linux-kernel - Re: [PATCH v6 3/3] PCI: Add PTM clock granularity information

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Date:	Tue, 14 Jun 2016 03:42:37 +0800
From:	kbuild test robot <lkp@...el.com>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	kbuild-all@...org, Jonathan Yong <jonathan.yong@...el.com>,
	linux-pci@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/3] PCI: Add PTM clock granularity information

Hi,

[auto build test WARNING on pci/next]
[also build test WARNING on v4.7-rc3 next-20160609]
[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/Bjorn-Helgaas/PCI-Precision-Time-Measurement-support/20160614-031902
base:   https://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci.git next
config: i386-defconfig (attached as .config)
compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

Note: it may well be a FALSE warning. FWIW you are at least aware of it now.
http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings

All warnings (new ones prefixed by >>):

   drivers/pci/pcie/ptm.c: In function 'pci_enable_ptm':
>> drivers/pci/pcie/ptm.c:129:28: warning: 'ups' may be used uninitialized in this function [-Wmaybe-uninitialized]
     dev->ptm_granularity = ups->ptm_granularity;
                            ~~~^~~~~~~~~~~~~~~~~

vim +/ups +129 drivers/pci/pcie/ptm.c

   113		 * For Root Complex Integrated Endpoints, there is no upstream
   114		 * device, so there must be some implementation-specific way to
   115		 * associate the endpoint with a time source.
   116		 */
   117		if (pci_pcie_type(dev) == PCI_EXP_TYPE_ENDPOINT) {
   118			/* PTM is only useful if an upstream device has it enabled */
   119			ups = pci_upstream_bridge(dev);
   120			if (!ups || !ups->ptm_enabled)
   121				return -EINVAL;
   122		} else if (pci_pcie_type(dev) != PCI_EXP_TYPE_RC_END)
   123			return -EINVAL;
   124	
   125		pci_read_config_dword(dev, pos + PCI_PTM_CAP, &cap);
   126		if (!(cap & PCI_PTM_CAP_REQ))
   127			return -EINVAL;
   128	
 > 129		dev->ptm_granularity = ups->ptm_granularity;
   130	
   131		ctrl = PCI_PTM_CTRL_ENABLE;
   132		pci_write_config_dword(dev, pos + PCI_PTM_CTRL, ctrl);
   133		dev->ptm_enabled = 1;
   134	
   135		pci_ptm_info(dev);
   136	
   137		if (granularity)

---
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