linux-kernel - [PATCH] cpuidle: fix unmet dependencies on ARCH_SUSPEND_POSSIBLE for ARM_CPU

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Message-Id: <20211029215256.20329-1-julianbraha@gmail.com>
Date:   Fri, 29 Oct 2021 17:52:56 -0400
From:   Julian Braha <julianbraha@...il.com>
To:     rafael@...nel.org, daniel.lezcano@...aro.org
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        fazilyildiran@...il.com
Subject: [PATCH] cpuidle: fix unmet dependencies on ARCH_SUSPEND_POSSIBLE for ARM_CPU_SUSPEND

When ARM_TEGRA_CPUIDLE or ARM_QCOM_SPM_CPUIDLE are selected,
and ARCH_SUSPEND_POSSIBLE is disabled, Kbuild gives the
following warnings:

WARNING: unmet direct dependencies detected for ARM_CPU_SUSPEND
  Depends on [n]: ARCH_SUSPEND_POSSIBLE [=n]
  Selected by [y]:
  - ARM_TEGRA_CPUIDLE [=y] && CPU_IDLE [=y] && (ARM [=y] || ARM64) && (ARCH_TEGRA [=n] || COMPILE_TEST [=y]) && !ARM64 && MMU [=y]

and

WARNING: unmet direct dependencies detected for ARM_CPU_SUSPEND
  Depends on [n]: ARCH_SUSPEND_POSSIBLE [=n]
  Selected by [y]:
  - ARM_QCOM_SPM_CPUIDLE [=y] && CPU_IDLE [=y] && (ARM [=y] || ARM64) && (ARCH_QCOM [=n] || COMPILE_TEST [=y]) && !ARM64 && MMU [=y]

This is because these options enable ARM_CPU_SUSPEND
without selecting or depending on ARCH_SUSPEND_POSSIBLE,
despite ARM_CPU_SUSPEND depending on ARCH_SUSPEND_POSSIBLE.

These unmet dependency bugs were detected by Kismet,
a static analysis tool for Kconfig. Please advise if
this is not the appropriate solution.

Signed-off-by: Julian Braha <julianbraha@...il.com>
---
 drivers/cpuidle/Kconfig.arm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/cpuidle/Kconfig.arm b/drivers/cpuidle/Kconfig.arm
index 15d6c46c0a47..1b4f5ae1ee05 100644
--- a/drivers/cpuidle/Kconfig.arm
+++ b/drivers/cpuidle/Kconfig.arm
@@ -100,6 +100,7 @@ config ARM_MVEBU_V7_CPUIDLE
 config ARM_TEGRA_CPUIDLE
 	bool "CPU Idle Driver for NVIDIA Tegra SoCs"
 	depends on (ARCH_TEGRA || COMPILE_TEST) && !ARM64 && MMU
+	depends on ARCH_SUSPEND_POSSIBLE
 	select ARCH_NEEDS_CPU_IDLE_COUPLED if SMP
 	select ARM_CPU_SUSPEND
 	help
@@ -108,6 +109,7 @@ config ARM_TEGRA_CPUIDLE
 config ARM_QCOM_SPM_CPUIDLE
 	bool "CPU Idle Driver for Qualcomm Subsystem Power Manager (SPM)"
 	depends on (ARCH_QCOM || COMPILE_TEST) && !ARM64 && MMU
+	depends on ARCH_SUSPEND_POSSIBLE
 	select ARM_CPU_SUSPEND
 	select CPU_IDLE_MULTIPLE_DRIVERS
 	select DT_IDLE_STATES
-- 
2.30.2