Re: [Xen-devel] [PATCH 6/7] mini-os: Added rmb to xenbus code

[Thomas Leonard <talex5@xxxxxxxxx>]

Hi Karim,

Do you remember what this rmb call is for? It's from your commit here:

https://github.com/KarimAllah/xen/commit/61e8edeb9eabdf575f6f8e7720d977f07d907579#diff-dd67cee31c935093d2c65298a1d5b267R455

https://github.com/KarimAllah/xen/blob/61e8edeb9eabdf575f6f8e7720d977f07d907579/extras/mini-os/xenbus/xenbus.c#L455

Also, if you have any information to add to the other commits, that
would be very useful:

https://github.com/talex5/xen/commits/sent-Jun-04



On 5 June 2014 14:55, Julien Grall <julien.grall@xxxxxxxxxx> wrote:
> Hi Thomas,
>
> Thank you for the patch.
>
> On 06/04/2014 05:06 PM, Thomas Leonard wrote:
>> From: Karim Raslan <karim.allah.ahmed@xxxxxxxxx>
>>
>> Signed-off-by: Karim Allah Ahmed <karim.allah.ahmed@xxxxxxxxx>
>> [talex5@xxxxxxxxx: separated from big ARM commit]
>> Signed-off-by: Thomas Leonard <talex5@xxxxxxxxx>
>> ---
>>  extras/mini-os/xenbus/xenbus.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/extras/mini-os/xenbus/xenbus.c b/extras/mini-os/xenbus/xenbus.c
>> index d995020..8a99ee2 100644
>> --- a/extras/mini-os/xenbus/xenbus.c
>> +++ b/extras/mini-os/xenbus/xenbus.c
>> @@ -450,6 +450,7 @@ xenbus_msg_reply(int type,
>>      remove_waiter(w, req_info[id].waitq);
>>      wake(current);
>>
>> +    rmb();
>
> Could you explain in the commit message why this rmb is necessary?
>
> Regards,
>
> --
> Julien Grall



-- 
Dr Thomas Leonard        http://0install.net/
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