linux-kernel - Re: [patch 1/2] mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks

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Date:   Tue, 12 Dec 2017 14:05:42 -0600
From:   Dimitri Sivanich <sivanich@....com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Oded Gabbay <oded.gabbay@...il.com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Airlie <airlied@...ux.ie>,
        Joerg Roedel <joro@...tes.org>,
        Doug Ledford <dledford@...hat.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Sean Hefty <sean.hefty@...el.com>,
        Dimitri Sivanich <sivanich@....com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [patch 1/2] mm, mmu_notifier: annotate mmu notifiers with
 blockable invalidate callbacks

On Mon, Dec 11, 2017 at 02:11:55PM -0800, David Rientjes 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?