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authorThomas Gleixner <tglx@linutronix.de>2007-02-16 12:27:36 +0300
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-16 19:13:57 +0300
commit73b08d2aa4245806ef1bdd48463e9a0b045c62cf (patch)
tree1cd5b3a7b9f889bb6ff1e7fc6c9a95751faad4d7
parent95492e4646e5de8b43d9a7908d6177fb737b61f0 (diff)
downloadlinux-73b08d2aa4245806ef1bdd48463e9a0b045c62cf.tar.xz
[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>
-rw-r--r--arch/i386/kernel/hpet.c2
-rw-r--r--arch/i386/kernel/tsc.c7
-rw-r--r--arch/i386/kernel/vmitime.c2
-rw-r--r--drivers/clocksource/acpi_pm.c3
-rw-r--r--drivers/clocksource/cyclone.c2
-rw-r--r--drivers/clocksource/scx200_hrt.c2
-rw-r--r--include/linux/clocksource.h10
-rw-r--r--kernel/time/jiffies.c1
-rw-r--r--kernel/timer.c2
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));