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SubjectRe: [patch 1/2] mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks
On Tue, 12 Dec 2017, Dimitri Sivanich wrote:

> > --- a/drivers/misc/sgi-gru/grutlbpurge.c
> > +++ b/drivers/misc/sgi-gru/grutlbpurge.c
> > @@ -298,6 +298,7 @@ struct gru_mm_struct *gru_register_mmu_notifier(void)
> > return ERR_PTR(-ENOMEM);
> > STAT(gms_alloc);
> > spin_lock_init(&gms->ms_asid_lock);
> > + gms->ms_notifier.flags = 0;
> > gms->ms_notifier.ops = &gru_mmuops;
> > atomic_set(&gms->ms_refcnt, 1);
> > init_waitqueue_head(&gms->ms_wait_queue);
> > diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
>
> There is a kzalloc() just above this:
> gms = kzalloc(sizeof(*gms), GFP_KERNEL);
>
> Is that not sufficient to clear the 'flags' field?
>

Absolutely, but whether it is better to explicitly document that the mmu
notifier has cleared flags, i.e. there are no blockable callbacks, is
another story. I can change it if preferred.

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