[PATCH] clocksource: replace is_continuous by a flag field

Using a flag filed allows to encode more than one information into a variable.
Preparatory patch for the generic clocksource verification.

[mingo@elte.hu: convert vmitime.c to the new clocksource flag]
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: john stultz <johnstul@us.ibm.com>
Cc: Roman Zippel <zippel@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

9 files changed, 20 insertions, 11 deletions

diff --git a/arch/i386/kernel/hpet.c b/arch/i386/kernel/hpet.c
index 0b29d41322a2..7d2739fff3a3 100644
--- a/arch/i386/kernel/hpet.c
+++ b/arch/i386/kernel/hpet.c
@@ -26,7 +26,7 @@ static struct clocksource clocksource_hpet = {
         .mask           = HPET_MASK,
         .mult           = 0, /* set below */
         .shift          = HPET_SHIFT,
-        .is_continuous  = 1,
+        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
 static int __init init_hpet_clocksource(void)
diff --git a/arch/i386/kernel/tsc.c b/arch/i386/kernel/tsc.c
index 0fd93107ff9a..a37654991788 100644
--- a/arch/i386/kernel/tsc.c
+++ b/arch/i386/kernel/tsc.c
@@ -314,7 +314,8 @@ static struct clocksource clocksource_tsc = {
         .mult                   = 0, /* to be set */
         .shift                  = 22,
         .update_callback        = tsc_update_callback,
-        .is_continuous          = 1,
+        .flags                  = CLOCK_SOURCE_IS_CONTINUOUS |
+                                  CLOCK_SOURCE_MUST_VERIFY,
 };
 
 static int tsc_update_callback(void)
@@ -434,8 +435,10 @@ static int __init init_tsc_clocksource(void)
                 clocksource_tsc.mult = clocksource_khz2mult(current_tsc_khz,
                                                         clocksource_tsc.shift);
                 /* lower the rating if we already know its unstable: */
-                if (check_tsc_unstable())
+                if (check_tsc_unstable()) {
                         clocksource_tsc.rating = 0;
+                        clocksource_tsc.flags &= ~CLOCK_SOURCE_IS_CONTINUOUS;
+                }
 
                 init_timer(&verify_tsc_freq_timer);
                 verify_tsc_freq_timer.function = verify_tsc_freq;
diff --git a/arch/i386/kernel/vmitime.c b/arch/i386/kernel/vmitime.c
index 2e2d8dbcbd68..76d2adcae5a3 100644
--- a/arch/i386/kernel/vmitime.c
+++ b/arch/i386/kernel/vmitime.c
@@ -115,7 +115,7 @@ static struct clocksource clocksource_vmi = {
         .mask                   = CLOCKSOURCE_MASK(64),
         .mult                   = 0, /* to be set */
         .shift                  = 22,
-        .is_continuous          = 1,
+        .flags                  = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
 
diff --git a/drivers/clocksource/acpi_pm.c b/drivers/clocksource/acpi_pm.c
index b6bcdbbf57b3..c7276a61695b 100644
--- a/drivers/clocksource/acpi_pm.c
+++ b/drivers/clocksource/acpi_pm.c
@@ -72,7 +72,8 @@ static struct clocksource clocksource_acpi_pm = {
         .mask           = (cycle_t)ACPI_PM_MASK,
         .mult           = 0, /*to be caluclated*/
         .shift          = 22,
-        .is_continuous  = 1,
+        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
+
 };
 
 
diff --git a/drivers/clocksource/cyclone.c b/drivers/clocksource/cyclone.c
index bf4d3d50d1c4..4f3925ceb360 100644
--- a/drivers/clocksource/cyclone.c
+++ b/drivers/clocksource/cyclone.c
@@ -31,7 +31,7 @@ static struct clocksource clocksource_cyclone = {
         .mask           = CYCLONE_TIMER_MASK,
         .mult           = 10,
         .shift          = 0,
-        .is_continuous  = 1,
+        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
 static int __init init_cyclone_clocksource(void)
diff --git a/drivers/clocksource/scx200_hrt.c b/drivers/clocksource/scx200_hrt.c
index 22915cc46ba7..b92da677aa5d 100644
--- a/drivers/clocksource/scx200_hrt.c
+++ b/drivers/clocksource/scx200_hrt.c
@@ -57,7 +57,7 @@ static struct clocksource cs_hrt = {
         .rating         = 250,
         .read           = read_hrt,
         .mask           = CLOCKSOURCE_MASK(32),
-        .is_continuous  = 1,
+        .flags          = CLOCK_SOURCE_IS_CONTINUOUS,
         /* mult, shift are set based on mhz27 flag */
 };
 
diff --git a/include/linux/clocksource.h b/include/linux/clocksource.h
index 55d714052374..45b0c310ae82 100644
--- a/include/linux/clocksource.h
+++ b/include/linux/clocksource.h
@@ -45,7 +45,7 @@ typedef u64 cycle_t;
  * @mult:               cycle to nanosecond multiplier
  * @shift:              cycle to nanosecond divisor (power of two)
  * @update_callback:    called when safe to alter clocksource values
- * @is_continuous:      defines if clocksource is free-running.
+ * @flags:              flags describing special properties
  * @cycle_interval:     Used internally by timekeeping core, please ignore.
  * @xtime_interval:     Used internally by timekeeping core, please ignore.
  */
@@ -58,7 +58,7 @@ struct clocksource {
         u32 mult;
         u32 shift;
         int (*update_callback)(void);
-        int is_continuous;
+        unsigned long flags;
 
         /* timekeeping specific data, ignore */
         cycle_t cycle_last, cycle_interval;
@@ -66,6 +66,12 @@ struct clocksource {
         s64 error;
 };
 
+/*
+ * Clock source flags bits::
+ */
+#define CLOCK_SOURCE_IS_CONTINUOUS      0x01
+#define CLOCK_SOURCE_MUST_VERIFY        0x02
+
 /* simplify initialization of mask field */
 #define CLOCKSOURCE_MASK(bits) (cycle_t)(bits<64 ? ((1ULL<<bits)-1) : -1)
 
diff --git a/kernel/time/jiffies.c b/kernel/time/jiffies.c
index a99b2a6e6a07..3be8da8fed7e 100644
--- a/kernel/time/jiffies.c
+++ b/kernel/time/jiffies.c
@@ -62,7 +62,6 @@ struct clocksource clocksource_jiffies = {
         .mask           = 0xffffffff, /*32bits*/
         .mult           = NSEC_PER_JIFFY << JIFFIES_SHIFT, /* details above */
         .shift          = JIFFIES_SHIFT,
-        .is_continuous  = 0, /* tick based, not free running */
 };
 
 static int __init init_jiffies_clocksource(void)
diff --git a/kernel/timer.c b/kernel/timer.c
index 8f4bf1e6a3ed..1144ff2c2ea3 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -871,7 +871,7 @@ int timekeeping_is_continuous(void)
         do {
                 seq = read_seqbegin(&xtime_lock);
 
-                ret = clock->is_continuous;
+                ret = clock->flags & CLOCK_SOURCE_IS_CONTINUOUS;
 
         } while (read_seqretry(&xtime_lock, seq));