Re: [Xen-devel] [PATCH v4 5/6] xen: arm: relax barriers in tlb flushes

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 04/03/2014 09:59 AM, Ian Campbell wrote:
> @@ -333,12 +333,12 @@ static inline void flush_xen_data_tlb_range_va(unsigned 
> long va,
>                                                 unsigned long size)
>  {
>      unsigned long end = va + size;
> -    dsb(sy); /* Ensure preceding are visible */
> +    dsb(ish); /* Ensure preceding are visible */

I'm a bit lost with ish/nsh/sy/... shall we keep sy here?
flush_xen_data_tlb is used in iounmap and we want to make sure that
every write as been done just before.

Regards,

-- 
Julien Grall

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