Re: [RFC PATCH 10/10] x86: snapshot thread flags

[Thomas Gleixner]

On Wed, Jun 09 2021 at 13:20, Mark Rutland wrote:
> Some thread flags can be set remotely, and so even when IRQs are
> disabled, the flags can change under our feet. Generally this is
> unlikely to cause a problem in practice, but it is somewhat unsound, and
> KCSAN will legitimately warn that there is a data race.
>
> To avoid such issues, we should snapshot the flags prior to using them.
> Let's use the new helpers to do so on x86.

 To avoid such issues, a snapshot of the flags has to be taken prior to
 using them. Some places already use READ_ONCE() for that, others do
 not.

 Convert them all to the new flag accessor helpers.

Other than that.

 Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>