[dwmw2:vmtk 36/37] kernel/time/timekeeping.c:2351:2: error: use of undeclared identifier '__uint128_t'

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

tree:   git://git.infradead.org/users/dwmw2/linux vmtk
head:   f3b2e27904ff7b3ad3551c83fcd234281b5b8142
commit: 4b13ac5bbca55428330930343b92cdecd6a601f4 [36/37] timekeeping: Add absolute reference for feed-forward clock discipline
config: um-allnoconfig (https://download.01.org/0day-ci/archive/20260513/202605132233.nvcOSVzq-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 5bac06718f502014fade905512f1d26d578a18f3)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260513/202605132233.nvcOSVzq-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/202605132233.nvcOSVzq-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/time/timekeeping.c:2351:2: error: use of undeclared identifier '__uint128_t'
    2351 |         __uint128_t product;
         |         ^~~~~~~~~~~
>> kernel/time/timekeeping.c:2356:2: error: use of undeclared identifier 'product'
    2356 |         product = (__uint128_t)delta * tk_ref.period_frac_sec;
         |         ^~~~~~~
   kernel/time/timekeeping.c:2356:13: error: use of undeclared identifier '__uint128_t'
    2356 |         product = (__uint128_t)delta * tk_ref.period_frac_sec;
         |                    ^~~~~~~~~~~
   kernel/time/timekeeping.c:2357:2: error: use of undeclared identifier 'product'
    2357 |         product >>= tk_ref.period_shift;
         |         ^~~~~~~
   kernel/time/timekeeping.c:2358:2: error: use of undeclared identifier 'product'
    2358 |         product += tk_ref.time_frac_sec;
         |         ^~~~~~~
   kernel/time/timekeeping.c:2359:36: error: use of undeclared identifier 'product'
    2359 |         ref_sec = tk_ref.time_sec + (u64)(product >> 64);
         |                                           ^~~~~~~
   kernel/time/timekeeping.c:2360:18: error: use of undeclared identifier 'product'
    2360 |         ref_frac = (u64)product;
         |                         ^~~~~~~
   kernel/time/timekeeping.c:1955:13: warning: variable 'suspend_timing_needed' set but not used [-Wunused-but-set-global]
    1955 | static bool suspend_timing_needed;
         |             ^
   1 warning and 7 errors generated.


vim +/__uint128_t +2351 kernel/time/timekeeping.c

  2347	
  2348	bool timekeeping_ref_ahead(struct timekeeper *tk)
  2349	{
  2350		u64 delta, ref_frac, ref_sec, ref_shifted_ns;
> 2351		__uint128_t product;
  2352	
  2353		if (tk->cs_id != tk_ref.cs_id)
  2354			return false;
  2355		delta = tk->tkr_mono.cycle_last - tk_ref.counter_value;
> 2356		product = (__uint128_t)delta * tk_ref.period_frac_sec;
  2357		product >>= tk_ref.period_shift;
  2358		product += tk_ref.time_frac_sec;
  2359		ref_sec = tk_ref.time_sec + (u64)(product >> 64);
  2360		ref_frac = (u64)product;
  2361		ref_shifted_ns = mul_u64_u64_shr(ref_frac,
  2362					(u64)NSEC_PER_SEC << tk->tkr_mono.shift, 64);
  2363		if (tk->xtime_sec > ref_sec)
  2364			return true;
  2365		if (tk->xtime_sec == ref_sec &&
  2366		    tk->tkr_mono.xtime_nsec > ref_shifted_ns)
  2367			return true;
  2368		return false;
  2369	}
  2370	/*
  2371	 * Adjust the timekeeper's multiplier to the correct frequency
  2372	 * and also to reduce the accumulated error value.
  2373	
  2374	 */
  2375	static void timekeeping_adjust(struct timekeeper *tk, s64 offset)
  2376	{
  2377		u64 ntp_tl = ntp_tick_length(tk->id);
  2378		u32 mult;
  2379	
  2380		/*
  2381		 * Determine the multiplier from the current NTP tick length.
  2382		 * Avoid expensive division when the tick length doesn't change.
  2383		 */
  2384		if (likely(tk->ntp_tick == ntp_tl)) {
  2385			mult = tk->tkr_mono.mult - tk->ntp_err_mult;
  2386		} else {
  2387			tk->ntp_tick = ntp_tl;
  2388			mult = div64_u64((tk->ntp_tick >> tk->ntp_error_shift) -
  2389					 tk->xtime_remainder, tk->cycle_interval);
  2390		}
  2391	
  2392		vmclock_host_update(tk);
  2393	
  2394		/*
  2395		 * If the clock is behind the NTP time, increase the multiplier by 1
  2396		 * to catch up with it. If it's ahead and there was a remainder in the
  2397		 * tick division, the clock will slow down. Otherwise it will stay
  2398		 * ahead until the tick length changes to a non-divisible value.
  2399		 */
  2400		if (timekeeping_has_reference())
  2401			tk->ntp_err_mult = timekeeping_ref_ahead(tk) ? 0 : 1;
  2402		else
  2403			tk->ntp_err_mult = tk->ntp_error > 0 ? 1 : 0;
  2404		mult += tk->ntp_err_mult;
  2405	
  2406		timekeeping_apply_adjustment(tk, offset, mult - tk->tkr_mono.mult);
  2407	
  2408		if (unlikely(tk->tkr_mono.clock->maxadj &&
  2409			(abs(tk->tkr_mono.mult - tk->tkr_mono.clock->mult)
  2410				> tk->tkr_mono.clock->maxadj))) {
  2411			printk_once(KERN_WARNING
  2412				"Adjusting %s more than 11%% (%ld vs %ld)\n",
  2413				tk->tkr_mono.clock->name, (long)tk->tkr_mono.mult,
  2414				(long)tk->tkr_mono.clock->mult + tk->tkr_mono.clock->maxadj);
  2415		}
  2416	
  2417		/*
  2418		 * It may be possible that when we entered this function, xtime_nsec
  2419		 * was very small.  Further, if we're slightly speeding the clocksource
  2420		 * in the code above, its possible the required corrective factor to
  2421		 * xtime_nsec could cause it to underflow.
  2422		 *
  2423		 * Now, since we have already accumulated the second and the NTP
  2424		 * subsystem has been notified via second_overflow(), we need to skip
  2425		 * the next update.
  2426		 */
  2427		if (unlikely((s64)tk->tkr_mono.xtime_nsec < 0)) {
  2428			tk->tkr_mono.xtime_nsec += (u64)NSEC_PER_SEC <<
  2429								tk->tkr_mono.shift;
  2430			tk->xtime_sec--;
  2431			tk->skip_second_overflow = 1;
  2432		}
  2433	}
  2434	

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