linux-kernel - [PATCH] ACPI: processor: idle: Add debug log for the state whose entry method is illegal

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Message-ID: <20251125064702.3666149-1-lihuisong@huawei.com>
Date: Tue, 25 Nov 2025 14:47:02 +0800
From: Huisong Li <lihuisong@...wei.com>
To: <rafael@...nel.org>, <lenb@...nel.org>
CC: <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<Sudeep.Holla@....com>, <linuxarm@...wei.com>, <jonathan.cameron@...wei.com>,
	<zhanjie9@...ilicon.com>, <zhenglifeng1@...wei.com>, <yubowen8@...wei.com>,
	<lihuisong@...wei.com>
Subject: [PATCH] ACPI: processor: idle: Add debug log for the state whose entry method is illegal

According to ACPI spec, entry method in LPI sub-package must be buffer
or integer. Driver will disable the state whose the entry method is
illegal by zero flags in struct acpi_lpi_state. The entry method is
very key in cpuidle. A debug log is very useful developers.

Signed-off-by: Huisong Li <lihuisong@...wei.com>
---
 drivers/acpi/processor_idle.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 22909fccf0b1..5f86297c8b23 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -946,6 +946,8 @@ static int acpi_processor_evaluate_lpi(acpi_handle handle,
 			lpi_state->entry_method = ACPI_CSTATE_INTEGER;
 			lpi_state->address = obj->integer.value;
 		} else {
+			pr_debug("Entry method of state-%d is illegal, disable it.\n",
+				 state_idx);
 			continue;
 		}
 
-- 
2.33.0