[BLOCK] Move sector_div() from blkdev.h to kernel.h

We need it even if CONFIG_BLOCK is disabled, so move it outside of
the block layer include system.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

include/linux/blkdev.h

@@ -20,20 +20,6 @@
 
 #include <asm/scatterlist.h>
 
-#ifdef CONFIG_LBD
-# include <asm/div64.h>
-# define sector_div(a, b) do_div(a, b)
-#else
-# define sector_div(n, b)( \
-{ \
-	int _res; \
-	_res = (n) % (b); \
-	(n) /= (b); \
-	_res; \
-} \
-)
-#endif
-
 struct scsi_ioctl_command;
 
 struct request_queue;

include/linux/kernel.h

@@ -42,6 +42,20 @@ extern const char linux_proc_banner[];
 #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d))
 #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y))
 
+#ifdef CONFIG_LBD
+# include <asm/div64.h>
+# define sector_div(a, b) do_div(a, b)
+#else
+# define sector_div(n, b)( \
+{ \
+	int _res; \
+	_res = (n) % (b); \
+	(n) /= (b); \
+	_res; \
+} \
+)
+#endif
+
 /**
  * upper_32_bits - return bits 32-63 of a number
  * @n: the number we're accessing