linux-kernel - [PATCH] arm, arm64: Fix selection of CONFIG_SCHED_THERMAL

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Message-Id: <20200729135718.1871-1-valentin.schneider@arm.com>
Date:   Wed, 29 Jul 2020 14:57:18 +0100
From:   Valentin Schneider <valentin.schneider@....com>
To:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-pm@...r.kernel.org
Cc:     Qian Cai <cai@....pw>, Russell King <linux@...linux.org.uk>,
        Thara Gopinath <thara.gopinath@...aro.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Amit Daniel Kachhap <amit.kachhap@...il.com>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Quentin Perret <qperret@...gle.com>
Subject: [PATCH] arm, arm64: Fix selection of CONFIG_SCHED_THERMAL_PRESSURE

Qian reported that the current setup forgoes the Kconfig dependencies and
results in warnings such as:

  WARNING: unmet direct dependencies detected for SCHED_THERMAL_PRESSURE
    Depends on [n]: SMP [=y] && CPU_FREQ_THERMAL [=n]
    Selected by [y]:
    - ARM64 [=y]

Revert commit

  e17ae7fea871 ("arm, arm64: Select CONFIG_SCHED_THERMAL_PRESSURE")

and re-implement it by making the option default to 'y' for arm64 and arm,
which respects Kconfig dependencies (i.e. will remain 'n' if
CPU_FREQ_THERMAL=n).

Fixes: e17ae7fea871 ("arm, arm64: Select CONFIG_SCHED_THERMAL_PRESSURE")
Reported-by: Qian Cai <cai@....pw>
Signed-off-by: Valentin Schneider <valentin.schneider@....com>
---
 arch/arm/Kconfig   | 1 -
 arch/arm64/Kconfig | 1 -
 init/Kconfig       | 2 ++
 3 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 6cd0f9f086f6..809e8047d669 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -47,7 +47,6 @@ config ARM
 	select EDAC_ATOMIC_SCRUB
 	select GENERIC_ALLOCATOR
 	select GENERIC_ARCH_TOPOLOGY if ARM_CPU_TOPOLOGY
-	select SCHED_THERMAL_PRESSURE if ARM_CPU_TOPOLOGY
 	select GENERIC_ATOMIC64 if CPU_V7M || CPU_V6 || !CPU_32v6K || !AEABI
 	select GENERIC_CLOCKEVENTS_BROADCAST if SMP
 	select GENERIC_CPU_AUTOPROBE
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 2d4abbc9f8d0..baffe8b66da2 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -192,7 +192,6 @@ config ARM64
 	select PCI_SYSCALL if PCI
 	select POWER_RESET
 	select POWER_SUPPLY
-	select SCHED_THERMAL_PRESSURE
 	select SPARSE_IRQ
 	select SWIOTLB
 	select SYSCTL_EXCEPTION_TRACE
diff --git a/init/Kconfig b/init/Kconfig
index 37b089f87804..f2244892d7a8 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -493,6 +493,8 @@ config HAVE_SCHED_AVG_IRQ
 
 config SCHED_THERMAL_PRESSURE
 	bool
+	default y if ARM && ARM_CPU_TOPOLOGY
+	default y if ARM64
 	depends on SMP
 	depends on CPU_FREQ_THERMAL
 	help
-- 
2.27.0