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Subject[patch 1/1 17-rc3-mm1] generic-time: add macro to simplify/hide mask constants
This patch compiles clean, and is running and maintaining ntp lock
(across ethernet to a laptop). I've verified (with objdump) that
macro reduces to constant at compile-time. Also compile-tested with
allnoconfig. Please consider for -mm.

---

From: Jim Cromie <jim.cromie@gmail.com>
Date: Wed May 3 10:59:00 EDT 2006


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>

---

arch/i386/kernel/hpet.c | 4 ++--

arch/i386/kernel/i8253.c | 2 +-
arch/i386/kernel/tsc.c | 2 +-
drivers/clocksource/acpi_pm.c | 2 +-
drivers/clocksource/cyclone.c | 4 ++--
include/linux/clocksource.h | 2 ++
localversion-clk | 1 + (trimmed out)
8 files changed, 10 insertions(+), 7 deletions(-)


diff -ruNp -X dontdiff -X exclude-diffs linux-2.6.17-rc3-mm1/arch/i386/kernel/hpet.c clksrc-mask/arch/i386/kernel/hpet.c
--- linux-2.6.17-rc3-mm1/arch/i386/kernel/hpet.c 2006-05-03 08:29:48.000000000 -0400
+++ clksrc-mask/arch/i386/kernel/hpet.c 2006-05-03 09:43:03.000000000 -0400
@@ -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_hp
.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,
diff -ruNp -X dontdiff -X exclude-diffs linux-2.6.17-rc3-mm1/arch/i386/kernel/i8253.c clksrc-mask/arch/i386/kernel/i8253.c
--- linux-2.6.17-rc3-mm1/arch/i386/kernel/i8253.c 2006-05-03 08:29:48.000000000 -0400
+++ clksrc-mask/arch/i386/kernel/i8253.c 2006-05-03 09:45:33.000000000 -0400
@@ -69,7 +69,7 @@ static struct clocksource clocksource_pi
.name = "pit",
.rating = 110,
.read = pit_read,
- .mask = (cycle_t)-1,
+ .mask = CLOCKSOURCE_MASK(64),
.mult = 0,
.shift = 20,
};
diff -ruNp -X dontdiff -X exclude-diffs linux-2.6.17-rc3-mm1/arch/i386/kernel/tsc.c clksrc-mask/arch/i386/kernel/tsc.c
--- linux-2.6.17-rc3-mm1/arch/i386/kernel/tsc.c 2006-05-03 08:29:48.000000000 -0400
+++ clksrc-mask/arch/i386/kernel/tsc.c 2006-05-03 09:42:22.000000000 -0400
@@ -337,7 +337,7 @@ static struct clocksource clocksource_ts
.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,
diff -ruNp -X dontdiff -X exclude-diffs linux-2.6.17-rc3-mm1/drivers/clocksource/acpi_pm.c clksrc-mask/drivers/clocksource/acpi_pm.c
--- linux-2.6.17-rc3-mm1/drivers/clocksource/acpi_pm.c 2006-05-03 08:29:58.000000000 -0400
+++ clksrc-mask/drivers/clocksource/acpi_pm.c 2006-05-03 08:58:53.000000000 -0400
@@ -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)
{
diff -ruNp -X dontdiff -X exclude-diffs linux-2.6.17-rc3-mm1/drivers/clocksource/cyclone.c clksrc-mask/drivers/clocksource/cyclone.c
--- linux-2.6.17-rc3-mm1/drivers/clocksource/cyclone.c 2006-05-03 08:29:58.000000000 -0400
+++ clksrc-mask/drivers/clocksource/cyclone.c 2006-05-03 08:58:53.000000000 -0400
@@ -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_cy
.name = "cyclone",
.rating = 250,
.read = read_cyclone,
- .mask = (cycle_t)CYCLONE_TIMER_MASK,
+ .mask = CYCLONE_TIMER_MASK,
.mult = 10,
.shift = 0,
.is_continuous = 1,
diff -ruNp -X dontdiff -X exclude-diffs linux-2.6.17-rc3-mm1/include/linux/clocksource.h clksrc-mask/include/linux/clocksource.h
--- linux-2.6.17-rc3-mm1/include/linux/clocksource.h 2006-05-03 08:30:25.000000000 -0400
+++ clksrc-mask/include/linux/clocksource.h 2006-05-03 10:35:40.000000000 -0400
@@ -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

-
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