Re: [PATCH v3 1/5] x86/paravirt: Replace io_delay() hook with a bool
From: kernel test robot
Date: Thu Jan 15 2026 - 09:44:13 EST
Hi Juergen,
kernel test robot noticed the following build errors:
[auto build test ERROR on tip/master]
[also build test ERROR on next-20260115]
[cannot apply to kvm/queue kvm/next tip/x86/core kvm/linux-next tip/auto-latest linus/master v6.19-rc5]
[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/Juergen-Gross/x86-paravirt-Replace-io_delay-hook-with-a-bool/20260115-165320
base: tip/master
patch link: https://lore.kernel.org/r/20260115084849.31502-2-jgross%40suse.com
patch subject: [PATCH v3 1/5] x86/paravirt: Replace io_delay() hook with a bool
config: i386-randconfig-011-20260115 (https://download.01.org/0day-ci/archive/20260115/202601152203.plJOoOEF-lkp@xxxxxxxxx/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260115/202601152203.plJOoOEF-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601152203.plJOoOEF-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
>> drivers/cpufreq/longhaul.c:145:2: error: call to undeclared function 'arch_safe_halt'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
145 | safe_halt();
| ^
include/linux/irqflags.h:231:3: note: expanded from macro 'safe_halt'
231 | raw_safe_halt(); \
| ^
include/linux/irqflags.h:192:27: note: expanded from macro 'raw_safe_halt'
192 | #define raw_safe_halt() arch_safe_halt()
| ^
>> drivers/cpufreq/longhaul.c:150:2: error: call to undeclared function 'halt'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
150 | halt();
| ^
drivers/cpufreq/longhaul.c:179:2: error: call to undeclared function 'arch_safe_halt'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
179 | safe_halt();
| ^
include/linux/irqflags.h:231:3: note: expanded from macro 'safe_halt'
231 | raw_safe_halt(); \
| ^
include/linux/irqflags.h:192:27: note: expanded from macro 'raw_safe_halt'
192 | #define raw_safe_halt() arch_safe_halt()
| ^
drivers/cpufreq/longhaul.c:187:4: error: call to undeclared function 'halt'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
187 | halt();
| ^
drivers/cpufreq/longhaul.c:205:3: error: call to undeclared function 'halt'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
205 | halt();
| ^
drivers/cpufreq/longhaul.c:224:4: error: call to undeclared function 'halt'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
224 | halt();
| ^
drivers/cpufreq/longhaul.c:165:6: warning: variable 't' set but not used [-Wunused-but-set-variable]
165 | u32 t;
| ^
1 warning and 6 errors generated.
vim +/arch_safe_halt +145 drivers/cpufreq/longhaul.c
^1da177e4c3f41 arch/i386/kernel/cpu/cpufreq/longhaul.c Linus Torvalds 2005-04-16 134
ac617bd0f7b959 arch/x86/kernel/cpu/cpufreq/longhaul.c Dave Jones 2009-01-17 135 static void do_longhaul1(unsigned int mults_index)
^1da177e4c3f41 arch/i386/kernel/cpu/cpufreq/longhaul.c Linus Torvalds 2005-04-16 136 {
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 137 union msr_bcr2 bcr2;
^1da177e4c3f41 arch/i386/kernel/cpu/cpufreq/longhaul.c Linus Torvalds 2005-04-16 138
c435e608cf59ff drivers/cpufreq/longhaul.c Ingo Molnar 2025-04-09 139 rdmsrq(MSR_VIA_BCR2, bcr2.val);
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 140 /* Enable software clock multiplier */
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 141 bcr2.bits.ESOFTBF = 1;
ac617bd0f7b959 arch/x86/kernel/cpu/cpufreq/longhaul.c Dave Jones 2009-01-17 142 bcr2.bits.CLOCKMUL = mults_index & 0xff;
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 143
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 144 /* Sync to timer tick */
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 @145 safe_halt();
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 146 /* Change frequency on next halt or sleep */
78255eb2397332 drivers/cpufreq/longhaul.c Ingo Molnar 2025-04-09 147 wrmsrq(MSR_VIA_BCR2, bcr2.val);
179da8e6e8903a arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-08-08 148 /* Invoke transition */
179da8e6e8903a arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-08-08 149 ACPI_FLUSH_CPU_CACHE();
179da8e6e8903a arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-08-08 @150 halt();
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 151
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 152 /* Disable software clock multiplier */
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 153 local_irq_disable();
c435e608cf59ff drivers/cpufreq/longhaul.c Ingo Molnar 2025-04-09 154 rdmsrq(MSR_VIA_BCR2, bcr2.val);
dadb49d8746bc4 arch/i386/kernel/cpu/cpufreq/longhaul.c Rafa� Bilski 2006-07-03 155 bcr2.bits.ESOFTBF = 0;
78255eb2397332 drivers/cpufreq/longhaul.c Ingo Molnar 2025-04-09 156 wrmsrq(MSR_VIA_BCR2, bcr2.val);
^1da177e4c3f41 arch/i386/kernel/cpu/cpufreq/longhaul.c Linus Torvalds 2005-04-16 157 }
^1da177e4c3f41 arch/i386/kernel/cpu/cpufreq/longhaul.c Linus Torvalds 2005-04-16 158
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