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

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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>
This commit is contained in:
Jan Beulich 2013-10-21 09:31:57 +01:00 committed by Ingo Molnar
parent 77748e6315
commit ee5872befc
1 changed files with 8 additions and 0 deletions
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8
arch/x86/kernel/rtc.c
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@ -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");