[tglx-devel:cleanups 14/36] drivers/ptp/ptp_vmclock.c:78:18: error: '__int128' is not supported on this target

[tglx-devel:cleanups 14/36] drivers/ptp/ptp_vmclock.c:78:18: error: '__int128' is not supported on this target

[kernel test robot]

Hi Thomas,

First bad commit (maybe != root cause):

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git cleanups
head:   759e4e4e18f43902ea6f66c481a45175490cad0c
commit: de40e94c2ee6a5610211cba9e82eb50db165e6d1 [14/36] ptp: ptp_vmclock: Replace get_cycles() usage
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20260624/202606240749.dzX3DmsF-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/20260624/202606240749.dzX3DmsF-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/202606240749.dzX3DmsF-lkp@intel.com/

All errors (new ones prefixed by >>):

   drivers/ptp/ptp_vmclock.c: In function 'mul_u64_u64_shr_add_u64':
>> drivers/ptp/ptp_vmclock.c:78:18: error: '__int128' is not supported on this target
      78 |         unsigned __int128 res = (unsigned __int128)delta * period;
         |                  ^~~~~~~~
   drivers/ptp/ptp_vmclock.c:78:43: error: '__int128' is not supported on this target
      78 |         unsigned __int128 res = (unsigned __int128)delta * period;
         |                                           ^~~~~~~~
   drivers/ptp/ptp_vmclock.c:82:23: warning: right shift count >= width of type [-Wshift-count-overflow]
      82 |         *res_hi = res >> 64;
         |                       ^~


vim +/__int128 +78 drivers/ptp/ptp_vmclock.c

20503272422693d David Woodhouse 2024-10-06  62  
20503272422693d David Woodhouse 2024-10-06  63  #define VMCLOCK_FIELD_PRESENT(_c, _f)			  \
20503272422693d David Woodhouse 2024-10-06  64  	(le32_to_cpu((_c)->size) >= (offsetof(struct vmclock_abi, _f) +	\
20503272422693d David Woodhouse 2024-10-06  65  				     sizeof((_c)->_f)))
20503272422693d David Woodhouse 2024-10-06  66  
20503272422693d David Woodhouse 2024-10-06  67  /*
20503272422693d David Woodhouse 2024-10-06  68   * Multiply a 64-bit count by a 64-bit tick 'period' in units of seconds >> 64
20503272422693d David Woodhouse 2024-10-06  69   * and add the fractional second part of the reference time.
20503272422693d David Woodhouse 2024-10-06  70   *
20503272422693d David Woodhouse 2024-10-06  71   * The result is a 128-bit value, the top 64 bits of which are seconds, and
20503272422693d David Woodhouse 2024-10-06  72   * the low 64 bits are (seconds >> 64).
20503272422693d David Woodhouse 2024-10-06  73   */
20503272422693d David Woodhouse 2024-10-06  74  static uint64_t mul_u64_u64_shr_add_u64(uint64_t *res_hi, uint64_t delta,
20503272422693d David Woodhouse 2024-10-06  75  					uint64_t period, uint8_t shift,
20503272422693d David Woodhouse 2024-10-06  76  					uint64_t frac_sec)
20503272422693d David Woodhouse 2024-10-06  77  {
20503272422693d David Woodhouse 2024-10-06 @78  	unsigned __int128 res = (unsigned __int128)delta * period;
20503272422693d David Woodhouse 2024-10-06  79  
20503272422693d David Woodhouse 2024-10-06  80  	res >>= shift;
20503272422693d David Woodhouse 2024-10-06  81  	res += frac_sec;
20503272422693d David Woodhouse 2024-10-06  82  	*res_hi = res >> 64;
20503272422693d David Woodhouse 2024-10-06  83  	return (uint64_t)res;
20503272422693d David Woodhouse 2024-10-06  84  }
20503272422693d David Woodhouse 2024-10-06  85  

:::::: The code at line 78 was first introduced by commit
:::::: 20503272422693d793b84f88bf23fe4e955d3a33 ptp: Add support for the AMZNC10C 'vmclock' device

:::::: TO: David Woodhouse <dwmw@amazon.co.uk>
:::::: CC: David S. Miller <davem@davemloft.net>

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