[PATCH v9 11/17] arm: tegra20/30: cpuidle: Remove unnecessary memory barrier

From: Dmitry Osipenko
Date: Wed Dec 18 2019 - 16:07:29 EST


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.

Acked-by: Peter De Schrijver <pdeschrijver@xxxxxxxxxx>
Signed-off-by: Dmitry Osipenko <digetx@xxxxxxxxx>
---
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 ccb8b0aa6c46..f8f14c0b79ff 100644
--- a/arch/arm/mach-tegra/cpuidle-tegra20.c
+++ b/arch/arm/mach-tegra/cpuidle-tegra20.c
@@ -194,8 +194,6 @@ 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
--
2.24.0