linux-kernel - Re: [PATCH v2] x86/xen: Combine PV features to be disabled in xen

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Date:   Wed, 30 May 2018 23:26:53 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Joao Martins <joao.m.martins@...cle.com>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org,
        Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        Juergen Gross <jgross@...e.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org, Jonathan Corbet <corbet@....net>,
        linux-doc@...r.kernel.org, Joao Martins <joao.m.martins@...cle.com>
Subject: Re: [PATCH v2] x86/xen: Combine PV features to be disabled in
 xen_nopv

Hi Konrad,

I love your patch! Yet something to improve:

[auto build test ERROR on xen-tip/linux-next]
[also build test ERROR on v4.17-rc7 next-20180529]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Joao-Martins/x86-xen-Combine-PV-features-to-be-disabled-in-xen_nopv/20180530-031040
base:   https://git.kernel.org/pub/scm/linux/kernel/git/xen/tip.git linux-next
config: x86_64-randconfig-s4-05301434 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All errors (new ones prefixed by >>):

   arch/x86/xen/smp.o: In function `xen_smp_intr_init':
>> arch/x86/xen/smp.c:76: undefined reference to `xen_nopv_ipi'
   arch/x86/xen/spinlock.o: In function `xen_init_lock_cpu':
>> arch/x86/xen/spinlock.c:82: undefined reference to `xen_nopv_spin'
   arch/x86/xen/spinlock.o: In function `xen_uninit_lock_cpu':
   arch/x86/xen/spinlock.c:110: undefined reference to `xen_nopv_spin'
   arch/x86/xen/spinlock.o: In function `xen_parse_nopvspin':
>> arch/x86/xen/spinlock.c:148: undefined reference to `xen_set_nopv'
   arch/x86/xen/spinlock.o: In function `xen_init_spinlocks':
   arch/x86/xen/spinlock.c:132: undefined reference to `xen_nopv_spin'

vim +76 arch/x86/xen/smp.c

    61	
    62	int xen_smp_intr_init(unsigned int cpu)
    63	{
    64		int rc;
    65		char *resched_name, *callfunc_name, *debug_name;
    66	
    67		debug_name = kasprintf(GFP_KERNEL, "debug%d", cpu);
    68		rc = bind_virq_to_irqhandler(VIRQ_DEBUG, cpu, xen_debug_interrupt,
    69					     IRQF_PERCPU | IRQF_NOBALANCING,
    70					     debug_name, NULL);
    71		if (rc < 0)
    72			goto fail;
    73		per_cpu(xen_debug_irq, cpu).irq = rc;
    74		per_cpu(xen_debug_irq, cpu).name = debug_name;
    75	
  > 76		if (xen_hvm_domain() && xen_nopv_ipi())
    77			return 0;
    78	
    79		resched_name = kasprintf(GFP_KERNEL, "resched%d", cpu);
    80		rc = bind_ipi_to_irqhandler(XEN_RESCHEDULE_VECTOR,
    81					    cpu,
    82					    xen_reschedule_interrupt,
    83					    IRQF_PERCPU|IRQF_NOBALANCING,
    84					    resched_name,
    85					    NULL);
    86		if (rc < 0)
    87			goto fail;
    88		per_cpu(xen_resched_irq, cpu).irq = rc;
    89		per_cpu(xen_resched_irq, cpu).name = resched_name;
    90	
    91		callfunc_name = kasprintf(GFP_KERNEL, "callfunc%d", cpu);
    92		rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_VECTOR,
    93					    cpu,
    94					    xen_call_function_interrupt,
    95					    IRQF_PERCPU|IRQF_NOBALANCING,
    96					    callfunc_name,
    97					    NULL);
    98		if (rc < 0)
    99			goto fail;
   100		per_cpu(xen_callfunc_irq, cpu).irq = rc;
   101		per_cpu(xen_callfunc_irq, cpu).name = callfunc_name;
   102	
   103		callfunc_name = kasprintf(GFP_KERNEL, "callfuncsingle%d", cpu);
   104		rc = bind_ipi_to_irqhandler(XEN_CALL_FUNCTION_SINGLE_VECTOR,
   105					    cpu,
   106					    xen_call_function_single_interrupt,
   107					    IRQF_PERCPU|IRQF_NOBALANCING,
   108					    callfunc_name,
   109					    NULL);
   110		if (rc < 0)
   111			goto fail;
   112		per_cpu(xen_callfuncsingle_irq, cpu).irq = rc;
   113		per_cpu(xen_callfuncsingle_irq, cpu).name = callfunc_name;
   114	
   115		return 0;
   116	
   117	 fail:
   118		xen_smp_intr_free(cpu);
   119		return rc;
   120	}
   121	

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