1 files changed, 17 insertions, 0 deletions
diff --git a/linux-core/drm_fops.c b/linux-core/drm_fops.c
index 54cebbcb..ca4f9c89 100644
--- a/linux-core/drm_fops.c
+++ b/linux-core/drm_fops.c
@@ -191,6 +191,23 @@ int drm_stub_open(struct inode *inode, struct file *filp)
 }
 
 /**
+ * Check whether DRI will run on this CPU.
+ *
+ * \return non-zero if the DRI will run on this CPU, or zero otherwise.
+ */
+static int drm_cpu_valid(void)
+{
+#if defined(__i386__)
+	if (boot_cpu_data.x86 == 3)
+		return 0;	/* No cmpxchg on a 386 */
+#endif
+#if defined(__sparc__) && !defined(__sparc_v9__)
+	return 0;		/* No cmpxchg before v9 sparc. */
+#endif
+	return 1;
+}
+
+/**
  * Called whenever a process opens /dev/drm.
  *
  * \param inode device inode.