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Message-ID: <202511271747.smpLdjsz-lkp@intel.com>
Date: Thu, 27 Nov 2025 17:24:18 +0800
From: kernel test robot <lkp@...el.com>
To: Juergen Gross <jgross@...e.com>, linux-kernel@...r.kernel.org,
x86@...nel.org, linux-hyperv@...r.kernel.org,
virtualization@...ts.linux.dev, kvm@...r.kernel.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
Juergen Gross <jgross@...e.com>,
"K. Y. Srinivasan" <kys@...rosoft.com>,
Haiyang Zhang <haiyangz@...rosoft.com>,
Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
Thomas Gleixner <tglx@...utronix.de>,
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>,
Josh Poimboeuf <jpoimboe@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
xen-devel@...ts.xenproject.org
Subject: Re: [PATCH v4 21/21] x86/pvlocks: Move paravirt spinlock functions
into own header
Hi Juergen,
kernel test robot noticed the following build errors:
[auto build test ERROR on tip/x86/core]
[also build test ERROR on tip/sched/core kvm/queue kvm/next linus/master v6.18-rc7]
[cannot apply to kvm/linux-next next-20251127]
[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-Remove-not-needed-includes-of-paravirt-h/20251127-152054
base: tip/x86/core
patch link: https://lore.kernel.org/r/20251127070844.21919-22-jgross%40suse.com
patch subject: [PATCH v4 21/21] x86/pvlocks: Move paravirt spinlock functions into own header
config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20251127/202511271747.smpLdjsz-lkp@intel.com/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/20251127/202511271747.smpLdjsz-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/202511271747.smpLdjsz-lkp@intel.com/
All errors (new ones prefixed by >>):
>> arch/x86/kernel/alternative.c:2373:2: error: call to undeclared function 'paravirt_set_cap'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
2373 | paravirt_set_cap();
| ^
arch/x86/kernel/alternative.c:2373:2: note: did you mean 'paravirt_ret0'?
arch/x86/include/asm/paravirt-base.h:23:15: note: 'paravirt_ret0' declared here
23 | unsigned long paravirt_ret0(void);
| ^
1 error generated.
vim +/paravirt_set_cap +2373 arch/x86/kernel/alternative.c
270a69c4485d7d arch/x86/kernel/alternative.c Peter Zijlstra 2023-02-08 2344
9a0b5817ad97bb arch/i386/kernel/alternative.c Gerd Hoffmann 2006-03-23 2345 void __init alternative_instructions(void)
9a0b5817ad97bb arch/i386/kernel/alternative.c Gerd Hoffmann 2006-03-23 2346 {
ebebe30794d38c arch/x86/kernel/alternative.c Pawan Gupta 2025-05-03 2347 u64 ibt;
ebebe30794d38c arch/x86/kernel/alternative.c Pawan Gupta 2025-05-03 2348
7457c0da024b18 arch/x86/kernel/alternative.c Peter Zijlstra 2019-05-03 2349 int3_selftest();
7457c0da024b18 arch/x86/kernel/alternative.c Peter Zijlstra 2019-05-03 2350
7457c0da024b18 arch/x86/kernel/alternative.c Peter Zijlstra 2019-05-03 2351 /*
7457c0da024b18 arch/x86/kernel/alternative.c Peter Zijlstra 2019-05-03 2352 * The patching is not fully atomic, so try to avoid local
7457c0da024b18 arch/x86/kernel/alternative.c Peter Zijlstra 2019-05-03 2353 * interruptions that might execute the to be patched code.
7457c0da024b18 arch/x86/kernel/alternative.c Peter Zijlstra 2019-05-03 2354 * Other CPUs are not running.
7457c0da024b18 arch/x86/kernel/alternative.c Peter Zijlstra 2019-05-03 2355 */
8f4e956b313dcc arch/i386/kernel/alternative.c Andi Kleen 2007-07-22 2356 stop_nmi();
123aa76ec0cab5 arch/x86/kernel/alternative.c Andi Kleen 2009-02-12 2357
123aa76ec0cab5 arch/x86/kernel/alternative.c Andi Kleen 2009-02-12 2358 /*
123aa76ec0cab5 arch/x86/kernel/alternative.c Andi Kleen 2009-02-12 2359 * Don't stop machine check exceptions while patching.
123aa76ec0cab5 arch/x86/kernel/alternative.c Andi Kleen 2009-02-12 2360 * MCEs only happen when something got corrupted and in this
123aa76ec0cab5 arch/x86/kernel/alternative.c Andi Kleen 2009-02-12 2361 * case we must do something about the corruption.
32b1cbe380417f arch/x86/kernel/alternative.c Marco Ammon 2019-09-02 2362 * Ignoring it is worse than an unlikely patching race.
123aa76ec0cab5 arch/x86/kernel/alternative.c Andi Kleen 2009-02-12 2363 * Also machine checks tend to be broadcast and if one CPU
123aa76ec0cab5 arch/x86/kernel/alternative.c Andi Kleen 2009-02-12 2364 * goes into machine check the others follow quickly, so we don't
123aa76ec0cab5 arch/x86/kernel/alternative.c Andi Kleen 2009-02-12 2365 * expect a machine check to cause undue problems during to code
123aa76ec0cab5 arch/x86/kernel/alternative.c Andi Kleen 2009-02-12 2366 * patching.
123aa76ec0cab5 arch/x86/kernel/alternative.c Andi Kleen 2009-02-12 2367 */
8f4e956b313dcc arch/i386/kernel/alternative.c Andi Kleen 2007-07-22 2368
4e6292114c7412 arch/x86/kernel/alternative.c Juergen Gross 2021-03-11 2369 /*
f7af6977621a41 arch/x86/kernel/alternative.c Juergen Gross 2023-12-10 2370 * Make sure to set (artificial) features depending on used paravirt
f7af6977621a41 arch/x86/kernel/alternative.c Juergen Gross 2023-12-10 2371 * functions which can later influence alternative patching.
4e6292114c7412 arch/x86/kernel/alternative.c Juergen Gross 2021-03-11 2372 */
4e6292114c7412 arch/x86/kernel/alternative.c Juergen Gross 2021-03-11 @2373 paravirt_set_cap();
4e6292114c7412 arch/x86/kernel/alternative.c Juergen Gross 2021-03-11 2374
ebebe30794d38c arch/x86/kernel/alternative.c Pawan Gupta 2025-05-03 2375 /* Keep CET-IBT disabled until caller/callee are patched */
ebebe30794d38c arch/x86/kernel/alternative.c Pawan Gupta 2025-05-03 2376 ibt = ibt_save(/*disable*/ true);
ebebe30794d38c arch/x86/kernel/alternative.c Pawan Gupta 2025-05-03 2377
931ab63664f02b arch/x86/kernel/alternative.c Peter Zijlstra 2022-10-27 2378 __apply_fineibt(__retpoline_sites, __retpoline_sites_end,
1d7e707af44613 arch/x86/kernel/alternative.c Mike Rapoport (Microsoft 2025-01-26 2379) __cfi_sites, __cfi_sites_end, true);
026211c40b0554 arch/x86/kernel/alternative.c Kees Cook 2025-09-03 2380 cfi_debug = false;
931ab63664f02b arch/x86/kernel/alternative.c Peter Zijlstra 2022-10-27 2381
7508500900814d arch/x86/kernel/alternative.c Peter Zijlstra 2021-10-26 2382 /*
7508500900814d arch/x86/kernel/alternative.c Peter Zijlstra 2021-10-26 2383 * Rewrite the retpolines, must be done before alternatives since
7508500900814d arch/x86/kernel/alternative.c Peter Zijlstra 2021-10-26 2384 * those can rewrite the retpoline thunks.
7508500900814d arch/x86/kernel/alternative.c Peter Zijlstra 2021-10-26 2385 */
1d7e707af44613 arch/x86/kernel/alternative.c Mike Rapoport (Microsoft 2025-01-26 2386) apply_retpolines(__retpoline_sites, __retpoline_sites_end);
1d7e707af44613 arch/x86/kernel/alternative.c Mike Rapoport (Microsoft 2025-01-26 2387) apply_returns(__return_sites, __return_sites_end);
7508500900814d arch/x86/kernel/alternative.c Peter Zijlstra 2021-10-26 2388
a82b26451de126 arch/x86/kernel/alternative.c Peter Zijlstra (Intel 2025-06-03 2389) its_fini_core();
a82b26451de126 arch/x86/kernel/alternative.c Peter Zijlstra (Intel 2025-06-03 2390)
e81dc127ef6988 arch/x86/kernel/alternative.c Thomas Gleixner 2022-09-15 2391 /*
ab9fea59487d8b arch/x86/kernel/alternative.c Peter Zijlstra 2025-02-07 2392 * Adjust all CALL instructions to point to func()-10, including
ab9fea59487d8b arch/x86/kernel/alternative.c Peter Zijlstra 2025-02-07 2393 * those in .altinstr_replacement.
e81dc127ef6988 arch/x86/kernel/alternative.c Thomas Gleixner 2022-09-15 2394 */
e81dc127ef6988 arch/x86/kernel/alternative.c Thomas Gleixner 2022-09-15 2395 callthunks_patch_builtin_calls();
e81dc127ef6988 arch/x86/kernel/alternative.c Thomas Gleixner 2022-09-15 2396
ab9fea59487d8b arch/x86/kernel/alternative.c Peter Zijlstra 2025-02-07 2397 apply_alternatives(__alt_instructions, __alt_instructions_end);
ab9fea59487d8b arch/x86/kernel/alternative.c Peter Zijlstra 2025-02-07 2398
be0fffa5ca894a arch/x86/kernel/alternative.c Peter Zijlstra 2023-06-22 2399 /*
be0fffa5ca894a arch/x86/kernel/alternative.c Peter Zijlstra 2023-06-22 2400 * Seal all functions that do not have their address taken.
be0fffa5ca894a arch/x86/kernel/alternative.c Peter Zijlstra 2023-06-22 2401 */
1d7e707af44613 arch/x86/kernel/alternative.c Mike Rapoport (Microsoft 2025-01-26 2402) apply_seal_endbr(__ibt_endbr_seal, __ibt_endbr_seal_end);
ed53a0d971926e arch/x86/kernel/alternative.c Peter Zijlstra 2022-03-08 2403
ebebe30794d38c arch/x86/kernel/alternative.c Pawan Gupta 2025-05-03 2404 ibt_restore(ibt);
ebebe30794d38c arch/x86/kernel/alternative.c Pawan Gupta 2025-05-03 2405
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