[PATCH] s390: hangcheck timer support

Remove useless s390 define from hangcheck-timer, remove wrong definition of a
TOD second and other s390 ifdefs.  Use monotonic_clock instead.

Add hangcheck-timer option, copied from drivers/char/Kconfig.  This is ugly
but unless we have a big Kconfig cleanup we cannot include
drivers/char/Kconfig...

Signed-off-by: Jan Glauber <jan.glauber@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/Kconfig

@@ -992,7 +992,7 @@ config HPET_MMAP
 
 config HANGCHECK_TIMER
 	tristate "Hangcheck timer"
-	depends on X86 || IA64 || PPC64 || S390
+	depends on X86 || IA64 || PPC64
 	help
 	  The hangcheck-timer module detects when the system has gone
 	  out to lunch past a certain margin.  It can reboot the system

drivers/char/hangcheck-timer.c

@@ -117,12 +117,9 @@ __setup("hcheck_reboot", hangcheck_parse_reboot);
 __setup("hcheck_dump_tasks", hangcheck_parse_dump_tasks);
 #endif /* not MODULE */
 
-#if defined(CONFIG_X86)
+#if defined(CONFIG_X86) || defined(CONFIG_S390)
 # define HAVE_MONOTONIC
 # define TIMER_FREQ 1000000000ULL
-#elif defined(CONFIG_S390)
-/* FA240000 is 1 Second in the IBM time universe (Page 4-38 Principles of Op for zSeries */
-# define TIMER_FREQ 0xFA240000ULL
 #elif defined(CONFIG_IA64)
 # define TIMER_FREQ ((unsigned long long)local_cpu_data->itc_freq)
 #elif defined(CONFIG_PPC64)
@@ -134,12 +131,7 @@ extern unsigned long long monotonic_clock(void);
 #else
 static inline unsigned long long monotonic_clock(void)
 {
-# ifdef __s390__
-	/* returns the TOD.  see 4-38 Principles of Op of zSeries */
-	return get_clock();
-# else
 	return get_cycles();
-# endif  /* __s390__ */
 }
 #endif  /* HAVE_MONOTONIC */
 
@@ -188,8 +180,6 @@ static int __init hangcheck_init(void)
 	       VERSION_STR, hangcheck_tick, hangcheck_margin);
 #if defined (HAVE_MONOTONIC)
 	printk("Hangcheck: Using monotonic_clock().\n");
-#elif defined(__s390__)
-	printk("Hangcheck: Using TOD.\n");
 #else
 	printk("Hangcheck: Using get_cycles().\n");
 #endif  /* HAVE_MONOTONIC */

drivers/s390/Kconfig

@@ -51,6 +51,13 @@ config UNIX98_PTY_COUNT
 	  When not in use, each additional set of 256 PTYs occupy
 	  approximately 8 KB of kernel memory on 32-bit architectures.
 
+config HANGCHECK_TIMER
+	tristate "Hangcheck timer"
+	help
+	  The hangcheck-timer module detects when the system has gone
+	  out to lunch past a certain margin.  It can reboot the system
+	  or merely print a warning.
+
 source "drivers/char/watchdog/Kconfig"
 
 comment "S/390 character device drivers"