Re: [PATCH v3 1/7] kernel/fork: convert vma assignment to a memcpy

[Andrew Morton]

On Wed, 25 Jan 2023 15:35:48 -0800 Suren Baghdasaryan <sur...@google.com> wrote:

> Convert vma assignment in vm_area_dup() to a memcpy() to prevent compiler
> errors when we add a const modifier to vma->vm_flags.
> 
> ...
>
> --- a/kernel/fork.c
> +++ b/kernel/fork.c
> @@ -482,7 +482,7 @@ struct vm_area_struct *vm_area_dup(struct vm_area_struct 
> *orig)
>                * orig->shared.rb may be modified concurrently, but the clone
>                * will be reinitialized.
>                */
> -             *new = data_race(*orig);
> +             memcpy(new, orig, sizeof(*new));

The data_race() removal is unchangelogged?

>               INIT_LIST_HEAD(&new->anon_vma_chain);
>               dup_anon_vma_name(orig, new);
>       }