linux-kernel - Re: [PATCH v2 21/21] x86/pvlocks: Move paravirt spinlock functions into own header

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Message-ID: <202509181008.MoLd2u4e-lkp@intel.com>
Date: Thu, 18 Sep 2025 10:45:17 +0800
From: kernel test robot <lkp@...el.com>
To: Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, linux-hyperv@...r.kernel.org,
	virtualization@...ts.linux.dev, kvm@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Juergen Gross <jgross@...e.com>,
	"K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ajay Kaher <ajay.kaher@...adcom.com>,
	Alexey Makhalov <alexey.makhalov@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v2 21/21] x86/pvlocks: Move paravirt spinlock functions
 into own header

Hi Juergen,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/sched/core]
[also build test WARNING on kvm/queue kvm/next linus/master v6.17-rc6 next-20250917]
[cannot apply to tip/x86/core kvm/linux-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Juergen-Gross/x86-paravirt-Remove-not-needed-includes-of-paravirt-h/20250917-230321
base:   tip/sched/core
patch link:    https://lore.kernel.org/r/20250917145220.31064-22-jgross%40suse.com
patch subject: [PATCH v2 21/21] x86/pvlocks: Move paravirt spinlock functions into own header
config: x86_64-randconfig-003-20250918 (https://download.01.org/0day-ci/archive/20250918/202509181008.MoLd2u4e-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250918/202509181008.MoLd2u4e-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202509181008.MoLd2u4e-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/paravirt-spinlocks.c:13:13: warning: no previous prototype for function 'native_pv_lock_init' [-Wmissing-prototypes]
      13 | void __init native_pv_lock_init(void)
         |             ^
   arch/x86/kernel/paravirt-spinlocks.c:13:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
      13 | void __init native_pv_lock_init(void)
         | ^
         | static 
   1 warning generated.


vim +/native_pv_lock_init +13 arch/x86/kernel/paravirt-spinlocks.c

    12	
  > 13	void __init native_pv_lock_init(void)
    14	{
    15		if (boot_cpu_has(X86_FEATURE_HYPERVISOR))
    16			static_branch_enable(&virt_spin_lock_key);
    17	}
    18	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki