Re: [PATCH v2] x86/hyperv: Reserve 3 interrupt vectors used exclusively by mshv

[kernel test robot <lkp@intel.com>]

Hi Mukesh,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/x86/core]
[also build test WARNING on linus/master v6.19 next-20260217]
[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/Mukesh-R/x86-hyperv-Reserve-3-interrupt-vectors-used-exclusively-by-mshv/20260218-071406
base:   tip/x86/core
patch link:    https://lore.kernel.org/r/20260217231158.1184736-1-mrathor%40linux.microsoft.com
patch subject: [PATCH v2] x86/hyperv: Reserve 3 interrupt vectors used exclusively by mshv
config: x86_64-rhel-9.4 (https://download.01.org/0day-ci/archive/20260218/202602182000.O5dSFVVd-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260218/202602182000.O5dSFVVd-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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202602182000.O5dSFVVd-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> arch/x86/kernel/cpu/mshyperv.c:485:13: warning: 'hv_reserve_irq_vectors' defined but not used [-Wunused-function]
     485 | static void hv_reserve_irq_vectors(void)
         |             ^~~~~~~~~~~~~~~~~~~~~~


vim +/hv_reserve_irq_vectors +485 arch/x86/kernel/cpu/mshyperv.c

   480	
   481	/*
   482	 * Reserve vectors hard coded in the hypervisor. If used outside, the hypervisor
   483	 * will either crash or hang or attempt to break into debugger.
   484	 */
 > 485	static void hv_reserve_irq_vectors(void)
   486	{
   487		#define HYPERV_DBG_FASTFAIL_VECTOR	0x29
   488		#define HYPERV_DBG_ASSERT_VECTOR	0x2C
   489		#define HYPERV_DBG_SERVICE_VECTOR	0x2D
   490	
   491		if (cpu_feature_enabled(X86_FEATURE_FRED))
   492			return;
   493	
   494		if (test_and_set_bit(HYPERV_DBG_ASSERT_VECTOR, system_vectors) ||
   495		    test_and_set_bit(HYPERV_DBG_SERVICE_VECTOR, system_vectors) ||
   496		    test_and_set_bit(HYPERV_DBG_FASTFAIL_VECTOR, system_vectors))
   497			BUG();
   498	
   499		pr_info("Hyper-V:reserve vectors: %d %d %d\n", HYPERV_DBG_ASSERT_VECTOR,
   500			HYPERV_DBG_SERVICE_VECTOR, HYPERV_DBG_FASTFAIL_VECTOR);
   501	}
   502	

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