* [tglx-devel:cleanups 36/36] drivers/ptp/ptp_vmclock.c:154:12: error: call to undeclared function 'get_cycles'; ISO C99 and later do not support implicit function declarations
@ 2026-06-23 7:12 kernel test robot
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From: kernel test robot @ 2026-06-23 7:12 UTC (permalink / raw)
To: Thomas Gleixner; +Cc: llvm, oe-kbuild-all
tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/devel.git cleanups
head: 759e4e4e18f43902ea6f66c481a45175490cad0c
commit: 759e4e4e18f43902ea6f66c481a45175490cad0c [36/36] treewide: Remove asm/timex.h includes from generic code
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20260623/202606231516.eb6SPVb5-lkp@intel.com/config)
compiler: clang version 22.1.3 (https://github.com/llvm/llvm-project e9846648fd6183ee6d8cbdb4502213fcf902a211)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260623/202606231516.eb6SPVb5-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/202606231516.eb6SPVb5-lkp@intel.com/
All errors (new ones prefixed by >>):
>> drivers/ptp/ptp_vmclock.c:154:12: error: call to undeclared function 'get_cycles'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
154 | cycle = get_cycles();
| ^
1 error generated.
vim +/get_cycles +154 drivers/ptp/ptp_vmclock.c
20503272422693 David Woodhouse 2024-10-06 116
20503272422693 David Woodhouse 2024-10-06 117 while (1) {
20503272422693 David Woodhouse 2024-10-06 118 seq = le32_to_cpu(st->clk->seq_count) & ~1ULL;
20503272422693 David Woodhouse 2024-10-06 119
20503272422693 David Woodhouse 2024-10-06 120 /*
20503272422693 David Woodhouse 2024-10-06 121 * This pairs with a write barrier in the hypervisor
20503272422693 David Woodhouse 2024-10-06 122 * which populates this structure.
20503272422693 David Woodhouse 2024-10-06 123 */
20503272422693 David Woodhouse 2024-10-06 124 virt_rmb();
20503272422693 David Woodhouse 2024-10-06 125
20503272422693 David Woodhouse 2024-10-06 126 if (st->clk->clock_status == VMCLOCK_STATUS_UNRELIABLE)
20503272422693 David Woodhouse 2024-10-06 127 return -EINVAL;
20503272422693 David Woodhouse 2024-10-06 128
20503272422693 David Woodhouse 2024-10-06 129 /*
20503272422693 David Woodhouse 2024-10-06 130 * When invoked for gettimex64(), fill in the pre/post system
20503272422693 David Woodhouse 2024-10-06 131 * times. The simple case is when system time is based on the
20503272422693 David Woodhouse 2024-10-06 132 * same counter as st->cs_id, in which case all three times
20503272422693 David Woodhouse 2024-10-06 133 * will be derived from the *same* counter value.
20503272422693 David Woodhouse 2024-10-06 134 *
20503272422693 David Woodhouse 2024-10-06 135 * If the system isn't using the same counter, then the value
a6d799608e6a61 Thomas Gleixner 2026-05-29 136 * from ptp_read_system_prets() will still be used as pre_ts,
a6d799608e6a61 Thomas Gleixner 2026-05-29 137 * and ptp_read_system_postts() is called to populate postts
a6d799608e6a61 Thomas Gleixner 2026-05-29 138 * after calling get_cycles().
