add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/clocksource/acpi_pm.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * linux/drivers/clocksource/acpi_pm.c
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  *
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@@ -12,8 +13,6 @@
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  *
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  * Based on parts of linux/drivers/acpi/hardware/hwtimer.c, timer_pit.c,
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  * timer_hpet.c, and on Arjan van de Ven's implementation for 2.4.
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- *
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- * This file is licensed under the GPL v2.
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  */
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 #include <linux/acpi_pmtmr.h>
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@@ -230,8 +229,10 @@
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 	int ret;
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 	ret = kstrtouint(arg, 16, &base);
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-	if (ret)
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-		return ret;
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+	if (ret) {
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+		pr_warn("PMTMR: invalid 'pmtmr=' value: '%s'\n", arg);
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+		return 1;
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+	}
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 	pr_info("PMTMR IOPort override: 0x%04x -> 0x%04x\n", pmtmr_ioport,
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 		base);