[v6,12/18] arm: tegra20/30: cpuidle: Remove unnecessary memory barrier
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Message ID 20191015170015.1135-13-digetx@gmail.com
State New
Headers show
Series
  • Consolidate and improve NVIDIA Tegra CPUIDLE driver(s)
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Commit Message

Dmitry Osipenko Oct. 15, 2019, 5 p.m. UTC
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(-)

Patch
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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