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SubjectRe: [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)

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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