linux-kernel - [PATCH 3/4] RISC-V: Remove per cpu clocksource

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Date:   Mon,  3 Dec 2018 12:57:30 -0800
From:   Atish Patra <atish.patra@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        devicetree@...r.kernel.org,
        Dmitriy Cherkasov <dmitriy@...-tech.org>,
        linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Anup Patel <anup@...infault.org>,
        Damien Le Moal <Damien.LeMoal@....com>
Subject: [PATCH 3/4] RISC-V: Remove per cpu clocksource

There is only one clocksource in RISC-V. The boot cpu initializes
that clocksource. No need to keep a percpu data structure.

Signed-off-by: Atish Patra <atish.patra@....com>
---
 drivers/clocksource/riscv_timer.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/riscv_timer.c b/drivers/clocksource/riscv_timer.c
index 96af7058..39de6e49 100644
--- a/drivers/clocksource/riscv_timer.c
+++ b/drivers/clocksource/riscv_timer.c
@@ -49,7 +49,7 @@ static unsigned long long riscv_clocksource_rdtime(struct clocksource *cs)
 	return get_cycles64();
 }
 
-static DEFINE_PER_CPU(struct clocksource, riscv_clocksource) = {
+static struct clocksource riscv_clocksource = {
 	.name		= "riscv_clocksource",
 	.rating		= 300,
 	.mask		= CLOCKSOURCE_MASK(BITS_PER_LONG),
@@ -106,7 +106,6 @@ static long __init riscv_timebase_frequency(struct device_node *node)
 static int __init riscv_timer_init_dt(struct device_node *n)
 {
 	int cpuid, hartid, error;
-	struct clocksource *cs;
 
 	hartid = riscv_of_processor_hartid(n);
 	cpuid = riscv_hartid_to_cpuid(hartid);
@@ -116,8 +115,7 @@ static int __init riscv_timer_init_dt(struct device_node *n)
 
 	/* This should be called only for boot cpu */
 	riscv_timebase = riscv_timebase_frequency(n);
-	cs = per_cpu_ptr(&riscv_clocksource, cpuid);
-	clocksource_register_hz(cs, riscv_timebase);
+	clocksource_register_hz(&riscv_clocksource, riscv_timebase);
 
 	error = cpuhp_setup_state(CPUHP_AP_RISCV_TIMER_STARTING,
 			 "clockevents/riscv/timer:starting",
-- 
2.7.4