linux-kernel - [PATCH] x86: honor ACPI FADT flag indicating absence of a CMOS RTC

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Date:	Wed, 16 Oct 2013 12:37:34 +0100
From:	"Jan Beulich" <JBeulich@...e.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: honor ACPI FADT flag indicating absence of a CMOS
 RTC

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

Signed-off-by: Jan Beulich <jbeulich@...e.com>

---
 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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