drivers/bus/pci/linux/pci_vfio.c does not compile when compilation strictly fails on warnings

https://dpdk.org/tracker/show_bug.cgi?id=36

Bug ID: 36
Summary: drivers/bus/pci/linux/pci_vfio.c does not compile when
compilation strictly fails on warnings
Product: DPDK
Version: 18.05
Hardware: All
OS: All
Status: CONFIRMED
Severity: minor
Priority: Normal
Component: ethdev
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---

This file produces a warning: `dpdk/drivers/bus/pci/linux/pci_vfio.c:38:0:
warning: "PAGE_SIZE" redefined`.

This is irritatingly when one is compiling with warnings as errors in order to catch more serious bugs (eg implicit function definitions). One potential fix might be to do:-

```
#undef PAGE_SIZE
#define PAGE_SIZE   (sysconf(_SC_PAGESIZE))
```

But as I'm not clear on the implications, I can't comment further.

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