Re: [PATCH net-next v12 15/15] net: homa: create Makefile and Kconfig

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

Hi John,

kernel test robot noticed the following build errors:

[auto build test ERROR on net/main]
[also build test ERROR on linus/master v6.16-rc7 next-20250725]
[cannot apply to net-next/main horms-ipvs/master]
[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/John-Ousterhout/net-homa-define-user-visible-API-for-Homa/20250725-024511
base:   net/main
patch link:    https://lore.kernel.org/r/20250724184050.3130-16-ouster%40cs.stanford.edu
patch subject: [PATCH net-next v12 15/15] net: homa: create Makefile and Kconfig
config: um-allmodconfig (https://download.01.org/0day-ci/archive/20250727/202507270639.OBQsePz1-lkp@intel.com/config)
compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250727/202507270639.OBQsePz1-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/202507270639.OBQsePz1-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from net/homa/homa_incoming.c:5:
   In file included from net/homa/homa_impl.h:13:
   In file included from include/linux/icmp.h:16:
   In file included from include/linux/skbuff.h:17:
   In file included from include/linux/bvec.h:10:
   In file included from include/linux/highmem.h:12:
   In file included from include/linux/hardirq.h:11:
   In file included from arch/um/include/asm/hardirq.h:5:
   In file included from include/asm-generic/hardirq.h:17:
   In file included from include/linux/irq.h:20:
   In file included from include/linux/io.h:12:
   In file included from arch/um/include/asm/io.h:24:
   include/asm-generic/io.h:1175:55: warning: performing pointer arithmetic on a null pointer has undefined behavior [-Wnull-pointer-arithmetic]
    1175 |         return (port > MMIO_UPPER_LIMIT) ? NULL : PCI_IOBASE + port;
         |                                                   ~~~~~~~~~~ ^
   In file included from net/homa/homa_incoming.c:5:
>> net/homa/homa_impl.h:557:9: error: use of undeclared identifier 'tsc_khz'
     557 |         return tsc_khz;
         |                ^
   1 warning and 1 error generated.


vim +/tsc_khz +557 net/homa/homa_impl.h

4d2ad8007f1c33 John Ousterhout 2025-07-24  548  
4d2ad8007f1c33 John Ousterhout 2025-07-24  549  /**
4d2ad8007f1c33 John Ousterhout 2025-07-24  550   * homa_clock_khz() - Return the frequency of the values returned by
4d2ad8007f1c33 John Ousterhout 2025-07-24  551   * homa_clock, in units of KHz.
4d2ad8007f1c33 John Ousterhout 2025-07-24  552   * Return: see above.
4d2ad8007f1c33 John Ousterhout 2025-07-24  553   */
4d2ad8007f1c33 John Ousterhout 2025-07-24  554  static inline u64 homa_clock_khz(void)
4d2ad8007f1c33 John Ousterhout 2025-07-24  555  {
4d2ad8007f1c33 John Ousterhout 2025-07-24  556  #ifdef CONFIG_X86_TSC
4d2ad8007f1c33 John Ousterhout 2025-07-24 @557  	return tsc_khz;
4d2ad8007f1c33 John Ousterhout 2025-07-24  558  #else
4d2ad8007f1c33 John Ousterhout 2025-07-24  559  	return 1000000;
4d2ad8007f1c33 John Ousterhout 2025-07-24  560  #endif /* CONFIG_X86_TSC */
4d2ad8007f1c33 John Ousterhout 2025-07-24  561  }
4d2ad8007f1c33 John Ousterhout 2025-07-24  562  

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