linux-kernel - Re: linux-next: Tree for Nov 2 (compiler-gcc.h)

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Date:   Sat, 3 Nov 2018 16:00:51 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Wolfgang Rohdewald <wolfgang@...dewald.de>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux-Next Mailing List <linux-next@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>
Subject: Re: linux-next: Tree for Nov 2 (compiler-gcc.h)

On 11/3/18 3:58 PM, Miguel Ojeda wrote:
> On Sat, Nov 3, 2018 at 5:10 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>>
>> No plugins are enabled.
>> The failing randconfig file (for x86_64) is attached.
> 
> Confirmed with a built-from-sources 4.8.5 on current master
> (d2ff0ff2c23f). The ICE also happens with 4.6.4. With 8.1.0, however,
> we get an error instead:
> 
> In file included from drivers/media/usb/dvb-usb/pctv452e.c:20:
> drivers/media/usb/dvb-usb/pctv452e.c: In function 'pctv452e_frontend_attach':
> ./drivers/media/dvb-frontends/stb0899_drv.h:151:36: error: weak
> declaration of 'stb0899_attach' being applied to a already existing,
> static definition
>  static inline struct dvb_frontend *stb0899_attach(struct
> stb0899_config *config,
>                                     ^~~~~~~~~~~~~~
> 
> Which seems to have been spotted by kbuild months ago:
> 
>   https://lkml.org/lkml/2018/3/10/358
> 
> The problem is in pctv452e_frontend_attach():
> 
> /*
> * dvb_frontend will call dvb_detach for both stb0899_detach
> * and stb0899_release but we only do dvb_attach(stb0899_attach).
> * Increment the module refcount instead.
> */
> symbol_get(stb0899_attach);
> 
> Here symbol_get() is declaring a weak function (due to
> !CONFIG_MODULES) while this definition in stb0899_drv.h occurs (due to
> !CONFIG_DVB_STB0899):
> 
> static inline struct dvb_frontend *stb0899_attach(struct stb0899_config *config,
>   struct i2c_adapter *i2c)
> {
> printk(KERN_WARNING "%s: Driver disabled by Kconfig\n", __func__);
> return NULL;
> }
> 
> I guess pctv452e should require CONFIG_DVB_STB0899, or similar. CC'ing
> Mauro, Wolfgang, linux-media.
> 
> Hope that helps!

Thanks for digging into this.  :)

cheers.
-- 
~Randy