lkml.org 
[lkml]   [2019]   [Dec]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v9 11/17] arm: tegra20/30: cpuidle: Remove unnecessary memory barrier
Date
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@nvidia.com>
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 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
\
 
 \ /
  Last update: 2019-12-18 22:08    [W:0.074 / U:21.504 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site