linux-kernel - [PATCH v3 1/3] arm_arch_timer: add macro for timer nbits

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Date:   Wed, 26 Dec 2018 11:45:07 -0500
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     catalin.marinas@....com, will.deacon@....com,
        akpm@...ux-foundation.org, rppt@...ux.vnet.ibm.com,
        mhocko@...e.com, ard.biesheuvel@...aro.org, andrew.murray@....com,
        james.morse@....com, marc.zyngier@....com, sboyd@...nel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        pasha.tatashin@...een.com
Subject: [PATCH v3 1/3] arm_arch_timer: add macro for timer nbits

The minimum value of bits arm defines for timer value is 56bits, add a new
macro ARCH_TIMER_NBITS to use it in code instead of hardcoding 56.

Signed-off-by: Pavel Tatashin <pasha.tatashin@...een.com>
---
 drivers/clocksource/arm_arch_timer.c | 8 ++++----
 include/clocksource/arm_arch_timer.h | 3 +++
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/arm_arch_timer.c b/drivers/clocksource/arm_arch_timer.c
index 9a7d4dc00b6e..e4843ad48bd3 100644
--- a/drivers/clocksource/arm_arch_timer.c
+++ b/drivers/clocksource/arm_arch_timer.c
@@ -175,13 +175,13 @@ static struct clocksource clocksource_counter = {
 	.name	= "arch_sys_counter",
 	.rating	= 400,
 	.read	= arch_counter_read,
-	.mask	= CLOCKSOURCE_MASK(56),
+	.mask	= CLOCKSOURCE_MASK(ARCH_TIMER_NBITS),
 	.flags	= CLOCK_SOURCE_IS_CONTINUOUS,
 };
 
 static struct cyclecounter cyclecounter __ro_after_init = {
 	.read	= arch_counter_read_cc,
-	.mask	= CLOCKSOURCE_MASK(56),
+	.mask	= CLOCKSOURCE_MASK(ARCH_TIMER_NBITS),
 };
 
 struct ate_acpi_oem_info {
@@ -963,8 +963,8 @@ static void __init arch_counter_register(unsigned type)
 	timecounter_init(&arch_timer_kvm_info.timecounter,
 			 &cyclecounter, start_count);
 
-	/* 56 bits minimum, so we assume worst case rollover */
-	sched_clock_register(arch_timer_read_counter, 56, arch_timer_rate);
+	sched_clock_register(arch_timer_read_counter, ARCH_TIMER_NBITS,
+			     arch_timer_rate);
 }
 
 static void arch_timer_stop(struct clock_event_device *clk)
diff --git a/include/clocksource/arm_arch_timer.h b/include/clocksource/arm_arch_timer.h
index 349e5957c949..c485512e1d01 100644
--- a/include/clocksource/arm_arch_timer.h
+++ b/include/clocksource/arm_arch_timer.h
@@ -71,6 +71,9 @@ enum arch_timer_spi_nr {
 #define ARCH_TIMER_EVT_STREAM_FREQ				\
 	(USEC_PER_SEC / ARCH_TIMER_EVT_STREAM_PERIOD_US)
 
+/* 56 bits minimum, so we assume worst case rollover */
+#define	ARCH_TIMER_NBITS		56
+
 struct arch_timer_kvm_info {
 	struct timecounter timecounter;
 	int virtual_irq;
-- 
2.20.1