Re: [PATCH V7 4/4] dmaengine: qcom_hidma: add MSI support for interrupts

[okaya@codeaurora.org]

On 2016-10-24 03:30, Andy Shevchenko wrote:
> On Mon, Oct 24, 2016 at 5:55 AM, Sinan Kaya <okaya@codeaurora.org> 
> wrote:
>> On 10/21/2016 12:11 PM, Andy Shevchenko wrote:
>>>> +static void hidma_free_msis(struct hidma_dev *dmadev)
>>>> > +{
>>>> > +#ifdef CONFIG_GENERIC_MSI_IRQ_DOMAIN
>>> Perhaps one #ifdef and two definitions of functions?
>> 
>> I don't think it will make a difference. I'll have to move
>> #ifdef around the caller of hidma_free_msis instead which
>> I think is uglier.
>> 
>> The hidma_write_msi_msg function gets called only when
>> CONFIG_GENERIC_MSI_IRQ_DOMAIN is defined. If I don't put
>> this around the function definition, I get unused function
>> warning from the compiler. This is the reason why preprocessor
>> definition is outside of the function definition.
> 
> I am talking about something like below:
> 
> #ifdef UGLY_DEFINE
> myfunc_a()
> {
> }
> 
> myfunc_b()
> {
> }
> #else
> static inline myfunc_a() {}
> static inline myfunc_b() {}
> #endif
> 
> 
> There is another way as well, namely use of IS_ENABLED(), IS_BUILTIN()
> macros (I don't remember how exactly second one is spelt).


This was my initial approach. I was asked to remove the stub functions. 
So, I did it.