[PATCH] s390: fix ipd handling

As pointed out by Paulo Marques <[e-mail]> MAX_IPD_TIME is by
a factor of ten too small. Since this means that we allow ten times more
IPDs in the intended time frame this could result in a cpu check stop of a
physical cpu.

Cc: Martin Schwidefsky <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/s390/s390mach.c

···
 #include <linux/sched.h>
 #include <linux/errno.h>
 #include <linux/workqueue.h>
+#include <linux/time.h>
 
 #include <asm/lowcore.h>
 
···
 }
 
 #define MAX_IPD_COUNT	29
-#define MAX_IPD_TIME	(5 * 60 * 100 * 1000) /* 5 minutes */
+#define MAX_IPD_TIME	(5 * 60 * USEC_PER_SEC) /* 5 minutes */
 
 /*
  * machine check handler.