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-rw-r--r--drivers/char/n_hdlc.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/char/n_hdlc.c b/drivers/char/n_hdlc.c
index 1c43c8c..c68118e 100644
--- a/drivers/char/n_hdlc.c
+++ b/drivers/char/n_hdlc.c
@@ -97,6 +97,7 @@
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/errno.h>
+#include <linux/smp_lock.h>
#include <linux/string.h> /* used in new tty drivers */
#include <linux/signal.h> /* used in new tty drivers */
#include <linux/if.h>
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