From 0139085310c40853cc429d5c38fd66e540c97d34 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Mon, 23 Feb 2026 16:31:49 +0100 Subject: [PATCH] x86: rtc: Drop PNP device check Previous changes effectively prevented PNP devices from being created for the CMOS RTC on x86 with ACPI. Although in principle a CMOS RTC PNP device may exist on an x86 system without ACPI (that is, an x86 system where there is no ACPI at all, not one booted with ACPI disabled), such systems were there in the field ~30 years ago and most likely they would not be able to run a contemporary Linux kernel. For the above reasons, drop the PNP device check from add_rtc_cmos(). Signed-off-by: Rafael J. Wysocki Acked-by: Dave Hansen # x86 Link: https://patch.msgid.link/8660687.T7Z3S40VBb@rafael.j.wysocki --- arch/x86/kernel/rtc.c | 17 +---------------- 1 file changed, 1 insertion(+), 16 deletions(-) diff --git a/arch/x86/kernel/rtc.c b/arch/x86/kernel/rtc.c index b112178e8185..314b062a15de 100644 --- a/arch/x86/kernel/rtc.c +++ b/arch/x86/kernel/rtc.c @@ -6,7 +6,6 @@ #include #include #include -#include #include #include @@ -134,19 +133,6 @@ static struct platform_device rtc_device = { static __init int add_rtc_cmos(void) { -#ifdef CONFIG_PNP - static const char * const ids[] __initconst = - { "PNP0b00", "PNP0b01", "PNP0b02", }; - struct pnp_dev *dev; - int i; - - pnp_for_each_dev(dev) { - for (i = 0; i < ARRAY_SIZE(ids); i++) { - if (compare_pnp_id(dev->id, ids[i]) != 0) - return 0; - } - } -#endif if (cmos_rtc_platform_device_present) return 0; @@ -154,8 +140,7 @@ static __init int add_rtc_cmos(void) return -ENODEV; platform_device_register(&rtc_device); - dev_info(&rtc_device.dev, - "registered platform RTC device (no PNP device found)\n"); + dev_info(&rtc_device.dev, "registered fallback platform RTC device\n"); return 0; }