linux-kernel - Re: [PATCH] x86/apic: Inline __x2apic_send_IPI

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Message-ID: <202512230859.jl2eLtLj-lkp@intel.com>
Date: Tue, 23 Dec 2025 09:06:05 +0800
From: kernel test robot <lkp@...el.com>
To: Eric Dumazet <edumazet@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
	"H . Peter Anvin" <hpa@...or.com>
Cc: oe-kbuild-all@...ts.linux.dev,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH] x86/apic: Inline __x2apic_send_IPI_dest()

Hi Eric,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/master]
[also build test ERROR on tip/x86/core linus/master v6.19-rc2 next-20251219]
[cannot apply to tip/auto-latest bp/for-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/Eric-Dumazet/x86-apic-Inline-__x2apic_send_IPI_dest/20251222-172515
base:   tip/master
patch link:    https://lore.kernel.org/r/20251222092208.770136-1-edumazet%40google.com
patch subject: [PATCH] x86/apic: Inline __x2apic_send_IPI_dest()
config: i386-randconfig-141-20251223 (https://download.01.org/0day-ci/archive/20251223/202512230859.jl2eLtLj-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/20251223/202512230859.jl2eLtLj-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/202512230859.jl2eLtLj-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from arch/x86/kernel/apic/apic.c:71:
>> arch/x86/kernel/apic/local.h:48:2: error: call to undeclared function 'native_x2apic_icr_write'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
      48 |         native_x2apic_icr_write(cfg, apicid);
         |         ^
   arch/x86/kernel/apic/local.h:48:2: note: did you mean 'native_apic_icr_write'?
   arch/x86/include/asm/apic.h:116:13: note: 'native_apic_icr_write' declared here
     116 | extern void native_apic_icr_write(u32 low, u32 id);
         |             ^
   1 error generated.


vim +/native_x2apic_icr_write +48 arch/x86/kernel/apic/local.h

    43	
    44	static inline void __x2apic_send_IPI_dest(unsigned int apicid, int vector,
    45						  unsigned int dest)
    46	{
    47		unsigned long cfg = __prepare_ICR(0, vector, dest);
  > 48		native_x2apic_icr_write(cfg, apicid);
    49	}
    50	

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