20503272422693 David Woodhouse 2024-10-06 139 */
20503272422693 David Woodhouse 2024-10-06 140 if (sts) {
a6d799608e6a61 Thomas Gleixner 2026-05-29 141 ptp_read_system_prets(sts);
a6d799608e6a61 Thomas Gleixner 2026-05-29 142 if (sts->pre_sts.cs_id == st->cs_id) {
a6d799608e6a61 Thomas Gleixner 2026-05-29 143 cycle = sts->pre_sts.cycles;
a6d799608e6a61 Thomas Gleixner 2026-05-29 144 sts->post_sts = sts->pre_sts;
bc484a5096732c David Woodhouse 2026-06-04 145 } else if (sts->pre_sts.hw_csid == st->cs_id &&
bc484a5096732c David Woodhouse 2026-06-04 146 sts->pre_sts.hw_cycles) {
bc484a5096732c David Woodhouse 2026-06-04 147 cycle = sts->pre_sts.hw_cycles;
bc484a5096732c David Woodhouse 2026-06-04 148 sts->post_sts = sts->pre_sts;
20503272422693 David Woodhouse 2024-10-06 149 } else {
de40e94c2ee6a5 Thomas Gleixner 2026-04-08 150 cycle = ptp_vmclock_read_cpu_counter();
20503272422693 David Woodhouse 2024-10-06 151 ptp_read_system_postts(sts);
20503272422693 David Woodhouse 2024-10-06 152 }
20503272422693 David Woodhouse 2024-10-06 153 } else {
20503272422693 David Woodhouse 2024-10-06 @154 cycle = get_cycles();
20503272422693 David Woodhouse 2024-10-06 155 }
20503272422693 David Woodhouse 2024-10-06 156
20503272422693 David Woodhouse 2024-10-06 157 delta = cycle - le64_to_cpu(st->clk->counter_value);
20503272422693 David Woodhouse 2024-10-06 158
20503272422693 David Woodhouse 2024-10-06 159 frac_sec = mul_u64_u64_shr_add_u64(&tspec->tv_sec, delta,
20503272422693 David Woodhouse 2024-10-06 160 le64_to_cpu(st->clk->counter_period_frac_sec),
20503272422693 David Woodhouse 2024-10-06 161 st->clk->counter_period_shift,
20503272422693 David Woodhouse 2024-10-06 162 le64_to_cpu(st->clk->time_frac_sec));
20503272422693 David Woodhouse 2024-10-06 163 tspec->tv_nsec = mul_u64_u64_shr(frac_sec, NSEC_PER_SEC, 64);
20503272422693 David Woodhouse 2024-10-06 164 tspec->tv_sec += le64_to_cpu(st->clk->time_sec);
20503272422693 David Woodhouse 2024-10-06 165
20503272422693 David Woodhouse 2024-10-06 166 if (!tai_adjust(st->clk, &tspec->tv_sec))
20503272422693 David Woodhouse 2024-10-06 167 return -EINVAL;
20503272422693 David Woodhouse 2024-10-06 168
20503272422693 David Woodhouse 2024-10-06 169 /*
20503272422693 David Woodhouse 2024-10-06 170 * This pairs with a write barrier in the hypervisor
20503272422693 David Woodhouse 2024-10-06 171 * which populates this structure.
20503272422693 David Woodhouse 2024-10-06 172 */
20503272422693 David Woodhouse 2024-10-06 173 virt_rmb();
20503272422693 David Woodhouse 2024-10-06 174 if (seq == le32_to_cpu(st->clk->seq_count))
20503272422693 David Woodhouse 2024-10-06 175 break;
20503272422693 David Woodhouse 2024-10-06 176
20503272422693 David Woodhouse 2024-10-06 177 if (ktime_after(ktime_get(), deadline))
20503272422693 David Woodhouse 2024-10-06 178 return -ETIMEDOUT;
20503272422693 David Woodhouse 2024-10-06 179 }
20503272422693 David Woodhouse 2024-10-06 180
20503272422693 David Woodhouse 2024-10-06 181 if (system_counter) {
20503272422693 David Woodhouse 2024-10-06 182 system_counter->cycles = cycle;
20503272422693 David Woodhouse 2024-10-06 183 system_counter->cs_id = st->cs_id;
20503272422693 David Woodhouse 2024-10-06 184 }
20503272422693 David Woodhouse 2024-10-06 185
20503272422693 David Woodhouse 2024-10-06 186 return 0;
20503272422693 David Woodhouse 2024-10-06 187 }
20503272422693 David Woodhouse 2024-10-06 188
:::::: The code at line 154 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>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2026-06-23 7:12 [tglx-devel:cleanups 36/36] drivers/ptp/ptp_vmclock.c:154:12: error: call to undeclared function 'get_cycles'; ISO C99 and later do not support implicit function declarations kernel test robot
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