diff options
Diffstat (limited to 'lib/Kconfig.debug')
| -rw-r--r-- | lib/Kconfig.debug | 24 |
1 files changed, 23 insertions, 1 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 82928f5ea049..13a937b16bfd 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -62,6 +62,28 @@ config MAGIC_SYSRQ keys are documented in <file:Documentation/sysrq.txt>. Don't say Y unless you really know what this hack does. +config MAGIC_SYSRQ_FORCE_PRINTK + bool "Force printk from Magic SysRq" + depends on MAGIC_SYSRQ && PREEMPT_RT_FULL + default n + help + Allow the output from Magic SysRq to be output immediately, even if + this causes large latencies. This can cause performance problems + for real-time processes. + + If PREEMPT_RT_FULL, printk() will not try to acquire the console lock + when interrupts or preemption are disabled. If the console lock is + not acquired the printk() output will be buffered, but will not be + output immediately. Some drivers call into the Magic SysRq code + with interrupts or preemption disabled, so the output of Magic SysRq + will be buffered instead of printing immediately if this option is + not selected. + + Even with this option selected, Magic SysRq output will be delayed + if the attempt to acquire the console lock fails. + + Don't say Y unless you really know what this hack does. + config STRIP_ASM_SYMS bool "Strip assembler-generated symbols during link" default n @@ -151,7 +173,7 @@ config DEBUG_KERNEL config DEBUG_SHIRQ bool "Debug shared IRQ handlers" - depends on DEBUG_KERNEL && GENERIC_HARDIRQS + depends on DEBUG_KERNEL && GENERIC_HARDIRQS && !PREEMPT_RT_BASE help Enable this to generate a spurious interrupt as soon as a shared interrupt handler is registered, and just before one is deregistered. |