tree:   https://github.com/meghadey/crypto iommu_debugfs_improvements
head:   54d8336f22d5d2c374d54ed5db5e38da5e350370
commit: 54d8336f22d5d2c374d54ed5db5e38da5e350370 [2/2] iommu/vt-d: Populate debugfs if either dma or interrupt remapping is enabled
config: i386-randconfig-c003-20200228 (attached as .config)
compiler: gcc-7 (Debian 7.5.0-5) 7.5.0
reproduce:
        git checkout 54d8336f22d5d2c374d54ed5db5e38da5e350370
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

   In file included from include/linux/init.h:5:0,
                    from drivers//iommu/intel-iommu.c:16:
   drivers//iommu/intel-iommu.c: In function 'intel_iommu_init':
   drivers//iommu/intel-iommu.c:5137:21: error: 'disable_irq_remap' undeclared (first use in this function); did you mean 'disable_irq_wake'?
     if (!no_iommu && (!disable_irq_remap || !dmar_disabled))
                        ^
   include/linux/compiler.h:58:52: note: in definition of macro '__trace_if_var'
    #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                       ^~~~
>> drivers//iommu/intel-iommu.c:5137:2: note: in expansion of macro 'if'
     if (!no_iommu && (!disable_irq_remap || !dmar_disabled))
     ^~
   drivers//iommu/intel-iommu.c:5137:21: note: each undeclared identifier is reported only once for each function it appears in
     if (!no_iommu && (!disable_irq_remap || !dmar_disabled))
                        ^
   include/linux/compiler.h:58:52: note: in definition of macro '__trace_if_var'
    #define __trace_if_var(cond) (__builtin_constant_p(cond) ? (cond) : __trace_if_value(cond))
                                                       ^~~~
>> drivers//iommu/intel-iommu.c:5137:2: note: in expansion of macro 'if'
     if (!no_iommu && (!disable_irq_remap || !dmar_disabled))
     ^~

vim +/if +5137 drivers//iommu/intel-iommu.c

  5091	
  5092	int __init intel_iommu_init(void)
  5093	{
  5094		int ret = -ENODEV;
  5095		struct dmar_drhd_unit *drhd;
  5096		struct intel_iommu *iommu;
  5097	
  5098		/*
  5099		 * Intel IOMMU is required for a TXT/tboot launch or platform
  5100		 * opt in, so enforce that.
  5101		 */
  5102		force_on = tboot_force_iommu() || platform_optin_force_iommu();
  5103	
  5104		if (iommu_init_mempool()) {
  5105			if (force_on)
  5106				panic("tboot: Failed to initialize iommu memory\n");
  5107			return -ENOMEM;
  5108		}
  5109	
  5110		down_write(&dmar_global_lock);
  5111		if (dmar_table_init()) {
  5112			if (force_on)
  5113				panic("tboot: Failed to initialize DMAR table\n");
  5114			goto out_free_dmar;
  5115		}
  5116	
  5117		if (dmar_dev_scope_init() < 0) {
  5118			if (force_on)
  5119				panic("tboot: Failed to initialize DMAR device scope\n");
  5120			goto out_free_dmar;
  5121		}
  5122	
  5123		up_write(&dmar_global_lock);
  5124	
  5125		/*
  5126		 * The bus notifier takes the dmar_global_lock, so lockdep will
  5127		 * complain later when we register it under the lock.
  5128		 */
  5129		dmar_register_bus_notifier();
  5130	
  5131		down_write(&dmar_global_lock);
  5132	
  5133		/*
  5134		 * Create iommu debugfs directory if iommu is present and either DMA
  5135		 * or IRQ remapping is enabled.
  5136		 */
> 5137		if (!no_iommu && (!disable_irq_remap || !dmar_disabled))
  5138			intel_iommu_debugfs_init();
  5139	
  5140		if (no_iommu || dmar_disabled) {
  5141			/*
  5142			 * We exit the function here to ensure IOMMU's remapping and
  5143			 * mempool aren't setup, which means that the IOMMU's PMRs
  5144			 * won't be disabled via the call to init_dmars(). So disable
  5145			 * it explicitly here. The PMRs were setup by tboot prior to
  5146			 * calling SENTER, but the kernel is expected to reset/tear
  5147			 * down the PMRs.
  5148			 */
  5149			if (intel_iommu_tboot_noforce) {
  5150				for_each_iommu(iommu, drhd)
  5151					iommu_disable_protect_mem_regions(iommu);
  5152			}
  5153	
  5154			/*
  5155			 * Make sure the IOMMUs are switched off, even when we
  5156			 * boot into a kexec kernel and the previous kernel left
  5157			 * them enabled
  5158			 */
  5159			intel_disable_iommus();
  5160			goto out_free_dmar;
  5161		}
  5162	
  5163		if (list_empty(&dmar_rmrr_units))
  5164			pr_info("No RMRR found\n");
  5165	
  5166		if (list_empty(&dmar_atsr_units))
  5167			pr_info("No ATSR found\n");
  5168	
  5169		if (dmar_init_reserved_ranges()) {
  5170			if (force_on)
  5171				panic("tboot: Failed to reserve iommu ranges\n");
  5172			goto out_free_reserved_range;
  5173		}
  5174	
  5175		if (dmar_map_gfx)
  5176			intel_iommu_gfx_mapped = 1;
  5177	
  5178		init_no_remapping_devices();
  5179	
  5180		ret = init_dmars();
  5181		if (ret) {
  5182			if (force_on)
  5183				panic("tboot: Failed to initialize DMARs\n");
  5184			pr_err("Initialization failed\n");
  5185			goto out_free_reserved_range;
  5186		}
  5187		up_write(&dmar_global_lock);
  5188	

---
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