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authorJacob Kroon <jacob.kroon@mikrodidakt.se>2014-08-26 10:12:44 +0200
committerOtavio Salvador <otavio@ossystems.com.br>2014-08-28 12:08:51 -0300
commite9bf647e10ff1e31f911d3236dbb22a1ad7ace9f (patch)
tree8b9cbedc5d2d51e74ca657e79e72c6106e57b991
parent3514d9772539bba915914124cd00314b7a407aae (diff)
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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 <jacob.kroon@mikrodidakt.se> Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
-rw-r--r--recipes-kernel/linux/linux-imx-rt-3.10.17/mx6/defconfig6
1 files changed, 1 insertions, 5 deletions
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