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

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Date:   Sun, 23 Oct 2016 19:55:29 -0700
From:   Sinan Kaya <okaya@...eaurora.org>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     dmaengine <dmaengine@...r.kernel.org>,
        Timur Tabi <timur@...eaurora.org>,
        devicetree <devicetree@...r.kernel.org>,
        Christopher Covington <cov@...eaurora.org>,
        Vinod Koul <vinod.koul@...el.com>,
        Jon Masters <jcm@...hat.com>,
        Andy Gross <agross@...eaurora.org>,
        Arnd Bergmann <arnd@...db.de>, linux-arm-msm@...r.kernel.org,
        linux-arm Mailing List <linux-arm-kernel@...ts.infradead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Lars-Peter Clausen <lars@...afoo.de>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V7 4/4] dmaengine: qcom_hidma: add MSI support for
 interrupts

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.


-- 
Sinan Kaya
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.