cryptodev: fix compilation error for kernel v4.9

The patch is needed to match the API kernel changes. This fixes:

zc.c:68:44: error: passing argument 7 of 'get_user_pages_remote' from incompatible pointer type [-Werror=incompatible-pointer-types]
     (unsigned long)addr, pgcount, write, 0, pg, NULL);
                                             ^~
In file included from zc.c:28:0:
  kernel-source/include/linux/mm.h:1276:6: note: expected 'struct vm_area_struct **' but argument is of type 'struct page **'
    long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
         ^~~~~~~~~~~~~~~~~~~~~
  zc.c:63:8: error: too many arguments to function 'get_user_pages_remote'
   ret = get_user_pages_remote(
         ^~~~~~~~~~~~~~~~~~~~~
 In file included from zc.c:28:0:
 kernel-source/include/linux/mm.h:1276:6: note: declared here
   long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
        ^~~~~~~~~~~~~~~~~~~~~
 cc1: some warnings being treated as errors

https://jira.digi.com/browse/DEL-5081

Signed-off-by: Jose Diaz de Grenu <Jose.DiazdeGrenu@digi.com>

meta-digi-arm/recipes-kernel/cryptodev/cryptodev-module/0002-Adjust-to-another-change-in-the-user-page-API.patch

@@ -0,0 +1,32 @@
+From: Michael Weiser <michael.weiser@gmx.de>
+Date: Fri, 11 Nov 2016 18:09:32 +0100
+Subject: [PATCH] Adjust to another change in the user page API
+
+4.9.0 will replace the write and force flags of get_user_pages_remote()
+with a gup_flags parameter[1]. Distinguish the two APIs based on kernel
+version we're compiling for.
+
+[1] https://github.com/torvalds/linux/commit/9beae1ea89305a9667ceaab6d0bf46a045ad71e7
+---
+ zc.c | 8 +++++++-
+ 1 file changed, 7 insertions(+), 1 deletion(-)
+
+diff --git a/zc.c b/zc.c
+index a97b49f75327..e766ee3eabc7 100644
+--- a/zc.c
++++ b/zc.c
+@@ -65,7 +65,13 @@ int __get_userbuf(uint8_t __user *addr, uint32_t len, int write,
+ 	ret = get_user_pages(
+ #endif
+ 			task, mm,
+-			(unsigned long)addr, pgcount, write, 0, pg, NULL);
++			(unsigned long)addr, pgcount,
++#if (LINUX_VERSION_CODE >= KERNEL_VERSION(4, 9, 0))
++			write ? FOLL_WRITE : 0,
++#else
++			write, 0,
++#endif
++			pg, NULL);
+ 	up_read(&mm->mmap_sem);
+ 	if (ret != pgcount)
+ 		return -EINVAL;

meta-digi-arm/recipes-kernel/cryptodev/cryptodev-module_%.bbappend

@@ -1,3 +1,7 @@
-# Copyright (C) 2016 Digi International.
+# Copyright (C) 2016-2017 Digi International Inc.
+
+FILESEXTRAPATHS_prepend := "${THISDIR}/${BPN}:"
+
+SRC_URI_append = " file://0002-Adjust-to-another-change-in-the-user-page-API.patch"
 
 KERNEL_MODULE_AUTOLOAD = "cryptodev"