From mboxrd@z Thu Jan  1 00:00:00 1970
From: Julien Grall <julien.grall@linaro.org>
Subject: Re: [PATCH 1/2] gnttab: Introduce rwlock to protect
 updates to grant table state
Date: Tue, 02 Dec 2014 12:35:38 +0000
Message-ID: <547DB21A.3090009@linaro.org>
References: <1417514784-15749-1-git-send-email-chegger@amazon.de>
	<1417514784-15749-2-git-send-email-chegger@amazon.de>
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To: Christoph Egger <chegger@amazon.de>, xen-devel@lists.xen.org
Cc: Keir Fraser <keir@xen.org>, Matt Wilson <msw@amazon.com>, Jan Beulich <jbeulich@suse.com>
List-Id: xen-devel@lists.xenproject.org

Hi Christoph,

On 02/12/14 10:06, Christoph Egger wrote:
> diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
> index 522c43d..37c13b1 100644
> --- a/xen/arch/x86/mm.c
> +++ b/xen/arch/x86/mm.c
> @@ -4565,7 +4565,7 @@ int xenmem_add_to_physmap_one(
>                  mfn = virt_to_mfn(d->shared_info);
>              break;
>          case XENMAPSPACE_grant_table:
> -            spin_lock(&d->grant_table->lock);
> +            write_lock(&d->grant_table->lock);
>  
>              if ( d->grant_table->gt_version == 0 )
>                  d->grant_table->gt_version = 1;
> @@ -4587,7 +4587,7 @@ int xenmem_add_to_physmap_one(
>                      mfn = virt_to_mfn(d->grant_table->shared_raw[idx]);
>              }
>  
> -            spin_unlock(&d->grant_table->lock);
> +            write_unlock(&d->grant_table->lock);
>              break;
>          case XENMAPSPACE_gmfn_range:
>          case XENMAPSPACE_gmfn:

You forgot to modify the ARM bits which is using the spinlock. See
arch/arm/mm.c

Regards,

-- 
Julien Grall