linux-kernel - Re: [PATCH v8 7/7] PCI: hv: New paravirtual PCI front-end for Hyper-V VMs

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Message-ID: <201512100532.3QekklZi%fengguang.wu@intel.com>
Date:	Thu, 10 Dec 2015 05:40:21 +0800
From:	kbuild test robot <lkp@...el.com>
To:	jakeo@...rosoft.com
Cc:	kbuild-all@...org, gregkh@...uxfoundation.org, kys@...rosoft.com,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	olaf@...fle.de, apw@...onical.com, vkuznets@...hat.com,
	tglx@...utronix.de, haiyangz@...rosoft.com, marc.zyngier@....com,
	bhelgaas@...gle.com, linux-pci@...r.kernel.org,
	Jake Oshins <jakeo@...rosoft.com>
Subject: Re: [PATCH v8 7/7] PCI: hv: New paravirtual PCI front-end for
 Hyper-V VMs

Hi Jake,

[auto build test WARNING on pci/next]
[also build test WARNING on v4.4-rc4 next-20151209]

url:    https://github.com/0day-ci/linux/commits/jakeo-microsoft-com/PCI-hv-New-paravirtual-PCI-front-end-for-Hyper-V-VMs/20151210-035122
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: i386-allmodconfig (attached as .config)
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   drivers/pci/host/hv_pcifront.c: In function 'prepopulate_bars':
   drivers/pci/host/hv_pcifront.c:1094:23: warning: right shift count >= width of type [-Wshift-count-overflow]
          (u32)(high_base >> 32));
                          ^
   drivers/pci/host/hv_pcifront.c: In function 'hv_pci_onchannelcallback':
   drivers/pci/host/hv_pcifront.c:1627:18: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast]
       comp_packet = (struct pci_packet *)req_id;
                     ^
   In file included from include/linux/printk.h:6:0,
                    from include/linux/kernel.h:13,
                    from drivers/pci/host/hv_pcifront.c:21:
   drivers/pci/host/hv_pcifront.c: In function 'hv_pci_allocate_bridge_windows':
>> include/linux/kern_levels.h:4:18: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 2 has type 'resource_size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/kern_levels.h:10:18: note: in expansion of macro 'KERN_SOH'
    #define KERN_ERR KERN_SOH "3" /* error conditions */
                     ^
   include/linux/printk.h:252:9: note: in expansion of macro 'KERN_ERR'
     printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
            ^
>> drivers/pci/host/hv_pcifront.c:1785:4: note: in expansion of macro 'pr_err'
       pr_err("Need %llx of low MMIO space. "
       ^
   drivers/pci/host/hv_pcifront.c:1800:8: warning: large integer implicitly truncated to unsigned type [-Woverflow]
           0x100000000, -1,
           ^
   In file included from include/linux/printk.h:6:0,
                    from include/linux/kernel.h:13,
                    from drivers/pci/host/hv_pcifront.c:21:
>> include/linux/kern_levels.h:4:18: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 2 has type 'resource_size_t {aka unsigned int}' [-Wformat=]
    #define KERN_SOH "\001"  /* ASCII Start Of Header */
                     ^
   include/linux/kern_levels.h:10:18: note: in expansion of macro 'KERN_SOH'
    #define KERN_ERR KERN_SOH "3" /* error conditions */
                     ^
   include/linux/printk.h:252:9: note: in expansion of macro 'KERN_ERR'
     printk(KERN_ERR pr_fmt(fmt), ##__VA_ARGS__)
            ^
   drivers/pci/host/hv_pcifront.c:1804:4: note: in expansion of macro 'pr_err'
       pr_err("Need %llx of high MMIO space. "
       ^

vim +/pr_err +1785 drivers/pci/host/hv_pcifront.c

  1769	 * @hbus:	Root PCI bus, as understood by this driver
  1770	 *
  1771	 * Return: 0 on success, -errno on failure
  1772	 */
  1773	static int hv_pci_allocate_bridge_windows(struct hv_pcibus_device *hbus)
  1774	{
  1775		resource_size_t align;
  1776		int ret;
  1777	
  1778		if (hbus->low_mmio_space) {
  1779			align = 1ULL << (63 - __builtin_clzll(hbus->low_mmio_space));
  1780			ret = vmbus_allocate_mmio(&hbus->low_mmio_res, hbus->hdev, 0,
  1781						  (u64)(u32)0xffffffff,
  1782						  hbus->low_mmio_space,
  1783						  align, false);
  1784			if (ret) {
> 1785				pr_err("Need %llx of low MMIO space. "
  1786					"Consider reconfiguring the VM.\n",
  1787					hbus->low_mmio_space);
  1788				return ret;
  1789			}
  1790	
  1791			hbus->low_mmio_res->flags |= IORESOURCE_WINDOW;
  1792			hbus->low_mmio_res->flags &= ~IORESOURCE_BUSY;
  1793			pci_add_resource(&hbus->resources_for_children,

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