From: Paul Cercueil <paul@crapouillou.net>
To: Daniel Lezcano <daniel.lezcano@linaro.org>,
Thomas Gleixner <tglx@linutronix.de>
Cc: od@zcrc.me, linux-kernel@vger.kernel.org,
Paul Cercueil <paul@crapouillou.net>
Subject: [PATCH v2 1/2] time/sched_clock: Disable interrupts in sched_clock_register
Date: Tue, 7 Jan 2020 02:06:29 +0100 [thread overview]
Message-ID: <20200107010630.954648-1-paul@crapouillou.net> (raw)
Instead of issueing a warning if sched_clock_register is called from a
context where IRQs are enabled, the code now ensures that IRQs are
indeed disabled.
Signed-off-by: Paul Cercueil <paul@crapouillou.net>
---
Notes:
v2: New patch
kernel/time/sched_clock.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/kernel/time/sched_clock.c b/kernel/time/sched_clock.c
index dbd69052eaa6..e4332e3e2d56 100644
--- a/kernel/time/sched_clock.c
+++ b/kernel/time/sched_clock.c
@@ -169,14 +169,15 @@ sched_clock_register(u64 (*read)(void), int bits, unsigned long rate)
{
u64 res, wrap, new_mask, new_epoch, cyc, ns;
u32 new_mult, new_shift;
- unsigned long r;
+ unsigned long r, flags;
char r_unit;
struct clock_read_data rd;
if (cd.rate > rate)
return;
- WARN_ON(!irqs_disabled());
+ /* Cannot register a sched_clock with interrupts on */
+ local_irq_save(flags);
/* Calculate the mult/shift to convert counter ticks to ns. */
clocks_calc_mult_shift(&new_mult, &new_shift, rate, NSEC_PER_SEC, 3600);
@@ -233,6 +234,8 @@ sched_clock_register(u64 (*read)(void), int bits, unsigned long rate)
if (irqtime > 0 || (irqtime == -1 && rate >= 1000000))
enable_sched_clock_irqtime();
+ local_irq_restore(flags);
+
pr_debug("Registered %pS as sched_clock source\n", read);
}
--
2.24.1
next reply other threads:[~2020-01-07 1:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-07 1:06 Paul Cercueil [this message]
2020-01-07 1:06 ` [PATCH v2 2/2] clocksource: Add driver for the Ingenic JZ47xx OST Paul Cercueil
2020-01-09 14:28 ` Thomas Gleixner
2020-01-09 18:26 ` Paul Cercueil
2020-01-09 11:55 ` [PATCH v2 1/2] time/sched_clock: Disable interrupts in sched_clock_register Daniel Lezcano
2020-01-09 17:33 ` [tip: timers/core] time/sched_clock: Disable interrupts in sched_clock_register() tip-bot2 for Paul Cercueil
2020-01-09 17:56 ` tip-bot2 for Paul Cercueil
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