John Baldwin e23cd1b923 Initialize vm_page_prot to VM_MEMATTR_DEFAULT instead of 0. ... If a driver's Linux mmap callback passed vm_page_prot through unchanged, then linux_dev_mmap_single() would try to apply whatever VM_MEMATTR_xxx value 0 is to the mapping. On x86, VM_MEMATTR_DEFAULT is the PAT value for write-back (WB) which is 6, while 0 maps to the PAT value for uncacheable (UC). Thus, any mmap request that did not explicitly set page_prot was tried to map memory as UC triggering the warning in sg_pager_getpages(). Tested by: np Reported by: Krishnamraju Eraparaju @ Chelsio MFC after: 3 days Sponsored by: Chelsio Communications		2016-01-20 00:14:34 +00:00
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common	Initialize vm_page_prot to VM_MEMATTR_DEFAULT instead of 0.	2016-01-20 00:14:34 +00:00