build: Add additional kernel debug options

Make it possible to activate some additional kernel debug options.
This can be used to debug some problems in kernel drivers.

Signed-off-by: Hauke Mehrtens <hauke.mehrtens@intel.com>
Reviewed-by: Alexandru Ardelean <ardeleanalex@gmail.com>

diff --git a/config/Config-kernel.in b/config/Config-kernel.in
index 5e677e6afdef72b4b55b3a93af33b6189980efc1..52e74a175b130a9e2e90b9aa711913b8d39034c1 100644 (file)
--- a/config/Config-kernel.in
+++ b/config/Config-kernel.in
@@ -377,6 +377,74 @@ config KERNEL_PROVE_LOCKING
        select KERNEL_DEBUG_KERNEL
        default n
 
+config KERNEL_LOCKUP_DETECTOR
+       bool "Compile the kernel with detect Hard and Soft Lockups"
+       depends on KERNEL_DEBUG_KERNEL
+       help
+         Say Y here to enable the kernel to act as a watchdog to detect
+         hard and soft lockups.
+
+         Softlockups are bugs that cause the kernel to loop in kernel
+         mode for more than 20 seconds, without giving other tasks a
+         chance to run.  The current stack trace is displayed upon
+         detection and the system will stay locked up.
+
+         Hardlockups are bugs that cause the CPU to loop in kernel mode
+         for more than 10 seconds, without letting other interrupts have a
+         chance to run.  The current stack trace is displayed upon detection
+         and the system will stay locked up.
+
+         The overhead should be minimal.  A periodic hrtimer runs to
+         generate interrupts and kick the watchdog task every 4 seconds.
+         An NMI is generated every 10 seconds or so to check for hardlockups.
+
+         The frequency of hrtimer and NMI events and the soft and hard lockup
+         thresholds can be controlled through the sysctl watchdog_thresh.
+
+config KERNEL_DETECT_HUNG_TASK
+       bool "Compile the kernel with detect Hung Tasks"
+       depends on KERNEL_DEBUG_KERNEL
+       default KERNEL_LOCKUP_DETECTOR
+       help
+         Say Y here to enable the kernel to detect "hung tasks",
+         which are bugs that cause the task to be stuck in
+         uninterruptible "D" state indefinitely.
+
+         When a hung task is detected, the kernel will print the
+         current stack trace (which you should report), but the
+         task will stay in uninterruptible state. If lockdep is
+         enabled then all held locks will also be reported. This
+         feature has negligible overhead.
+
+config KERNEL_WQ_WATCHDOG
+       bool "Compile the kernel with detect Workqueue Stalls"
+       depends on KERNEL_DEBUG_KERNEL
+       help
+         Say Y here to enable stall detection on workqueues.  If a
+         worker pool doesn't make forward progress on a pending work
+         item for over a given amount of time, 30s by default, a
+         warning message is printed along with dump of workqueue
+         state.  This can be configured through kernel parameter
+         "workqueue.watchdog_thresh" and its sysfs counterpart.
+
+config KERNEL_DEBUG_ATOMIC_SLEEP
+       bool "Compile the kernel with sleep inside atomic section checking"
+       depends on KERNEL_DEBUG_KERNEL
+       help
+         If you say Y here, various routines which may sleep will become very
+         noisy if they are called inside atomic sections: when a spinlock is
+         held, inside an rcu read side critical section, inside preempt disabled
+         sections, inside an interrupt, etc...
+
+config KERNEL_DEBUG_VM
+       bool "Compile the kernel with debug VM"
+       depends on KERNEL_DEBUG_KERNEL
+       help
+         Enable this to turn on extended checks in the virtual-memory system
+          that may impact performance.
+
+         If unsure, say N.
+
 config KERNEL_PRINTK_TIME
        bool "Enable printk timestamps"
        default y

diff --git a/target/linux/generic/config-4.14 b/target/linux/generic/config-4.14
index 5a9b82db80979807c90705f6557a251565a32e89..d1ce30d2f78d96a22245304aafb55faaf9bc2711 100644 (file)
--- a/target/linux/generic/config-4.14
+++ b/target/linux/generic/config-4.14
@@ -594,6 +594,7 @@ CONFIG_BLOCK=y
 # CONFIG_BONDING is not set
 # CONFIG_BOOKE_WDT is not set
 CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT=3
+# CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
 # CONFIG_BOOT_PRINTK_DELAY is not set
 CONFIG_BOOT_RAW=y
 CONFIG_BPF=y
@@ -1073,6 +1074,9 @@ CONFIG_DEBUG_KERNEL=y
 # CONFIG_DEBUG_UART_BCM63XX is not set
 # CONFIG_DEBUG_VIRTUAL is not set
 # CONFIG_DEBUG_VM is not set
+# CONFIG_DEBUG_VM_PGFLAGS is not set
+# CONFIG_DEBUG_VM_RB is not set
+# CONFIG_DEBUG_VM_VMACACHE is not set
 # CONFIG_DEBUG_WQ_FORCE_RR_CPU is not set
 # CONFIG_DEBUG_WW_MUTEX_SLOWPATH is not set
 # CONFIG_DEBUG_WX is not set
@@ -1081,6 +1085,7 @@ CONFIG_DEBUG_KERNEL=y
 CONFIG_DEFAULT_CUBIC=y
 CONFIG_DEFAULT_DEADLINE=y
 CONFIG_DEFAULT_HOSTNAME="(none)"
+CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
 CONFIG_DEFAULT_IOSCHED="deadline"
 CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
 # CONFIG_DEFAULT_NOOP is not set

diff --git a/target/linux/generic/config-4.19 b/target/linux/generic/config-4.19
index 372cad70a6e89dfc85638e3ffb8ad6af64ae6c17..153520c396b59464300fcbd8b5e95d8727b4c382 100644 (file)
--- a/target/linux/generic/config-4.19
+++ b/target/linux/generic/config-4.19
@@ -617,6 +617,7 @@ CONFIG_BLOCK=y
 # CONFIG_BONDING is not set
 # CONFIG_BOOKE_WDT is not set
 CONFIG_BOOKE_WDT_DEFAULT_TIMEOUT=3
+# CONFIG_BOOTPARAM_HUNG_TASK_PANIC is not set
 # CONFIG_BOOT_PRINTK_DELAY is not set
 CONFIG_BOOT_RAW=y
 CONFIG_BPF=y
@@ -1131,6 +1132,9 @@ CONFIG_DEBUG_KERNEL=y
 # CONFIG_DEBUG_UART_BCM63XX is not set
 # CONFIG_DEBUG_VIRTUAL is not set
 # CONFIG_DEBUG_VM is not set
+# CONFIG_DEBUG_VM_PGFLAGS is not set
+# CONFIG_DEBUG_VM_RB is not set
+# CONFIG_DEBUG_VM_VMACACHE is not set
 # CONFIG_DEBUG_WQ_FORCE_RR_CPU is not set
 # CONFIG_DEBUG_WW_MUTEX_SLOWPATH is not set
 # CONFIG_DEBUG_WX is not set
@@ -1139,6 +1143,7 @@ CONFIG_DEBUG_KERNEL=y
 CONFIG_DEFAULT_CUBIC=y
 CONFIG_DEFAULT_DEADLINE=y
 CONFIG_DEFAULT_HOSTNAME="(none)"
+CONFIG_DEFAULT_HUNG_TASK_TIMEOUT=120
 CONFIG_DEFAULT_IOSCHED="deadline"
 CONFIG_DEFAULT_MMAP_MIN_ADDR=4096
 # CONFIG_DEFAULT_NOOP is not set