Author: jhb
Date: Sat Jan 23 17:08:17 2016
New Revision: 294636
URL: https://svnweb.freebsd.org/changeset/base/294636
Log:
MFC 294366:
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().
Sponsored by: Chelsio Communications
Modified:
stable/9/sys/ofed/include/linux/linux_compat.c
Directory Properties:
stable/9/sys/ (props changed)
Changes in other areas also in this revision:
Modified:
stable/10/sys/ofed/include/linux/linux_compat.c
Directory Properties:
stable/10/ (props changed)
Modified: stable/9/sys/ofed/include/linux/linux_compat.c
==============================================================================
--- stable/9/sys/ofed/include/linux/linux_compat.c Sat Jan 23 15:48:14
2016 (r294635)
+++ stable/9/sys/ofed/include/linux/linux_compat.c Sat Jan 23 17:08:17
2016 (r294636)
@@ -434,7 +434,7 @@ linux_dev_mmap_single(struct cdev *dev,
vma.vm_end = size;
vma.vm_pgoff = *offset / PAGE_SIZE;
vma.vm_pfn = 0;
- vma.vm_page_prot = 0;
+ vma.vm_page_prot = VM_MEMATTR_DEFAULT;
if (filp->f_op->mmap) {
error = -filp->f_op->mmap(filp, &vma);
if (error == 0) {
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