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Quick patch for OpenSUSE Leap 42.3 using get_user_pages() API from kernel 4.10 on kernel 4.4 (sigh):

--- src/vboxguest-5.1.26/vboxguest/r0drv/linux/memobj-r0drv-linux.c.orig   2017-07-27 13:45:39.000000000 +0200
+++ src/vboxguest-5.1.26/vboxguest/r0drv/linux/memobj-r0drv-linux.c        2017-07-28 00:07:05.225700000 +0200
@@ -1101,18 +1101,14 @@
 # endif
                                 );
 #else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0) */
-            rc = get_user_pages(pTask,                  /* Task for fault accounting. */
-                                pTask->mm,              /* Whose pages. */
-                                R3Ptr,                  /* Where from. */
+           /* The following is modified for Leap 42.3 having the
+            *  get_user_pages() API from kernel 4.10
+            */
+            rc = get_user_pages(R3Ptr,                  /* Where from. */
                                 cPages,                 /* How many pages. */
-# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)
                                 fWrite ? FOLL_WRITE |   /* Write to memory. */
                                          FOLL_FORCE     /* force write access. */
                                        : 0,             /* Write to memory. */
-# else
-                                fWrite,                 /* Write to memory. */
-                                fWrite,                 /* force write access. */
-# endif
                                 &pMemLnx->apPages[0],   /* Page array. */
                                 papVMAs);               /* vmas */
 #endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0) */

Proposed for upstream (VirtualBox):

<...>
# if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 10, 0)
                                , NULL                  /* locked */
# endif
                                );
#else /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0) */
 
# if LEAP_VERSION == (4, 2, 3)
            rc = get_user_pages(R3Ptr,  
#else
            rc = get_user_pages(pTask,                  /* Task for fault accounting. */
                                pTask->mm,              /* Whose pages. */
                                R3Ptr,                  /* Where from. */
                                cPages,                 /* How many pages. */
# endif
# if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0)) && (LEAP_VERSION == (4, 2, 3))
                                fWrite ? FOLL_WRITE |   /* Write to memory. */
                                         FOLL_FORCE     /* force write access. */
                                       : 0,             /* Write to memory. */
# if LEAP_VERSION != (4, 2, 3)
                                fWrite,                 /* Write to memory. */
                                fWrite,                 /* force write access. */
# endif
                                &pMemLnx->apPages[0],   /* Page array. */
                                papVMAs);               /* vmas */
#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 6, 0) */
<...>