From a92e1d1a8d9a4dcaff3c6dc3d6b47d4b2e341155 Mon Sep 17 00:00:00 2001
From: "Suren A. Chilingaryan" <csa@suren.me>
Date: Wed, 14 Jun 2017 03:33:43 +0200
Subject: Support kernels up to 4.9 (patch provided by Timo)

---
 driver/compat.h |  9 +++++++++
 driver/umem.c   | 22 +++++++---------------
 2 files changed, 16 insertions(+), 15 deletions(-)

diff --git a/driver/compat.h b/driver/compat.h
index 24cc5a9..ba9d15a 100644
--- a/driver/compat.h
+++ b/driver/compat.h
@@ -37,4 +37,13 @@
 # define __devinitdata
 #endif
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,9,0)
+# define get_user_pages_compat(vma, nr, pages) get_user_pages(vma, nr, FOLL_WRITE, pages, NULL)
+#elif LINUX_VERSION_CODE >= KERNEL_VERSION(4,6,0)
+# define get_user_pages_compat(vma, nr, pages) get_user_pages(vma, nr, 1, 0, pages, NULL)
+#else
+# define get_user_pages_compat(vma, nr, pages) get_user_pages(current, current->mm, vma, nr, 1, 0, pages, NULL)
+#endif
+
+
 #endif
diff --git a/driver/umem.c b/driver/umem.c
index 8d73207..e643102 100644
--- a/driver/umem.c
+++ b/driver/umem.c
@@ -81,15 +81,7 @@ int pcidriver_umem_sgmap(pcidriver_privdata_t *privdata, umem_handle_t *umem_han
 
     /* Get the page information */
     down_read(&current->mm->mmap_sem);
-    res = get_user_pages(
-              current,
-              current->mm,
-              umem_handle->vma,
-              nr_pages,
-              1,
-              0,  /* do not force, FIXME: shall I? */
-              pages,
-              NULL );
+    res = get_user_pages_compat(umem_handle->vma, nr_pages, pages);
     up_read(&current->mm->mmap_sem);
 
     /* Error, not all pages mapped */
@@ -106,7 +98,7 @@ int pcidriver_umem_sgmap(pcidriver_privdata_t *privdata, umem_handle_t *umem_han
     /* Lock the pages, then populate the SG list with the pages */
     /* page0 is different */
     if ( !PageReserved(pages[0]) )
-        __set_page_locked(pages[0]);
+        lock_page(pages[0]);
 
     offset = (umem_handle->vma & ~PAGE_MASK);
     length = (umem_handle->size > (PAGE_SIZE-offset) ? (PAGE_SIZE-offset) : umem_handle->size);
@@ -117,7 +109,7 @@ int pcidriver_umem_sgmap(pcidriver_privdata_t *privdata, umem_handle_t *umem_han
     for(i=1; i<nr_pages; i++) {
         /* Lock page first */
         if ( !PageReserved(pages[i]) )
-            __set_page_locked(pages[i]);
+            lock_page(pages[i]);
 
         /* Populate the list */
         sg_set_page(&sg[i], pages[i], ((count > PAGE_SIZE) ? PAGE_SIZE : count), 0);
@@ -166,10 +158,10 @@ umem_sgmap_unmap:
     if (nr_pages > 0) {
         for(i=0; i<nr_pages; i++) {
             if (PageLocked(pages[i]))
-                __clear_page_locked(pages[i]);
+                unlock_page(pages[i]);
             if (!PageReserved(pages[i]))
                 set_page_dirty(pages[i]);
-            page_cache_release(pages[i]);
+            put_page(pages[i]);
         }
     }
     vfree(sg);
@@ -198,10 +190,10 @@ int pcidriver_umem_sgunmap(pcidriver_privdata_t *privdata, pcidriver_umem_entry_
             /* Mark pages as Dirty and unlock it */
             if ( !PageReserved( umem_entry->pages[i] )) {
                 SetPageDirty( umem_entry->pages[i] );
-                __clear_page_locked(umem_entry->pages[i]);
+                unlock_page(umem_entry->pages[i]);
             }
             /* and release it from the cache */
-            page_cache_release( umem_entry->pages[i] );
+            put_page( umem_entry->pages[i] );
         }
     }
 
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