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time/sched_clock: Disable interrupts in sched_clock_register()

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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>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Link: https://lore.kernel.org/r/20200107010630.954648-1-paul@crapouillou.net
This commit is contained in:
Paul Cercueil 2020-01-07 02:06:29 +01:00 committed by Thomas Gleixner
parent c79f46a282
commit 2707745533
1 changed files with 5 additions and 2 deletions
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7
kernel/time/sched_clock.c
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@ -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);
}