[PATCH] x86_64: Add cpu_relax() to busy loops in PM timer code (c36cd16f) · Commits · e / devices / android_kernel_oneplus_sm8150

arch/x86_64/kernel/pmtimer.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -86,7 +86,7 @@ static unsigned pmtimer_wait_tick(void)
		for (a = b = inl(pmtmr_ioport) & ACPI_PM_MASK;
		a == b;
		b = inl(pmtmr_ioport) & ACPI_PM_MASK)
		;
		cpu_relax();
		return b;
		}

		@@ -97,6 +97,7 @@ void pmtimer_wait(unsigned us)
		a = pmtimer_wait_tick();
		do {
		b = inl(pmtmr_ioport);
		cpu_relax();
		} while (cyc2us(b - a) < us);
		}