diff options
Diffstat (limited to 'lib/Kconfig.debug')
| -rw-r--r-- | lib/Kconfig.debug | 62 |
1 files changed, 36 insertions, 26 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 3e91fa33c7a0..a0b0c4decb89 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1035,16 +1035,33 @@ config BOOTPARAM_SOFTLOCKUP_PANIC Say N if unsure. +config HAVE_HARDLOCKUP_DETECTOR_BUDDY + bool + depends on SMP + default y + +# +# Global switch whether to build a hardlockup detector at all. It is available +# only when the architecture supports at least one implementation. There are +# two exceptions. The hardlockup detector is never enabled on: # -# arch/ can define HAVE_HARDLOCKUP_DETECTOR_ARCH to provide their own hard -# lockup detector rather than the perf based detector. +# s390: it reported many false positives there +# +# sparc64: has a custom implementation which is not using the common +# hardlockup command line options and sysctl interface. +# +# Note that HAVE_NMI_WATCHDOG is used to distinguish the sparc64 specific +# implementaion. It is automatically enabled also for other arch-specific +# variants which set HAVE_HARDLOCKUP_DETECTOR_ARCH. It makes the check +# of avaialable and supported variants quite tricky. # config HARDLOCKUP_DETECTOR bool "Detect Hard Lockups" depends on DEBUG_KERNEL && !S390 - depends on HAVE_HARDLOCKUP_DETECTOR_NON_ARCH || HAVE_HARDLOCKUP_DETECTOR_ARCH + depends on ((HAVE_HARDLOCKUP_DETECTOR_PERF || HAVE_HARDLOCKUP_DETECTOR_BUDDY) && !HAVE_NMI_WATCHDOG) || HAVE_HARDLOCKUP_DETECTOR_ARCH + imply HARDLOCKUP_DETECTOR_PERF + imply HARDLOCKUP_DETECTOR_BUDDY select LOCKUP_DETECTOR - select HARDLOCKUP_DETECTOR_NON_ARCH if HAVE_HARDLOCKUP_DETECTOR_NON_ARCH help Say Y here to enable the kernel to act as a watchdog to detect @@ -1055,9 +1072,14 @@ config HARDLOCKUP_DETECTOR chance to run. The current stack trace is displayed upon detection and the system will stay locked up. +# +# Note that arch-specific variants are always preferred. +# config HARDLOCKUP_DETECTOR_PREFER_BUDDY bool "Prefer the buddy CPU hardlockup detector" - depends on HAVE_HARDLOCKUP_DETECTOR_PERF && SMP + depends on HARDLOCKUP_DETECTOR + depends on HAVE_HARDLOCKUP_DETECTOR_PERF && HAVE_HARDLOCKUP_DETECTOR_BUDDY + depends on !HAVE_NMI_WATCHDOG help Say Y here to prefer the buddy hardlockup detector over the perf one. @@ -1071,39 +1093,27 @@ config HARDLOCKUP_DETECTOR_PREFER_BUDDY config HARDLOCKUP_DETECTOR_PERF bool - depends on HAVE_HARDLOCKUP_DETECTOR_PERF + depends on HARDLOCKUP_DETECTOR + depends on HAVE_HARDLOCKUP_DETECTOR_PERF && !HARDLOCKUP_DETECTOR_PREFER_BUDDY + depends on !HAVE_NMI_WATCHDOG select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER config HARDLOCKUP_DETECTOR_BUDDY bool - depends on SMP + depends on HARDLOCKUP_DETECTOR + depends on HAVE_HARDLOCKUP_DETECTOR_BUDDY + depends on !HAVE_HARDLOCKUP_DETECTOR_PERF || HARDLOCKUP_DETECTOR_PREFER_BUDDY + depends on !HAVE_NMI_WATCHDOG select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER +# # Both the "perf" and "buddy" hardlockup detectors count hrtimer # interrupts. This config enables functions managing this common code. +# config HARDLOCKUP_DETECTOR_COUNTS_HRTIMER bool select SOFTLOCKUP_DETECTOR -# For hardlockup detectors you can have one directly provided by the arch -# or use a "non-arch" one. If you're using a "non-arch" one that is -# further divided the perf hardlockup detector (which, confusingly, needs -# arch-provided perf support) and the buddy hardlockup detector (which just -# needs SMP). In either case, using the "non-arch" code conflicts with -# the NMI watchdog code (which is sometimes used directly and sometimes used -# by the arch-provided hardlockup detector). -config HAVE_HARDLOCKUP_DETECTOR_NON_ARCH - bool - depends on (HAVE_HARDLOCKUP_DETECTOR_PERF || SMP) && !HAVE_NMI_WATCHDOG - default y - -# This will select the appropriate non-arch hardlockdup detector -config HARDLOCKUP_DETECTOR_NON_ARCH - bool - depends on HAVE_HARDLOCKUP_DETECTOR_NON_ARCH - select HARDLOCKUP_DETECTOR_BUDDY if !HAVE_HARDLOCKUP_DETECTOR_PERF || HARDLOCKUP_DETECTOR_PREFER_BUDDY - select HARDLOCKUP_DETECTOR_PERF if HAVE_HARDLOCKUP_DETECTOR_PERF && !HARDLOCKUP_DETECTOR_PREFER_BUDDY - # # Enables a timestamp based low pass filter to compensate for perf based # hard lockup detection which runs too fast due to turbo modes. |