linux-kernel - Re: [PATCH] PCI: Consider alignment of hot-added bridges when distributing available resources

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Message-ID: <201902041954.1WrV5sHl%fengguang.wu@intel.com>
Date:   Mon, 4 Feb 2019 19:09:00 +0800
From:   kbuild test robot <lkp@...el.com>
To:     Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
Cc:     kbuild-all@...org,
        "mika.westerberg@...ux.intel.com" <mika.westerberg@...ux.intel.com>,
        Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PCI: Consider alignment of hot-added bridges when
 distributing available resources

Hi Nicholas,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on pci/next]
[also build test WARNING on v5.0-rc4 next-20190204]
[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/Nicholas-Johnson/PCI-Consider-alignment-of-hot-added-bridges-when-distributing-available-resources/20190204-182638
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: i386-randconfig-x007-201905 (attached as .config)
compiler: gcc-8 (Debian 8.2.0-14) 8.2.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All warnings (new ones prefixed by >>):

   In file included from include/linux/printk.h:331,
                    from include/linux/kernel.h:14,
                    from drivers//pci/setup-bus.c:18:
   drivers//pci/setup-bus.c: In function 'extend_bridge_window':
>> drivers//pci/setup-bus.c:1831:18: warning: format '%llx' expects argument of type 'long long unsigned int', but argument 5 has type 'resource_size_t' {aka 'unsigned int'} [-Wformat=]
     pci_dbg(bridge, "bridge window %pR extended by 0x%016llx\n", res,
                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   include/linux/dynamic_debug.h:135:39: note: in definition of macro 'dynamic_dev_dbg'
      __dynamic_dev_dbg(&descriptor, dev, fmt, \
                                          ^~~
   include/linux/device.h:1473:23: note: in expansion of macro 'dev_fmt'
     dynamic_dev_dbg(dev, dev_fmt(fmt), ##__VA_ARGS__)
                          ^~~~~~~
   include/linux/pci.h:2362:36: note: in expansion of macro 'dev_dbg'
    #define pci_dbg(pdev, fmt, arg...) dev_dbg(&(pdev)->dev, fmt, ##arg)
                                       ^~~~~~~
   drivers//pci/setup-bus.c:1831:2: note: in expansion of macro 'pci_dbg'
     pci_dbg(bridge, "bridge window %pR extended by 0x%016llx\n", res,
     ^~~~~~~

vim +1831 drivers//pci/setup-bus.c

  1816	
  1817	static void extend_bridge_window(struct pci_dev *bridge, struct resource *res,
  1818				struct list_head *add_list, resource_size_t available)
  1819	{
  1820		struct pci_dev_resource *dev_res;
  1821	
  1822		if (res->parent)
  1823			return;
  1824	
  1825		/*
  1826		 * Hot-adding multiple Thunderbolt devices in SL0 might result in
  1827		 * multiple devices being enumerated together. This can break the
  1828		 * resource allocation if the resource sizes are specified with
  1829		 * add_size instead of simply changing the resource size.
  1830		*/
> 1831		pci_dbg(bridge, "bridge window %pR extended by 0x%016llx\n", res,
  1832			available - resource_size(res));
  1833		res->end = res->start + available - 1;
  1834	
  1835		/*
  1836		 * If a list entry exists, we need to remove any additional size
  1837		 * requested because that could interfere with the alignment and
  1838		 * sizing done when distributing resources, causing resources to
  1839		 * fail to allocate later on.
  1840		 */
  1841		dev_res = res_to_dev_res(add_list, res);
  1842		if (!dev_res)
  1843			return;
  1844	
  1845		dev_res->add_size = 0;
  1846	}
  1847	

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