From d0a5d78ebc6fdf88f99d3ffb7ec4d899eb378355 Mon Sep 17 00:00:00 2001 From: Jacob Kroon Date: Tue, 26 Aug 2014 10:12:44 +0200 Subject: linux-imx-rt: Use 'performance' as default cpufreq governor Since CPU frequency scaling is a bad idea for real-time systems anyway, use 'performance' and disable the remaining cpufreq governors. Avoids the following issue: BUG: scheduling while atomic: swapper/0/0/0x00000002 Modules linked in: Preemption disabled at:[< (null)>] (null) CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.10.17-rt12-monkey+g232293e #1 [<80013c7c>] (unwind_backtrace+0x0/0xec) from [<80011644>] (show_stack+0x10/0x14) [<80011644>] (show_stack+0x10/0x14) from [<8004e160>] (__schedule_bug+0x60/0xa8) [<8004e160>] (__schedule_bug+0x60/0xa8) from [<80643458>] (__schedule+0x408/0x4a8) [<80643458>] (__schedule+0x408/0x4a8) from [<8064352c>] (schedule+0x34/0xa4) [<8064352c>] (schedule+0x34/0xa4) from [<80644104>] (rt_spin_lock_slowlock+0xc0/0x298) [<80644104>] (rt_spin_lock_slowlock+0xc0/0x298) from [<80033780>] (lock_timer_base.isra.29+0x2c/0x4c) [<80033780>] (lock_timer_base.isra.29+0x2c/0x4c) from [<80033944>] (mod_timer+0x60/0x1c4) [<80033944>] (mod_timer+0x60/0x1c4) from [<8044bcc8>] (cpufreq_interactive_idle_notifier+0x148/0x180) [<8044bcc8>] (cpufreq_interactive_idle_notifier+0x148/0x180) from [<8004ad40>] (notifier_call_chain+0x44/0x84) [<8004ad40>] (notifier_call_chain+0x44/0x84) from [<8004afd4>] (atomic_notifier_call_chain+0x34/0x48) [<8004afd4>] (atomic_notifier_call_chain+0x34/0x48) from [<8005d9a0>] (cpu_startup_entry+0xfc/0x164) [<8005d9a0>] (cpu_startup_entry+0xfc/0x164) from [<80c1cab4>] (start_kernel+0x324/0x330) [<80c1cab4>] (start_kernel+0x324/0x330) from [<10008074>] (0x10008074) See: https://lkml.org/lkml/2014/6/10/457 https://lists.yoctoproject.org/pipermail/meta-freescale/2014-June/008957.html Signed-off-by: Jacob Kroon Signed-off-by: Otavio Salvador --- recipes-kernel/linux/linux-imx-rt-3.10.17/mx6/defconfig | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) (limited to 'recipes-kernel') diff --git a/recipes-kernel/linux/linux-imx-rt-3.10.17/mx6/defconfig b/recipes-kernel/linux/linux-imx-rt-3.10.17/mx6/defconfig index 0144b3d..1d38f4e 100644 --- a/recipes-kernel/linux/linux-imx-rt-3.10.17/mx6/defconfig +++ b/recipes-kernel/linux/linux-imx-rt-3.10.17/mx6/defconfig @@ -36,11 +36,7 @@ CONFIG_AEABI=y CONFIG_HIGHMEM=y CONFIG_CMDLINE="noinitrd console=ttymxc0,115200" CONFIG_CPU_FREQ=y -CONFIG_CPU_FREQ_DEFAULT_GOV_INTERACTIVE=y -CONFIG_CPU_FREQ_GOV_POWERSAVE=y -CONFIG_CPU_FREQ_GOV_USERSPACE=y -CONFIG_CPU_FREQ_GOV_ONDEMAND=y -CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y +# CONFIG_CPU_FREQ_STAT is not set CONFIG_ARM_IMX6_CPUFREQ=y CONFIG_CPU_IDLE=y CONFIG_VFP=y -- cgit v1.2.3-54-g00ecf