gentoo-overlay/x11-drivers/ati-drivers/files/15.9-mtrr.patch

--- a/common/lib/modules/fglrx/build_mod/firegl_public.c	2015-09-19 23:43:22.000000000 -0400
+++ b/common/lib/modules/fglrx/build_mod/firegl_public.c	2015-09-19 23:52:07.000000000 -0400
@@ -3442,7 +3442,11 @@ int ATI_API_CALL KCL_MEM_MTRR_Support(vo
 int ATI_API_CALL KCL_MEM_MTRR_AddRegionWc(unsigned long base, unsigned long size)
 {
 #ifdef CONFIG_MTRR
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)
+    return arch_phys_wc_add(base, size);
+#else
     return mtrr_add(base, size, MTRR_TYPE_WRCOMB, 1);
+#endif
 #else /* !CONFIG_MTRR */
     return -EPERM;
 #endif /* !CONFIG_MTRR */
@@ -3451,7 +3455,12 @@ int ATI_API_CALL KCL_MEM_MTRR_AddRegionW
 int ATI_API_CALL KCL_MEM_MTRR_DeleteRegion(int reg, unsigned long base, unsigned long size)
 {
 #ifdef CONFIG_MTRR
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4,3,0)
+    arch_phys_wc_del(reg);
+    return reg;
+#else
     return mtrr_del(reg, base, size);
+#endif
 #else /* !CONFIG_MTRR */
     return -EPERM;
 #endif /* !CONFIG_MTRR */