linux-kernel - Re: [tip:x86/entry 4/80] drivers/xen/events/events_base.c:1664:6: warning: no previous prototype for 'xen_setup_callback

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Date:   Wed, 20 May 2020 12:50:40 +0200
From:   Vitaly Kuznetsov <vkuznets@...hat.com>
To:     x86@...nel.org
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        kbuild test robot <lkp@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [tip:x86/entry 4/80] drivers/xen/events/events_base.c:1664:6: warning: no previous prototype for 'xen_setup_callback_vector'

kbuild test robot <lkp@...el.com> writes:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/entry
> head:   095b7a3e7745e6fb7cf0a1c09967c4f43e76f8f4
> commit: fad1940a6a856f59b073e8650e02052ce531154c [4/80] x86/xen: Split HVM vector callback setup and interrupt gate allocation
> config: arm-randconfig-r013-20200519 (attached as .config)
> compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout fad1940a6a856f59b073e8650e02052ce531154c
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm 
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kbuild test robot <lkp@...el.com>
>
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
>
>>> drivers/xen/events/events_base.c:1664:6: warning: no previous prototype for 'xen_setup_callback_vector' [-Wmissing-prototypes]
> 1664 | void xen_setup_callback_vector(void) {}
> |      ^~~~~~~~~~~~~~~~~~~~~~~~~
>
> vim +/xen_setup_callback_vector +1664 drivers/xen/events/events_base.c
>
>   1654	
>   1655	static __init void xen_alloc_callback_vector(void)
>   1656	{
>   1657		if (!xen_have_vector_callback)
>   1658			return;
>   1659	
>   1660		pr_info("Xen HVM callback vector for event delivery is enabled\n");
>   1661		alloc_intr_gate(HYPERVISOR_CALLBACK_VECTOR, xen_hvm_callback_vector);
>   1662	}
>   1663	#else
>> 1664	void xen_setup_callback_vector(void) {}

This isn't new in the patch as it just renames 'xen_callback_vector()'
to 'xen_setup_callback_vector()' but we likely need to add 'static'
here. I'll send a patch.


>   1665	static inline void xen_alloc_callback_vector(void) {}
>   1666	#endif
>   1667	
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

-- 
Vitaly