linux-kernel - [tip:WIP.x86/paravirt 7/8] arch/x86/events/intel/ds.c:359:17: sparse: sparse: incorrect type in initializer (different address spaces)

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Date:   Thu, 25 Apr 2019 23:40:13 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     kbuild-all@...org, linux-kernel@...r.kernel.org, tipbuild@...or.com
Subject: [tip:WIP.x86/paravirt 7/8] arch/x86/events/intel/ds.c:359:17:
 sparse: sparse: incorrect type in initializer (different address spaces)

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git WIP.x86/paravirt
head:   269b8685f55e335b82b64f9858a751ba3d5ea8d8
commit: 124d6af5a5f559e516ed2c6ea857e889ed293b43 [7/8] x86/paravirt: Standardize 'insn_buff' variable names
reproduce:
        # apt-get install sparse
        git checkout 124d6af5a5f559e516ed2c6ea857e889ed293b43
        make ARCH=x86_64 allmodconfig
        make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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


sparse warnings: (new ones prefixed by >>)

>> arch/x86/events/intel/ds.c:359:17: sparse: sparse: incorrect type in initializer (different address spaces) @@    expected void const [noderef] <asn:3> *__vpp_verify @@    got sn:3> *__vpp_verify @@
>> arch/x86/events/intel/ds.c:359:17: sparse:    expected void const [noderef] <asn:3> *__vpp_verify
>> arch/x86/events/intel/ds.c:359:17: sparse:    got void **

vim +359 arch/x86/events/intel/ds.c

   333	
   334	static int alloc_pebs_buffer(int cpu)
   335	{
   336		struct cpu_hw_events *hwev = per_cpu_ptr(&cpu_hw_events, cpu);
   337		struct debug_store *ds = hwev->ds;
   338		size_t bsiz = x86_pmu.pebs_buffer_size;
   339		int max, node = cpu_to_node(cpu);
   340		void *buffer, *insn_buff, *cea;
   341	
   342		if (!x86_pmu.pebs)
   343			return 0;
   344	
   345		buffer = dsalloc_pages(bsiz, GFP_KERNEL, cpu);
   346		if (unlikely(!buffer))
   347			return -ENOMEM;
   348	
   349		/*
   350		 * HSW+ already provides us the eventing ip; no need to allocate this
   351		 * buffer then.
   352		 */
   353		if (x86_pmu.intel_cap.pebs_format < 2) {
   354			insn_buff = kzalloc_node(PEBS_FIXUP_SIZE, GFP_KERNEL, node);
   355			if (!insn_buff) {
   356				dsfree_pages(buffer, bsiz);
   357				return -ENOMEM;
   358			}
 > 359			per_cpu(insn_buff, cpu) = insn_buff;
   360		}
   361		hwev->ds_pebs_vaddr = buffer;
   362		/* Update the cpu entry area mapping */
   363		cea = &get_cpu_entry_area(cpu)->cpu_debug_buffers.pebs_buffer;
   364		ds->pebs_buffer_base = (unsigned long) cea;
   365		ds_update_cea(cea, buffer, bsiz, PAGE_KERNEL);
   366		ds->pebs_index = ds->pebs_buffer_base;
   367		max = x86_pmu.pebs_record_size * (bsiz / x86_pmu.pebs_record_size);
   368		ds->pebs_absolute_maximum = ds->pebs_buffer_base + max;
   369		return 0;
   370	}
   371	

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0-DAY kernel test infrastructure                Open Source Technology Center
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