[PATCH] x86: honor ACPI FADT flag indicating absence of a CMOSRTC

[Jan Beulich]

We shouldn't be creating a corresponding platform device in that case.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

---
 arch/x86/kernel/rtc.c |    5 +++++
 1 file changed, 5 insertions(+)

--- 3.12-rc5/arch/x86/kernel/rtc.c
+++ 3.12-rc5-x86-ACPI-no-RTC/arch/x86/kernel/rtc.c
@@ -192,6 +192,11 @@ 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)
+		return -ENODEV;
+#endif
+
 	platform_device_register(&rtc_device);
 	dev_info(&rtc_device.dev,
 		 "registered platform RTC device (no PNP device found)\n");



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