1 files changed, 17 insertions, 0 deletions

diff --git a/drivers/char/drm/drm_fops.c b/drivers/char/drm/drm_fops.c
index f57f7d1a281e..28f01305377f 100644
--- a/drivers/char/drm/drm_fops.c
+++ b/drivers/char/drm/drm_fops.c
@@ -322,6 +322,23 @@ int drm_release(struct inode *inode, struct file *filp)
 EXPORT_SYMBOL(drm_release);
 
 /**
+ * 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.