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[PATCH] generic-time: add macro to simplify/hide mask constants

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Add a CLOCKSOURCE_MASK macro to simplify initializing the mask for a struct
clocksource, and use it to replace literal mask constants in the various
clocksource drivers.

Signed-off-by: Jim Cromie <jim.cromie@gmail.com>
Acked-by: John Stultz <johnstul@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Jim Cromie 2006-06-26 00:25:15 -07:00 committed by Linus Torvalds
parent 7d622d4794
commit 7f9f303aa3
6 changed files with 9 additions and 7 deletions
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4
arch/i386/kernel/hpet.c
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@ -6,7 +6,7 @@
#include <asm/hpet.h>
#include <asm/io.h>
#define HPET_MASK 0xFFFFFFFF
#define HPET_MASK CLOCKSOURCE_MASK(32)
#define HPET_SHIFT 22
/* FSEC = 10^-15 NSEC = 10^-9 */
@ -23,7 +23,7 @@ static struct clocksource clocksource_hpet = {
.name = "hpet",
.rating = 250,
.read = read_hpet,
.mask = (cycle_t)HPET_MASK,
.mask = HPET_MASK,
.mult = 0, /* set below */
.shift = HPET_SHIFT,
.is_continuous = 1,

2
arch/i386/kernel/i8253.c
View File

@ -69,7 +69,7 @@ static struct clocksource clocksource_pit = {
.name = "pit",
.rating = 110,
.read = pit_read,
.mask = (cycle_t)-1,
.mask = CLOCKSOURCE_MASK(64),
.mult = 0,
.shift = 20,
};

2
arch/i386/kernel/tsc.c
View File

@ -337,7 +337,7 @@ static struct clocksource clocksource_tsc = {
.name = "tsc",
.rating = 300,
.read = read_tsc,
.mask = (cycle_t)-1,
.mask = CLOCKSOURCE_MASK(64),
.mult = 0, /* to be set */
.shift = 22,
.update_callback = tsc_update_callback,

2
drivers/clocksource/acpi_pm.c
View File

@ -32,7 +32,7 @@
*/
u32 pmtmr_ioport __read_mostly;
#define ACPI_PM_MASK 0xFFFFFF /* limit it to 24 bits */
#define ACPI_PM_MASK CLOCKSOURCE_MASK(24) /* limit it to 24 bits */
static inline u32 read_pmtmr(void)
{

4
drivers/clocksource/cyclone.c
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@ -14,7 +14,7 @@
#define CYCLONE_MPCS_OFFSET 0x51A8 /* offset to select register */
#define CYCLONE_MPMC_OFFSET 0x51D0 /* offset to count register */
#define CYCLONE_TIMER_FREQ 99780000 /* 100Mhz, but not really */
#define CYCLONE_TIMER_MASK 0xFFFFFFFF /* 32 bit mask */
#define CYCLONE_TIMER_MASK CLOCKSOURCE_MASK(32) /* 32 bit mask */
int use_cyclone = 0;
static void __iomem *cyclone_ptr;
@ -28,7 +28,7 @@ static struct clocksource clocksource_cyclone = {
.name = "cyclone",
.rating = 250,
.read = read_cyclone,
.mask = (cycle_t)CYCLONE_TIMER_MASK,
.mask = CYCLONE_TIMER_MASK,
.mult = 10,
.shift = 0,
.is_continuous = 1,

2
include/linux/clocksource.h
View File

@ -65,6 +65,8 @@ struct clocksource {
u64 interval_snsecs;
};
/* simplify initialization of mask field */
#define CLOCKSOURCE_MASK(bits) (cycle_t)(bits<64 ? ((1ULL<<bits)-1) : -1)
/**
* clocksource_khz2mult - calculates mult from khz and shift