From: Dmitry Osipenko <digetx@gmail.com>
To: Thierry Reding <thierry.reding@gmail.com>,
Jonathan Hunter <jonathanh@nvidia.com>,
Peter De Schrijver <pdeschrijver@nvidia.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: linux-pm@vger.kernel.org, linux-tegra@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH v6 12/18] arm: tegra20/30: cpuidle: Remove unnecessary memory barrier
Date: Tue, 15 Oct 2019 20:00:09 +0300 [thread overview]
Message-ID: <20191015170015.1135-13-digetx@gmail.com> (raw)
In-Reply-To: <20191015170015.1135-1-digetx@gmail.com>
There is no good justification for smp_rmb() after returning from LP2
because there are no memory operations that require SMP synchronization.
Thus remove the confusing barrier.
Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
---
arch/arm/mach-tegra/cpuidle-tegra20.c | 2 --
arch/arm/mach-tegra/cpuidle-tegra30.c | 2 --
2 files changed, 4 deletions(-)
diff --git a/arch/arm/mach-tegra/cpuidle-tegra20.c b/arch/arm/mach-tegra/cpuidle-tegra20.c
index fe80f1988120..af2cd339db43 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra20.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra20.c
@@ -193,8 +193,6 @@ static int tegra20_idle_lp2_coupled(struct cpuidle_device *dev,
local_fiq_enable();
- smp_rmb();
-
return entered_lp2 ? index : 0;
}
#endif
diff --git a/arch/arm/mach-tegra/cpuidle-tegra30.c b/arch/arm/mach-tegra/cpuidle-tegra30.c
index a4f0add46a27..80ae64bcdf50 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra30.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra30.c
@@ -113,8 +113,6 @@ static int tegra30_idle_lp2(struct cpuidle_device *dev,
local_fiq_enable();
- smp_rmb();
-
return (entered_lp2) ? index : 0;
}
#endif
--
2.23.0
next prev parent reply other threads:[~2019-10-15 17:00 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-15 16:59 [PATCH v6 00/18] Consolidate and improve NVIDIA Tegra CPUIDLE driver(s) Dmitry Osipenko
2019-10-15 16:59 ` [PATCH v6 01/18] ARM: tegra: Compile sleep-tegra20/30.S unconditionally Dmitry Osipenko
2019-10-15 16:59 ` [PATCH v6 02/18] ARM: tegra: Add tegra_pm_park_secondary_cpu() Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 03/18] ARM: tegra: Remove pen-locking from cpuidle-tegra20 Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 04/18] ARM: tegra: Change tegra_set_cpu_in_lp2() type to void Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 05/18] ARM: tegra: Propagate error from tegra_idle_lp2_last() Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 06/18] ARM: tegra: Expose PM functions required for new cpuidle driver Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 07/18] ARM: tegra: Rename some of the newly exposed PM functions Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 08/18] ARM: tegra: Make outer_disable() open-coded Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 09/18] clk: tegra: Add missing stubs for the case of !CONFIG_PM_SLEEP Dmitry Osipenko
2019-10-29 13:19 ` Thierry Reding
2019-10-15 17:00 ` [PATCH v6 10/18] arm: tegra20: cpuidle: Handle case where secondary CPU hangs on entering LP2 Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 11/18] arm: tegra20: cpuidle: Make abort_flag atomic Dmitry Osipenko
2019-10-15 17:00 ` Dmitry Osipenko [this message]
2019-10-15 17:00 ` [PATCH v6 13/18] cpuidle: Refactor and move NVIDIA Tegra20 driver into drivers/cpuidle/ Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 14/18] cpuidle: tegra: Squash Tegra30 driver into the common driver Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 15/18] cpuidle: tegra: Support CPU cluster power-down state on Tegra30 Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 16/18] cpuidle: tegra: Squash Tegra114 driver into the common driver Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 17/18] ARM: multi_v7_defconfig: Enable Tegra cpuidle driver Dmitry Osipenko
2019-10-15 17:00 ` [PATCH v6 18/18] ARM: tegra: Enable Tegra cpuidle driver in tegra_defconfig Dmitry Osipenko
2019-10-16 19:21 ` [PATCH v6 00/18] Consolidate and improve NVIDIA Tegra CPUIDLE driver(s) Peter De Schrijver
2019-10-16 19:21 ` Peter De Schrijver
2019-10-16 19:47 ` Dmitry Osipenko
2019-10-16 20:14 ` Dmitry Osipenko
2019-10-28 14:04 ` Peter De Schrijver
2019-10-28 14:04 ` Peter De Schrijver
2019-10-29 0:47 ` Dmitry Osipenko
2019-11-01 12:33 ` Peter De Schrijver
2019-11-01 12:33 ` Peter De Schrijver
2019-11-01 13:22 ` Dmitry Osipenko
2019-11-01 21:30 ` Dmitry Osipenko
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