nvidia-drivers adopted for 4.0+ kernels.

x11-drivers/nvidia-drivers/files/4.0_kernel.patch

@@ -0,0 +1,12 @@
+--- kernel/nv-linux.h	2015-06-26 15:17:49.851273250 +0300
++++ kernel/nv-linux.h	2015-06-26 15:22:51.119150159 +0300
+@@ -1864,4 +1864,9 @@
+ #define f_dentry f_path.dentry
+ #endif
+ 
++#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 0, 0)
++#define read_cr4 __read_cr4
++#define write_cr4 __write_cr4
++#endif
++
+ #endif  /* _NV_LINUX_H_ */

x11-drivers/nvidia-drivers/nvidia-drivers-331.113.ebuild

@@ -180,6 +180,10 @@ src_prepare() {
 			epatch "${FILESDIR}"/3.19_kernel.patch
 		fi
 
+		if kernel_is gt 4 0 0 ; then
+			epatch "${FILESDIR}"/4.0_kernel.patch
+		fi
+
 		# If greater than 2.6.5 use M= instead of SUBDIR=
 #		convert_to_m "${NV_SRC}"/Makefile.kbuild
 	fi