Re: [PATCHv15 02/17] x86: Allow atomic MM_CONTEXT flags setting

[Alexander Potapenko]

On Mon, Jan 23, 2023 at 11:05 PM Kirill A. Shutemov
<kirill.shutemov@xxxxxxxxxxxxxxx> wrote:
>
> So far there's no need in atomic setting of MM context flags in
> mm_context_t::flags. The flags set early in exec and never change
> after that.
>
> LAM enabling requires atomic flag setting. The upcoming flag
> MM_CONTEXT_FORCE_TAGGED_SVA can be set much later in the process
> lifetime where multiple threads exist.
>
> Convert the field to unsigned long and do MM_CONTEXT_* accesses with
> __set_bit() and test_bit().
>
> No functional changes.
>
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: Alexander Potapenko <glider@xxxxxxxxxx>