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 11/20] ARM: imx: always use TWD on IMX6Q
Date: Tue, 12 Jul 2016 10:24:16 -0400 [thread overview]
Message-ID: <20160712142419.367116752@goodmis.org> (raw)
In-Reply-To: 20160712142405.634544943@goodmis.org
[-- Attachment #1: 0011-ARM-imx-always-use-TWD-on-IMX6Q.patch --]
[-- Type: text/plain, Size: 1126 bytes --]
4.1.27-rt31-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 3a3d3e9d7bfd..92c0cf1276fe 100644
--- a/arch/arm/mach-imx/Kconfig
+++ b/arch/arm/mach-imx/Kconfig
@@ -558,7 +558,7 @@ config SOC_IMX6Q
bool "i.MX6 Quad/DualLite support"
select ARM_ERRATA_764369 if SMP
select HAVE_ARM_SCU if SMP
- select HAVE_ARM_TWD if SMP
+ select HAVE_ARM_TWD
select PCI_DOMAINS if PCI
select PINCTRL_IMX6Q
select SOC_IMX6
--
2.8.1
next prev parent reply other threads:[~2016-07-12 14:24 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-12 14:24 [PATCH RT 00/20] Linux 4.1.27-rt31-rc1 Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 01/20] ARM: at91: pm: simply call at91_pm_init Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 02/20] ARM: at91: pm: find and remap the pmc Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 03/20] ARM: at91: pm: move idle functions to pm.c Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 04/20] ARM: at91: remove useless includes and function prototypes Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 05/20] usb: gadget: atmel: access the PMC using regmap Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 06/20] kvm, rt: change async pagefault code locking for PREEMPT_RT Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 07/20] mm/zsmalloc: Use get/put_cpu_light in zs_map_object()/zs_unmap_object() Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 08/20] net: dev: always take qdiscs busylock in __dev_xmit_skb() Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 09/20] drivers/block/zram: Replace bit spinlocks with rtmutex for -rt Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 10/20] list_bl: fixup bogus lockdep warning Steven Rostedt
2016-07-12 14:24 ` Steven Rostedt [this message]
2016-07-12 20:04 ` [PATCH RT 11/20] ARM: imx: always use TWD on IMX6Q Sebastian Andrzej Siewior
2016-07-12 20:25 ` Steven Rostedt
2016-07-18 17:18 ` Grygorii Strashko
2016-07-12 14:24 ` [PATCH RT 12/20] drivers/block/zram: fixup compile for !RT Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 13/20] perf/x86/intel/rapl: Make PMU lock raw Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 14/20] sched,preempt: Fix preempt_count manipulations Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 15/20] kernel/printk: Dont try to print from IRQ/NMI region Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 16/20] arm: lazy preempt: correct resched condition Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 17/20] locallock: add local_lock_on() Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 18/20] mm: perform lru_add_drain_all() remotely Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 19/20] trace: correct off by one while recording the trace-event Steven Rostedt
2016-07-12 14:24 ` [PATCH RT 20/20] Linux 4.1.27-rt31-rc1 Steven Rostedt
2016-07-12 23:18 ` Linux 4.1.27-rt31-rc2 Steven Rostedt
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