Commit ee5872be authored by Jan Beulich's avatar Jan Beulich Committed by Ingo Molnar
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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: default avatarJan 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: default avatarIngo 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");