headers: smp_lock.h redux

* Remove smp_lock.h from files which don't need it (including some headers!)
* Add smp_lock.h to files which do need it
* Make smp_lock.h include conditional in hardirq.h
  It's needed only for one kernel_locked() usage which is under CONFIG_PREEMPT

  This will make hardirq.h inclusion cheaper for every PREEMPT=n config
  (which includes allmodconfig/allyesconfig, BTW)

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/drivers/char/n_hdlc.c b/drivers/char/n_hdlc.c
index 1c43c8cdee25..c68118efad84 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>