Author: hselasky
Date: Tue Jun  5 15:37:28 2018
New Revision: 334660
URL: https://svnweb.freebsd.org/changeset/base/334660

Log:
  Add "access" function pointer to the "vm_operations_struct" structure
  in the LinuxKPI. While at it document when to use the "virtual_address" or
  the "address" field in the "vm_fault" structure.
  
  Submitted by: Johannes Lundberg <johal...@gmail.com>
  MFC after:    1 week
  Sponsored by: Mellanox Technologies
  Sponsored by: Limelight Networks

Modified:
  head/sys/compat/linuxkpi/common/include/linux/mm.h

Modified: head/sys/compat/linuxkpi/common/include/linux/mm.h
==============================================================================
--- head/sys/compat/linuxkpi/common/include/linux/mm.h  Tue Jun  5 15:30:36 
2018        (r334659)
+++ head/sys/compat/linuxkpi/common/include/linux/mm.h  Tue Jun  5 15:37:28 
2018        (r334660)
@@ -120,8 +120,8 @@ struct vm_fault {
        pgoff_t pgoff;
        union {
                /* user-space address */
-               void *virtual_address;
-               unsigned long address;
+               void *virtual_address;  /* < 4.11 */
+               unsigned long address;  /* >= 4.11 */
        };
        struct page *page;
        struct vm_area_struct *vma;
@@ -131,6 +131,7 @@ struct vm_operations_struct {
        void    (*open) (struct vm_area_struct *);
        void    (*close) (struct vm_area_struct *);
        int     (*fault) (struct vm_area_struct *, struct vm_fault *);
+       int     (*access) (struct vm_area_struct *, unsigned long, void *, int, 
int);
 };
 
 /*
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