linux-kernel - Re: [PATCH] tee: add forward declaration for struct device

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Date:   Wed, 14 Jun 2017 13:01:55 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Jens Wiklander <jens.wiklander@...aro.org>
Cc:     Jerome Forissier <jerome.forissier@...aro.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        tee-dev@...ts.linaro.org
Subject: Re: [PATCH] tee: add forward declaration for struct device

On Wed, Jun 14, 2017 at 11:46 AM, Jens Wiklander
<jens.wiklander@...aro.org> wrote:
> On Wed, Jun 14, 2017 at 11:39:50AM +0200, Jerome Forissier wrote:
>> [+Arnd]
>>
>> Ping?
>>
>> Thanks,
>> --
>> Jerome
>>
>> On 05/31/2017 01:21 PM, Jerome Forissier wrote:
>> > tee_drv.h references struct device, but does not include device.h nor
>> > platform_device.h. Therefore, if tee_drv.h is included by some file
>> > that does not pull device.h nor platform_device.h beforehand, we have a
>> > compile warning. Fix this by adding a forward declaration.
>> >
>> > Signed-off-by: Jerome Forissier <jerome.forissier@...aro.org>

Acked-by: Arnd Bergmann <arnd@...db.de>

Do we need this to fix a warning in mainline, in linux-next, or only
in combination with some other patches?

I have not run into this warning in my build testing.

>> >  include/linux/tee_drv.h | 1 +
>> >  1 file changed, 1 insertion(+)
>> >
>> > diff --git a/include/linux/tee_drv.h b/include/linux/tee_drv.h
>> > index 8614713..07bd226 100644
>> > --- a/include/linux/tee_drv.h
>> > +++ b/include/linux/tee_drv.h
>> > @@ -29,6 +29,7 @@
>> >  #define TEE_SHM_DMA_BUF            BIT(1)  /* Memory with dma-buf handle */
>> >  #define TEE_SHM_EXT_DMA_BUF        BIT(2)  /* Memory with dma-buf handle */
>> >
>> > +struct device;
>> >  struct tee_device;
>> >  struct tee_shm;
>> >  struct tee_shm_pool;
>> >
>
> Looks good to me.
>
> Reviewed-by: Jens Wiklander <jens.wiklander@...aro.org>

Can you pick up the patch in your git tree and send a pull request for
the appropriate release (4.12-fixes or 4.13)?

If you don't expect to send anything else for tee in that release,
you can also forward the patch to arm@...nel.org and ask for
inclusion. If you just reply with the 'Reviewed-by', I would not
expect to have to do anything in the arm-soc tree.

     Arnd