linux-kernel - Re: [PATCH v9 2/6] usb:gadget Separated decoding functions from dwc3 driver.

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Date:   Wed, 07 Aug 2019 13:22:25 +0300
From:   Felipe Balbi <felipe.balbi@...ux.intel.com>
To:     Roger Quadros <rogerq@...com>, Pawel Laszczak <pawell@...ence.com>,
        "devicetree\@vger.kernel.org" <devicetree@...r.kernel.org>
Cc:     "gregkh\@linuxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-usb\@vger.kernel.org" <linux-usb@...r.kernel.org>,
        "hdegoede\@redhat.com" <hdegoede@...hat.com>,
        "heikki.krogerus\@linux.intel.com" <heikki.krogerus@...ux.intel.com>,
        "robh+dt\@kernel.org" <robh+dt@...nel.org>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        "jbergsagel\@ti.com" <jbergsagel@...com>,
        "nsekhar\@ti.com" <nsekhar@...com>, "nm\@ti.com" <nm@...com>,
        Suresh Punnoose <sureshp@...ence.com>,
        "peter.chen\@nxp.com" <peter.chen@....com>,
        Jayshri Dajiram Pawar <jpawar@...ence.com>,
        Rahul Kumar <kurahul@...ence.com>
Subject: Re: [PATCH v9 2/6] usb:gadget Separated decoding functions from dwc3 driver.


Hi,

Roger Quadros <rogerq@...com> writes:
>>>> +extern const char *usb_decode_ctrl(char *str, size_t size, __u8 bRequestType,
>>>> +				   __u8 bRequest, __u16 wValue, __u16 wIndex,
>>>> +				   __u16 wLength);
>>>> +
>>>
>>> where's the stub when !TRACING?
>> 
>> Right, I will add 
>> #ifdef	CONFIG_TRACING 
>> 	.....
>> #endif 
>
> Can usb_decode_ctrl() be used even when CONFIG_TRACING is not set?
> If yes then above #ifdefe is not sufficient.
>
> You might need to do something like
>
> #if defined(CONFIG_TRACING)
>
> extern const char *usb_decode_ctrl(..)
>
> #else
>
> static inline const char *usb_decode_ctrl(..) {
> 	return NULL;
> }
>
> #endif

This is what I mean. They shouldn't be used outside of TRACING, but it's
far safer to have the stubs.

-- 
balbi