Re: [Xen-devel] [PATCH v2 1/4] xen/arm: Add macro MB

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 09/26/2013 04:30 PM, Ian Campbell wrote:
> On Thu, 2013-09-26 at 16:26 +0100, Julien Grall wrote:
>> On 09/26/2013 03:32 PM, Ian Campbell wrote:
>>> On Thu, 2013-09-26 at 13:56 +0100, Julien Grall wrote:
>>>> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
>>>> ---
>>>>  xen/include/asm-arm/config.h |    1 +
>>>>  1 file changed, 1 insertion(+)
>>>>
>>>> diff --git a/xen/include/asm-arm/config.h b/xen/include/asm-arm/config.h
>>>> index 604088e..2cea1ba 100644
>>>> --- a/xen/include/asm-arm/config.h
>>>> +++ b/xen/include/asm-arm/config.h
>>>> @@ -119,6 +119,7 @@
>>>>  #define BOOT_MISC_VIRT_START   _AT(vaddr_t,0x00600000)
>>>>  
>>>>  #define HYPERVISOR_VIRT_START  XEN_VIRT_START
>>>> +#define MB(_mb)     (_AC(_mb, UL) << 20)
>>>
>>> Can you move the GB here too for consistency.
>>>
>>> In fact it would be worth considering moving this to
>>> xen/include/xen/config.h and consolidating the x86 version too.
>>
>> I will do.
> 
> Thanks.
> 
>> I'm wondering, do we need to use ULL instead of UL in GB and MB?
> 
> Is it used with a paddr_t anywhere? If it's just vaddr then UL is fine.

MB will be used with paddr_t. GB not yet, but it could be used to
replace 0x1...ULL in a such patch:
http://permalink.gmane.org/gmane.comp.emulators.xen.devel/172128

-- 
Julien Grall

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