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-rw-r--r--arch/x86/kernel/rtc.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c
index 0aa2939..5b9dd44 100644
--- a/arch/x86/kernel/rtc.c
+++ b/arch/x86/kernel/rtc.c
@@ -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");
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