Commit ee5872be authored Oct 21, 2013 by Jan Beulich Committed by Ingo Molnar Oct 26, 2013

x86/time: Honor ACPI FADT flag indicating absence of a CMOS RTC



Even though the omission was found only during code review
(originally in the Xen hypervisor, looking through ACPI v5 flags
and their meanings and uses), we shouldn't be creating a
corresponding platform device in that case.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/5265029D02000078000FC4D2@nat28.tlf.novell.com


Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 77748e63

arch/x86/kernel/rtc.c

+8 −0

Original line number	Diff line number	Diff line
		@@ -192,6 +192,14 @@ static __init int add_rtc_cmos(void)
		if (mrst_identify_cpu())
		return -ENODEV;

		#ifdef CONFIG_ACPI
		if (acpi_gbl_FADT.boot_flags & ACPI_FADT_NO_CMOS_RTC) {
		/* This warning can likely go away again in a year or two. */
		pr_info("ACPI: not registering RTC platform device\n");
		return -ENODEV;
		}
		#endif

		platform_device_register(&rtc_device);
		dev_info(&rtc_device.dev,
		"registered platform RTC device (no PNP device found)\n");