On Tue, 22 May 2018 19:21:16 +0200
Sebastian Andrzej Siewior <bige...@linutronix.de> wrote:
> On 2018-05-22 13:10:04 [-0400], Steven Rostedt wrote:
> > On Thu, 17 May 2018 14:40:06 +0200
> > Sebastian Andrzej Siewior <bige...@linutronix.de> wrote:
> >
> > > +static DEFINE_LOCAL_IRQ_LOCK(fpsimd_lock);
> > > /*
> > > * Update current's FPSIMD/SVE registers from thread_struct.
> > > *
> > > @@ -594,6 +595,7 @@ int sve_set_vector_length(struct task_struct *task,
> > > * non-SVE thread.
> > > */
> > > if (task == current) {
> > > + local_lock(fpsimd_lock);
> > > local_bh_disable();
> >
> > I'm surprised that we don't have a "local_lock_bh()"?
>
> right. Like the last time when we introduced a global lock with no
> locking context?
>
I meant, we could have local_lock_bh(fpsimd_lock); that would turn into
a local_bh_disable() when !PREEMPT_RT.
-- Steve
