Re: [PATCH v3 1/5] x86/paravirt: Replace io_delay() hook with a bool
From: kernel test robot
Date: Thu Jan 15 2026 - 11:11:18 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: x86_64-randconfig-006-20260115 (https://download.01.org/0day-ci/archive/20260115/202601152321.kJ6D4yKM-lkp@xxxxxxxxx/config)
compiler: gcc-12 (Debian 12.4.0-5) 12.4.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260115/202601152321.kJ6D4yKM-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/202601152321.kJ6D4yKM-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
arch/x86/kernel/tboot.c: In function 'tboot_shutdown':
>> arch/x86/kernel/tboot.c:255:17: error: implicit declaration of function 'halt' [-Werror=implicit-function-declaration]
255 | halt();
| ^~~~
cc1: some warnings being treated as errors
vim +/halt +255 arch/x86/kernel/tboot.c
58c41d28259c24 H. Peter Anvin 2009-08-14 225
3162534069597e Joseph Cihula 2009-06-30 226 void tboot_shutdown(u32 shutdown_type)
3162534069597e Joseph Cihula 2009-06-30 227 {
3162534069597e Joseph Cihula 2009-06-30 228 void (*shutdown)(void);
3162534069597e Joseph Cihula 2009-06-30 229
3162534069597e Joseph Cihula 2009-06-30 230 if (!tboot_enabled())
3162534069597e Joseph Cihula 2009-06-30 231 return;
3162534069597e Joseph Cihula 2009-06-30 232
11520e5e7c1855 Linus Torvalds 2012-12-15 233 /*
11520e5e7c1855 Linus Torvalds 2012-12-15 234 * if we're being called before the 1:1 mapping is set up then just
11520e5e7c1855 Linus Torvalds 2012-12-15 235 * return and let the normal shutdown happen; this should only be
11520e5e7c1855 Linus Torvalds 2012-12-15 236 * due to very early panic()
11520e5e7c1855 Linus Torvalds 2012-12-15 237 */
11520e5e7c1855 Linus Torvalds 2012-12-15 238 if (!tboot_pg_dir)
11520e5e7c1855 Linus Torvalds 2012-12-15 239 return;
11520e5e7c1855 Linus Torvalds 2012-12-15 240
3162534069597e Joseph Cihula 2009-06-30 241 /* if this is S3 then set regions to MAC */
3162534069597e Joseph Cihula 2009-06-30 242 if (shutdown_type == TB_SHUTDOWN_S3)
58c41d28259c24 H. Peter Anvin 2009-08-14 243 if (tboot_setup_sleep())
58c41d28259c24 H. Peter Anvin 2009-08-14 244 return;
3162534069597e Joseph Cihula 2009-06-30 245
3162534069597e Joseph Cihula 2009-06-30 246 tboot->shutdown_type = shutdown_type;
3162534069597e Joseph Cihula 2009-06-30 247
3162534069597e Joseph Cihula 2009-06-30 248 switch_to_tboot_pt();
3162534069597e Joseph Cihula 2009-06-30 249
3162534069597e Joseph Cihula 2009-06-30 250 shutdown = (void(*)(void))(unsigned long)tboot->shutdown_entry;
3162534069597e Joseph Cihula 2009-06-30 251 shutdown();
3162534069597e Joseph Cihula 2009-06-30 252
3162534069597e Joseph Cihula 2009-06-30 253 /* should not reach here */
3162534069597e Joseph Cihula 2009-06-30 254 while (1)
3162534069597e Joseph Cihula 2009-06-30 @255 halt();
3162534069597e Joseph Cihula 2009-06-30 256 }
3162534069597e Joseph Cihula 2009-06-30 257
--
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