Re: [PATCH] x86/Hyper-V: Support for free page reporting

[kbuild test robot <lkp@intel.com>]

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Hi Sunil,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20200519]
[cannot apply to tip/auto-latest linus/master tip/x86/core asm-generic/master linux/master v5.7-rc6 v5.7-rc5 v5.7-rc4 v5.7-rc6]
[if your patch is applied to the wrong git tree, please drop us a note to help
improve the system. BTW, we also suggest to use '--base' option to specify the
base tree in git format-patch, please see https://stackoverflow.com/a/37406982]

url:    https://github.com/0day-ci/linux/commits/Sunil-Muthuswamy/x86-Hyper-V-Support-for-free-page-reporting/20200520-024140
base:    fb57b1fabcb28f358901b2df90abd2b48abc1ca8
config: x86_64-allmodconfig (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce:
        # apt-get install sparse
        # sparse version: v0.6.1-193-gb8fad4bc-dirty
        # save the attached .config to linux build tree
        make C=1 ARCH=x86_64 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

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


sparse warnings: (new ones prefixed by >>)

>> drivers/hv/hv_balloon.c:1585:43: sparse: sparse: incorrect type in initializer (different address spaces) @@    expected void const [noderef] <asn:3> *__vpp_verify @@    got const [noderef] <asn:3> *__vpp_verify @@
>> drivers/hv/hv_balloon.c:1585:43: sparse:    expected void const [noderef] <asn:3> *__vpp_verify
>> drivers/hv/hv_balloon.c:1585:43: sparse:    got void [noderef] <asn:3> **

vim +1585 drivers/hv/hv_balloon.c

  1572	
  1573	#ifdef CONFIG_PAGE_REPORTING
  1574	static int hv_free_page_report(struct page_reporting_dev_info *pr_dev_info,
  1575			    struct scatterlist *sgl, unsigned int nents)
  1576	{
  1577		unsigned long flags;
  1578		struct hv_memory_hint *hint;
  1579		int i;
  1580		u64 status;
  1581		struct scatterlist *sg;
  1582	
  1583		WARN_ON(nents > HV_MAX_GPA_PAGE_RANGES);
  1584		local_irq_save(flags);
> 1585		hint = *(struct hv_memory_hint **)this_cpu_ptr(hyperv_pcpu_input_arg);
  1586		if (!hint) {
  1587			local_irq_restore(flags);
  1588			return -ENOSPC;
  1589		}
  1590	
  1591		hint->type = HV_EXT_MEMORY_HEAT_HINT_TYPE_COLD_DISCARD;
  1592		hint->reserved = 0;
  1593		for (i = 0, sg = sgl; sg; sg = sg_next(sg), i++) {
  1594			int order;
  1595			union hv_gpa_page_range *range;
  1596	
  1597			order = get_order(sg->length);
  1598			range = &hint->ranges[i];
  1599			range->address_space = 0;
  1600			range->page.largepage = 1;
  1601			range->page.additional_pages = (1ull << (order - 9)) - 1;
  1602			range->base_large_pfn = page_to_pfn(sg_page(sg)) >> 9;
  1603		}
  1604	
  1605		status = hv_do_rep_hypercall(HV_EXT_CALL_MEMORY_HEAT_HINT, nents, 0,
  1606					     hint, NULL);
  1607		local_irq_restore(flags);
  1608		status &= HV_HYPERCALL_RESULT_MASK;
  1609		if (status != HV_STATUS_SUCCESS) {
  1610			pr_err("Cold memory discard hypercall failed with status %llx\n",
  1611				status);
  1612			return -1;
  1613		}
  1614	
  1615		return 0;
  1616	}
  1617	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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