[PATCH 3/3] arm64: Convert __delay_cycles() to arch_timer_read_vcounter()
From: Marc Zyngier <maz@kernel.org>
Date: 2026-02-26 08:22:49
Subsystem:
arm64 port (aarch64 architecture), the rest · Maintainers:
Catalin Marinas, Will Deacon, Linus Torvalds
Relax the need for disabling preemption in __delay_cycles() by using arch_timer_read_vcounter(), which will disable preemption only when this is actually required. Signed-off-by: Marc Zyngier <maz@kernel.org> --- arch/arm64/lib/delay.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/arm64/lib/delay.c b/arch/arm64/lib/delay.c
index e278e060e78a9..a667df920697d 100644
--- a/arch/arm64/lib/delay.c
+++ b/arch/arm64/lib/delay.c@@ -32,10 +32,9 @@ static inline unsigned long xloops_to_cycles(unsigned long xloops) * Note that userspace cannot change the offset behind our back either, * as the vcpu mutex is held as long as KVM_RUN is in progress. */ -static cycles_t notrace __delay_cycles(void) +static cycles_t __delay_cycles(void) { - guard(preempt_notrace)(); - return __arch_counter_get_cntvct_stable(); + return arch_timer_read_vcounter(); } void __delay(unsigned long cycles)
--
2.47.3