linux-kernel - [PATCH v4 1/4] RISC-V: Remove per cpu clocksource

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Date:   Fri,  2 Aug 2019 21:27:20 -0700
From:   Atish Patra <atish.patra@....com>
To:     linux-kernel@...r.kernel.org
Cc:     Atish Patra <atish.patra@....com>,
        Alan Kao <alankao@...estech.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup.patel@....com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        devicetree@...r.kernel.org, Enrico Weigelt <info@...ux.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johan Hovold <johan@...nel.org>,
        linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Palmer Dabbelt <palmer@...ive.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH v4 1/4] 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/timer-riscv.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/clocksource/timer-riscv.c b/drivers/clocksource/timer-riscv.c
index 5e6038fbf115..09e031176bc6 100644
--- a/drivers/clocksource/timer-riscv.c
+++ b/drivers/clocksource/timer-riscv.c
@@ -55,7 +55,7 @@ static u64 riscv_sched_clock(void)
 	return get_cycles64();
 }
 
-static DEFINE_PER_CPU(struct clocksource, riscv_clocksource) = {
+static struct clocksource riscv_clocksource = {
 	.name		= "riscv_clocksource",
 	.rating		= 300,
 	.mask		= CLOCKSOURCE_MASK(64),
@@ -92,7 +92,6 @@ void riscv_timer_interrupt(void)
 static int __init riscv_timer_init_dt(struct device_node *n)
 {
 	int cpuid, hartid, error;
-	struct clocksource *cs;
 
 	hartid = riscv_of_processor_hartid(n);
 	if (hartid < 0) {
@@ -112,8 +111,7 @@ static int __init riscv_timer_init_dt(struct device_node *n)
 
 	pr_info("%s: Registering clocksource cpuid [%d] hartid [%d]\n",
 	       __func__, cpuid, hartid);
-	cs = per_cpu_ptr(&riscv_clocksource, cpuid);
-	error = clocksource_register_hz(cs, riscv_timebase);
+	error = clocksource_register_hz(&riscv_clocksource, riscv_timebase);
 	if (error) {
 		pr_err("RISCV timer register failed [%d] for cpu = [%d]\n",
 		       error, cpuid);
-- 
2.21.0