Re: [kbuild-all] Re: arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:633:12: error: no previous prototype for 'kvm_arch_post_init_vm'

[Rong Chen <rong.a.chen@intel.com>]

On 9/12/20 2:52 PM, Paolo Bonzini wrote:
> On 11/09/20 13:43, kernel test robot wrote:
>>>> arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:633:12: error: no previous prototype for 'kvm_arch_post_init_vm' [-Werror=missing-prototypes]
>>       633 | int __weak kvm_arch_post_init_vm(struct kvm *kvm)
>>           |            ^~~~~~~~~~~~~~~~~~~~~
>>>> arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:642:13: error: no previous prototype for 'kvm_arch_pre_destroy_vm' [-Werror=missing-prototypes]
>>       642 | void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm)
>>           |             ^~~~~~~~~~~~~~~~~~~~~~~
>>     cc1: all warnings being treated as errors
> This makes little sense, the prototypes are in include/linux/kvm_host.h
> Also this code is not architecture-dependent...
>
> kvm-ppc guys, can you reproduce it?

Hi Paolo,

The error can be reproduced with W=1:

$ make W=1 
CROSS_COMPILE=/home/nfs/0day/gcc-9.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux- 
ARCH=powerpc M=arch/powerpc/kvm | grep kvm_main
   CC [M]  arch/powerpc/kvm/../../../virt/kvm/kvm_main.o
arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:633:12: warning: no 
previous prototype for 'kvm_arch_post_init_vm' [-Wmissing-prototypes]
   633 | int __weak kvm_arch_post_init_vm(struct kvm *kvm)
       |            ^~~~~~~~~~~~~~~~~~~~~
arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:642:13: warning: no 
previous prototype for 'kvm_arch_pre_destroy_vm' [-Wmissing-prototypes]
   642 | void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm)
       |             ^~~~~~~~~~~~~~~~~~~~~~~

Best Regards,
Rong Chen

>
> Paolo
>
>>
>> Hi Junaid,
>>
>> FYI, the error/warning still remains.
>>
>> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
>> head:   e5bd0d2afe7061562c483d301e4aabb51b13fcfa
>> commit: 1aa9b9572b10529c2e64e2b8f44025d86e124308 kvm: x86: mmu: Recovery of shattered NX large pages
>> date:   10 months ago
>> config: powerpc-defconfig (attached as .config)
>> compiler: powerpc64-linux-gcc (GCC) 9.3.0
>> reproduce (this is a W=1 build):
>>          wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>>          chmod +x ~/bin/make.cross
>>          git checkout 1aa9b9572b10529c2e64e2b8f44025d86e124308
>>          # save the attached .config to linux build tree
>>          COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=powerpc
>>
>> If you fix the issue, kindly add following tag as appropriate
>> Reported-by: kernel test robot <lkp@intel.com>
>>
>> All errors (new ones prefixed by >>):
>>
>>>> arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:633:12: error: no previous prototype for 'kvm_arch_post_init_vm' [-Werror=missing-prototypes]
>>       633 | int __weak kvm_arch_post_init_vm(struct kvm *kvm)
>>           |            ^~~~~~~~~~~~~~~~~~~~~
>>>> arch/powerpc/kvm/../../../virt/kvm/kvm_main.c:642:13: error: no previous prototype for 'kvm_arch_pre_destroy_vm' [-Werror=missing-prototypes]
>>       642 | void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm)
>>           |             ^~~~~~~~~~~~~~~~~~~~~~~
>>     cc1: all warnings being treated as errors
>>
>> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1aa9b9572b10529c2e64e2b8f44025d86e124308
>> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>> git fetch --no-tags linus xlnx/master
>> git checkout 1aa9b9572b10529c2e64e2b8f44025d86e124308
>> vim +/kvm_arch_post_init_vm +633 arch/powerpc/kvm/../../../virt/kvm/kvm_main.c
>>
>>     628	
>>     629	/*
>>     630	 * Called after the VM is otherwise initialized, but just before adding it to
>>     631	 * the vm_list.
>>     632	 */
>>   > 633	int __weak kvm_arch_post_init_vm(struct kvm *kvm)
>>     634	{
>>     635		return 0;
>>     636	}
>>     637	
>>     638	/*
>>     639	 * Called just after removing the VM from the vm_list, but before doing any
>>     640	 * other destruction.
>>     641	 */
>>   > 642	void __weak kvm_arch_pre_destroy_vm(struct kvm *kvm)
>>     643	{
>>     644	}
>>     645	
>>
>> ---
>> 0-DAY CI Kernel Test Service, Intel Corporation
>> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>>
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