Re: [PATCH] mmc: block: Add new ioctl to send multi commands

[Grant Grundler]

On Thu, Sep 10, 2015 at 11:20 AM, Jon Hunter <jonathanh@xxxxxxxxxx> wrote:
>
> On 10/09/15 18:10, Grant Grundler wrote:
...
>>>>>> struct mmc_ioc_multi_cmd {
>>>>>>     __u64 num_of_cmds;
>>>>>>     struct mmc_ioc_cmd cmds[0];
>>>>>> };
>>
>> I think this would work just as well. But doesn't "pointer to an
>> array" require 32-bit ioctl compat handling?
>> We were trying to avoid a 32-bit user space compatibility handler.
>
> I think that this is fine as it is a zero length array [0] and not a
> pointer.

Doh, yes. Thanks for correcting. I knew this was a gcc special but
forgot it's not actually allocating any space.

cheers,
grant

>
> Cheers
> Jon
>
> [0] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
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