From: Steven Rostedt <rostedt@goodmis.org>
To: linux-kernel@vger.kernel.org,
linux-rt-users <linux-rt-users@vger.kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Carsten Emde <C.Emde@osadl.org>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
John Kacur <jkacur@redhat.com>,
Paul Gortmaker <paul.gortmaker@windriver.com>
Subject: [PATCH RT 04/11] ARM: imx: always use TWD on IMX6Q
Date: Tue, 12 Jul 2016 12:49:54 -0400 [thread overview]
Message-ID: <20160712165020.420235092@goodmis.org> (raw)
In-Reply-To: 20160712164950.490572026@goodmis.org
[-- Attachment #1: 0004-ARM-imx-always-use-TWD-on-IMX6Q.patch --]
[-- Type: text/plain, Size: 1093 bytes --]
3.12.61-rt82-rc1 stable review patch.
If anyone has any objections, please let me know.
------------------
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
There is no reason to limit the TWD to be used on SMP kernels only if the
hardware has it available.
On Wandboard i.MX6SOLO, running PREEMPT-RT and cyclictest I see as max
immediately after start in idle:
UP : ~90us
SMP: ~50us
UP + TWD: ~20us.
Based on this numbers I prefer the TWD over the slightly slower MXC
timer.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
arch/arm/mach-imx/Kconfig | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/arm/mach-imx/Kconfig b/arch/arm/mach-imx/Kconfig
index 29a8af6922a8..79671485618a 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -794,7 +794,7 @@ config SOC_IMX6Q
select COMMON_CLK
select CPU_V7
select HAVE_ARM_SCU if SMP
- select HAVE_ARM_TWD if SMP
+ select HAVE_ARM_TWD
select HAVE_IMX_ANATOP
select HAVE_IMX_GPC
select HAVE_IMX_MMDC
--
2.8.1
next prev parent reply other threads:[~2016-07-12 16:49 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-12 16:49 [PATCH RT 00/11] Linux 3.12.61-rt82-rc1 Steven Rostedt
2016-07-12 16:49 ` [PATCH RT 01/11] kvm, rt: change async pagefault code locking for PREEMPT_RT Steven Rostedt
2016-07-12 16:49 ` [PATCH RT 02/11] net: dev: always take qdiscs busylock in __dev_xmit_skb() Steven Rostedt
2016-07-12 16:49 ` [PATCH RT 03/11] list_bl: fixup bogus lockdep warning Steven Rostedt
2016-07-12 16:49 ` Steven Rostedt [this message]
2016-07-12 16:49 ` [PATCH RT 05/11] kernel/printk: Dont try to print from IRQ/NMI region Steven Rostedt
2016-07-12 16:49 ` [PATCH RT 06/11] arm: lazy preempt: correct resched condition Steven Rostedt
2016-07-12 16:49 ` [PATCH RT 07/11] locallock: add local_lock_on() Steven Rostedt
2016-07-12 16:49 ` [PATCH RT 08/11] mm: perform lru_add_drain_all() remotely Steven Rostedt
2016-07-12 16:49 ` [PATCH RT 09/11] trace: correct off by one while recording the trace-event Steven Rostedt
2016-07-12 16:50 ` [PATCH RT 10/11] x86: Fix an RT MCE crash Steven Rostedt
2016-07-12 16:50 ` [PATCH RT 11/11] Linux 3.12.61-rt82-rc1 Steven Rostedt
2016-07-12 23:23 ` Linux 3.12.61-rt82-rc2 Steven Rostedt
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