2014-10-31 15:37, Jincheng Miao: > Function pci_num_vf() is introduced from upstream linux-2.6.34. So > this patch make compatible with longterm kernel linux-2.6.32.63. > > For RHEL6's kernel, although it is based on linux-2.6.32, it has > pci_num_vf() implementation. As the same with commit 11ba0426, > pci_num_vf() is defined from RHEL6. So we should check the macro > RHEL_RELEASE_CODE to consider this situation.
Please, could you explain in which case CONFIG_PCI_IOV is defined? The logic is a bit difficult to understand. > #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 34) && \ > - !defined(CONFIG_PCI_IOV) > + (!(defined(RHEL_RELEASE_CODE) && \ > + RHEL_RELEASE_CODE >= RHEL_RELEASE_VERSION(6, 0) && \ > + defined(CONFIG_PCI_IOV))) > > static int pci_num_vf(struct pci_dev *dev) > {