b/kernel/fork.c
> index 5986817f393c..c026d75108b3 100644
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -474,6 +474,7 @@ struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig)
> */
> *new = data_race(*orig);
> INIT_LIST_HEAD(&new->anon_vma_chain);
> + vma_init_lock(new);
> dup_anon_vma_name(orig, new);
> }
> return new;
> @@ -1145,6 +1146,9 @@ static struct mm_struct *mm_init(struct mm_struct *mm, struct task_struct *p,
> seqcount_init(&mm->write_protect_seq);
> mmap_init_lock(mm);
> INIT_LIST_HEAD(&mm->mmlist);
> +#ifdef CONFIG_PER_VMA_LOCK
> + WRITE_ONCE(mm->mm_lock_seq, 0);
> +#endif

The mm shouldn't be visible so why WRITE_ONCE?

--
Michal Hocko
SUSE Labs

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