build: Replace KERNEL_LOCKUP_DETECTOR with KERNEL_SOFTLOCKUP_DETECTOR
The LOCKUP_DETECTOR configuration option split into the SOFTLOCKUP_DETECTOR and HARDLOCKUP_DETECTOR configuration option some time ago. The HARDLOCKUP_DETECTOR option is only working on some architectures, but SOFTLOCKUP_DETECTOR should work everywhere. Replace KERNEL_LOCKUP_DETECTOR with KERNEL_SOFTLOCKUP_DETECTOR. LOCKUP_DETECTOR will be selected by SOFTLOCKUP_DETECTOR automatically. Fixes: b951f53fbae3 ("build: Add additional kernel debug options") Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
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@ -436,34 +436,22 @@ config KERNEL_PROVE_LOCKING
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select KERNEL_DEBUG_KERNEL
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default n
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config KERNEL_LOCKUP_DETECTOR
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bool "Compile the kernel with detect Hard and Soft Lockups"
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config KERNEL_SOFTLOCKUP_DETECTOR
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bool "Compile the kernel with detect Soft Lockups"
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depends on KERNEL_DEBUG_KERNEL
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help
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Say Y here to enable the kernel to act as a watchdog to detect
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hard and soft lockups.
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soft lockups.
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Softlockups are bugs that cause the kernel to loop in kernel
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mode for more than 20 seconds, without giving other tasks a
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chance to run. The current stack trace is displayed upon
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detection and the system will stay locked up.
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Hardlockups are bugs that cause the CPU to loop in kernel mode
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for more than 10 seconds, without letting other interrupts have a
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chance to run. The current stack trace is displayed upon detection
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and the system will stay locked up.
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The overhead should be minimal. A periodic hrtimer runs to
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generate interrupts and kick the watchdog task every 4 seconds.
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An NMI is generated every 10 seconds or so to check for hardlockups.
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The frequency of hrtimer and NMI events and the soft and hard lockup
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thresholds can be controlled through the sysctl watchdog_thresh.
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config KERNEL_DETECT_HUNG_TASK
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bool "Compile the kernel with detect Hung Tasks"
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depends on KERNEL_DEBUG_KERNEL
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default KERNEL_LOCKUP_DETECTOR
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default KERNEL_SOFTLOCKUP_DETECTOR
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help
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Say Y here to enable the kernel to detect "hung tasks",
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which are bugs that cause the task to be stuck in
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