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Re: [Qemu-block] [PATCH] nbd: avoid unaligned uint64_t store
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-block] [PATCH] nbd: avoid unaligned uint64_t store |
Date: |
Thu, 4 Feb 2016 16:57:24 +0100 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.0 |
On 04/02/2016 16:45, John Snow wrote:
>
>
> On 02/04/2016 05:27 AM, Paolo Bonzini wrote:
>>
>>
>> On 04/02/2016 00:48, John Snow wrote:
>>> cpu_to_be64w can't be used to make unaligned stores, but stq_be_p can.
>>> The other stores in this routine are left alone, they're aligned already.
>>>
>>> Signed-off-by: John Snow <address@hidden>
>>> ---
>>> nbd/server.c | 2 +-
>>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/nbd/server.c b/nbd/server.c
>>> index 1ec79cf..5b65059 100644
>>> --- a/nbd/server.c
>>> +++ b/nbd/server.c
>>> @@ -441,7 +441,7 @@ static coroutine_fn int nbd_negotiate(NBDClientNewData
>>> *data)
>>> }
>>>
>>> assert ((client->exp->nbdflags & ~65535) == 0);
>>> - cpu_to_be64w((uint64_t*)(buf + 18), client->exp->size);
>>> + stq_be_p((uint64_t *)(buf + 18), client->exp->size);
>>> cpu_to_be16w((uint16_t*)(buf + 26), client->exp->nbdflags |
>>> myflags);
>>> if (nbd_negotiate_write(csock, buf + 18,
>>> sizeof(buf) - 18) != sizeof(buf) - 18) {
>>>
>>
>> Let's change all of them. But no need to send another patch.
>>
>> Paolo
>>
>
> Does that mean that you're going to re-write the patch?
I will just make it bigger. :) Your one line change will still be there!
Paolo