linux-kernel - Re: [PATCH v3 1/5] x86/paravirt: Replace io

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Message-ID: <202601152321.kJ6D4yKM-lkp@intel.com>
Date: Fri, 16 Jan 2026 00:10:12 +0800
From: kernel test robot <lkp@...el.com>
To: Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, virtualization@...ts.linux.dev, kvm@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, Juergen Gross <jgross@...e.com>,
	Thomas Gleixner <tglx@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Ajay Kaher <ajay.kaher@...adcom.com>,
	Alexey Makhalov <alexey.makhalov@...adcom.com>,
	Broadcom internal kernel review list <bcm-kernel-feedback-list@...adcom.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v3 1/5] x86/paravirt: Replace io_delay() hook with a bool

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@intel.com/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@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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601152321.kJ6D4yKM-lkp@intel.com/

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  

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki