linux-kernel - Re: [PATCH v2] x86/hyperv: Fix kdump on Azure CVMs

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Message-ID: <202508200507.78h11riS-lkp@intel.com>
Date: Wed, 20 Aug 2025 05:19:59 +0800
From: kernel test robot <lkp@...el.com>
To: Vitaly Kuznetsov <vkuznets@...hat.com>, linux-hyperv@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev, "K. Y. Srinivasan" <kys@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
	x86@...nel.org, linux-kernel@...r.kernel.org,
	Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
	Tianyu Lan <tiala@...rosoft.com>,
	Michael Kelley <mhklinux@...look.com>, Li Tian <litian@...hat.com>,
	Philipp Rudo <prudo@...hat.com>
Subject: Re: [PATCH v2] x86/hyperv: Fix kdump on Azure CVMs

Hi Vitaly,

kernel test robot noticed the following build warnings:

[auto build test WARNING on tip/x86/core]
[also build test WARNING on arm64/for-next/core tip/master linus/master v6.17-rc2]
[cannot apply to tip/auto-latest next-20250819]
[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/Vitaly-Kuznetsov/x86-hyperv-Fix-kdump-on-Azure-CVMs/20250818-175830
base:   tip/x86/core
patch link:    https://lore.kernel.org/r/20250818095400.1610209-1-vkuznets%40redhat.com
patch subject: [PATCH v2] x86/hyperv: Fix kdump on Azure CVMs
config: x86_64-randconfig-101-20250819 (https://download.01.org/0day-ci/archive/20250820/202508200507.78h11riS-lkp@intel.com/config)
compiler: clang version 20.1.8 (https://github.com/llvm/llvm-project 87f0227cb60147a26a1eeb4fb06e3b505e9c7261)

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/202508200507.78h11riS-lkp@intel.com/

cocci warnings: (new ones prefixed by >>)
>> arch/x86/hyperv/ivm.c:601:2-3: Unneeded semicolon
   arch/x86/hyperv/ivm.c:504:3-4: Unneeded semicolon
   arch/x86/hyperv/ivm.c:561:3-4: Unneeded semicolon

vim +601 arch/x86/hyperv/ivm.c

   565	
   566	void hv_ivm_clear_host_access(void)
   567	{
   568		struct hv_gpa_range_for_visibility *input;
   569		struct hv_enc_pfn_region *ent;
   570		unsigned long flags;
   571		u64 hv_status;
   572		int cur, i;
   573	
   574		if (!hv_is_isolation_supported())
   575			return;
   576	
   577		raw_spin_lock_irqsave(&hv_list_enc_lock, flags);
   578	
   579		input = *this_cpu_ptr(hyperv_pcpu_input_arg);
   580		if (!input)
   581			goto unlock;
   582	
   583		list_for_each_entry(ent, &hv_list_enc, list) {
   584			for (i = 0, cur = 0; i < ent->count; i++) {
   585				input->gpa_page_list[cur] = ent->pfn + i;
   586				cur++;
   587	
   588				if (cur == HV_MAX_MODIFY_GPA_REP_COUNT || i == ent->count - 1) {
   589					input->partition_id = HV_PARTITION_ID_SELF;
   590					input->host_visibility = VMBUS_PAGE_NOT_VISIBLE;
   591					input->reserved0 = 0;
   592					input->reserved1 = 0;
   593					hv_status = hv_do_rep_hypercall(
   594						HVCALL_MODIFY_SPARSE_GPA_PAGE_HOST_VISIBILITY,
   595						cur, 0, input, NULL);
   596					WARN_ON_ONCE(!hv_result_success(hv_status));
   597					cur = 0;
   598				}
   599			}
   600	
 > 601		};
   602	
   603	unlock:
   604		raw_spin_unlock_irqrestore(&hv_list_enc_lock, flags);
   605	}
   606	EXPORT_SYMBOL_GPL(hv_ivm_clear_host_access);
   607	

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