linux-kernel - Re: [RFC PATCH] mmc: block: Add new ioctl to send combo commands

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Date:	Wed, 2 Sep 2015 15:08:49 -0700
From:	Grant Grundler <grundler@...gle.com>
To:	Olof Johansson <olof@...om.net>
Cc:	Jon Hunter <jonathanh@...dia.com>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Olof Johansson <olofj@...omium.org>,
	Seshagiri Holi <sholi@...dia.com>
Subject: Re: [RFC PATCH] mmc: block: Add new ioctl to send combo commands

[resending text-only]

On Wed, Sep 2, 2015 at 3:07 PM, Grant Grundler <grundler@...gle.com> wrote:
>
>
> On Wed, Sep 2, 2015 at 11:28 AM, Olof Johansson <olof@...om.net> wrote:
> ...
>> > +/**
>> > + * struct mmc_ioc_combo_cmd - combo command information
>> > + * @num_of_cmds: number of commands to send
>> > + * @mmc_ioc_cmd_list: pointer to list of commands
>> > + */
>> > +struct mmc_ioc_combo_cmd {
>> > +       uint8_t num_of_cmds;
>> > +       struct mmc_ioc_cmd *mmc_ioc_cmd_list;
>> > +};
>>
>> The size of this struct will depend on the pointer size of userspace.
>>
>> It might be better to use a u64 for the pointer instead. Otherwise
>> you'd need a compat ioctl wrapper to copy a 32-bit pointer over on a
>> 64-bit kernel.
>
> If alignment matters, then maybe swap the fields?
> Or declare num_of_cmds as u64 as well?
>
> grant
>
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