69 lines
2.0 KiB
Diff
69 lines
2.0 KiB
Diff
From 7d3b1ca751840f53036c303af2472b5dd020016a Mon Sep 17 00:00:00 2001
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Wed, 2 Nov 2016 16:45:58 +0100
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Subject: [PATCH 040/352] rcu: update: make RCU_EXPEDITE_BOOT default
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RCU_EXPEDITE_BOOT should speed up the boot process by enforcing
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synchronize_rcu_expedited() instead of synchronize_rcu() during the boot
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process. There should be no reason why one does not want this and there
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is no need worry about real time latency at this point.
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Therefore make it default.
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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init/Kconfig | 13 -------------
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kernel/rcu/update.c | 6 ++----
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2 files changed, 2 insertions(+), 17 deletions(-)
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diff --git a/init/Kconfig b/init/Kconfig
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index d5a88fb..fd6d8c2 100644
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -790,19 +790,6 @@ config RCU_NOCB_CPU_ALL
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endchoice
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-config RCU_EXPEDITE_BOOT
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- bool
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- default n
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- help
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- This option enables expedited grace periods at boot time,
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- as if rcu_expedite_gp() had been invoked early in boot.
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- The corresponding rcu_unexpedite_gp() is invoked from
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- rcu_end_inkernel_boot(), which is intended to be invoked
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- at the end of the kernel-only boot sequence, just before
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- init is exec'ed.
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-
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- Accept the default if unsure.
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-
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endmenu # "RCU Subsystem"
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config BUILD_BIN2C
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diff --git a/kernel/rcu/update.c b/kernel/rcu/update.c
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index 4f6db7e..019b470 100644
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--- a/kernel/rcu/update.c
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+++ b/kernel/rcu/update.c
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@@ -132,8 +132,7 @@ bool rcu_gp_is_normal(void)
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}
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EXPORT_SYMBOL_GPL(rcu_gp_is_normal);
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-static atomic_t rcu_expedited_nesting =
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- ATOMIC_INIT(IS_ENABLED(CONFIG_RCU_EXPEDITE_BOOT) ? 1 : 0);
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+static atomic_t rcu_expedited_nesting = ATOMIC_INIT(1);
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/*
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* Should normal grace-period primitives be expedited? Intended for
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@@ -182,8 +181,7 @@ EXPORT_SYMBOL_GPL(rcu_unexpedite_gp);
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*/
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void rcu_end_inkernel_boot(void)
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{
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- if (IS_ENABLED(CONFIG_RCU_EXPEDITE_BOOT))
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- rcu_unexpedite_gp();
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+ rcu_unexpedite_gp();
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if (rcu_normal_after_boot)
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WRITE_ONCE(rcu_normal, 1);
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}
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--
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2.7.4
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