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authorLinus Torvalds <torvalds@linux-foundation.org>2023-06-28 20:59:38 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2023-06-28 20:59:38 +0300
commit77b1a7f7a05c673c187894b4ae898a8c0cdc776c (patch)
treee5f86addd81715393efcc7e3ba07cd68de31adf4 /lib/Kconfig.debug
parent6e17c6de3ddf3073741d9c91a796ee696914d8a0 (diff)
parent4afc9a402aa3890885747b396c1adcd45f127665 (diff)
downloadlinux-77b1a7f7a05c673c187894b4ae898a8c0cdc776c.tar.xz
Merge tag 'mm-nonmm-stable-2023-06-24-19-23' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull non-mm updates from Andrew Morton: - Arnd Bergmann has fixed a bunch of -Wmissing-prototypes in top-level directories - Douglas Anderson has added a new "buddy" mode to the hardlockup detector. It permits the detector to work on architectures which cannot provide the required interrupts, by having CPUs periodically perform checks on other CPUs - Zhen Lei has enhanced kexec's ability to support two crash regions - Petr Mladek has done a lot of cleanup on the hard lockup detector's Kconfig entries - And the usual bunch of singleton patches in various places * tag 'mm-nonmm-stable-2023-06-24-19-23' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: (72 commits) kernel/time/posix-stubs.c: remove duplicated include ocfs2: remove redundant assignment to variable bit_off watchdog/hardlockup: fix typo in config HARDLOCKUP_DETECTOR_PREFER_BUDDY powerpc: move arch_trigger_cpumask_backtrace from nmi.h to irq.h devres: show which resource was invalid in __devm_ioremap_resource() watchdog/hardlockup: define HARDLOCKUP_DETECTOR_ARCH watchdog/sparc64: define HARDLOCKUP_DETECTOR_SPARC64 watchdog/hardlockup: make HAVE_NMI_WATCHDOG sparc64-specific watchdog/hardlockup: declare arch_touch_nmi_watchdog() only in linux/nmi.h watchdog/hardlockup: make the config checks more straightforward watchdog/hardlockup: sort hardlockup detector related config values a logical way watchdog/hardlockup: move SMP barriers from common code to buddy code watchdog/buddy: simplify the dependency for HARDLOCKUP_DETECTOR_PREFER_BUDDY watchdog/buddy: don't copy the cpumask in watchdog_next_cpu() watchdog/buddy: cleanup how watchdog_buddy_check_hardlockup() is called watchdog/hardlockup: remove softlockup comment in touch_nmi_watchdog() watchdog/hardlockup: in watchdog_hardlockup_check() use cpumask_copy() watchdog/hardlockup: don't use raw_cpu_ptr() in watchdog_hardlockup_kick() watchdog/hardlockup: HAVE_NMI_WATCHDOG must implement watchdog_hardlockup_probe() watchdog/hardlockup: keep kernel.nmi_watchdog sysctl as 0444 if probe fails ...
Diffstat (limited to 'lib/Kconfig.debug')
-rw-r--r--lib/Kconfig.debug84
1 files changed, 72 insertions, 12 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 376784ad3545..781f061ec0fa 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -1035,27 +1035,30 @@ config BOOTPARAM_SOFTLOCKUP_PANIC
Say N if unsure.
-config HARDLOCKUP_DETECTOR_PERF
+config HAVE_HARDLOCKUP_DETECTOR_BUDDY
bool
- select SOFTLOCKUP_DETECTOR
+ depends on SMP
+ default y
#
-# Enables a timestamp based low pass filter to compensate for perf based
-# hard lockup detection which runs too fast due to turbo modes.
+# 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:
#
-config HARDLOCKUP_CHECK_TIMESTAMP
- bool
-
+# s390: it reported many false positives there
#
-# arch/ can define HAVE_HARDLOCKUP_DETECTOR_ARCH to provide their own hard
-# lockup detector rather than the perf based detector.
+# sparc64: has a custom implementation which is not using the common
+# hardlockup command line options and sysctl interface.
#
config HARDLOCKUP_DETECTOR
bool "Detect Hard Lockups"
- depends on DEBUG_KERNEL && !S390
- depends on HAVE_HARDLOCKUP_DETECTOR_PERF || HAVE_HARDLOCKUP_DETECTOR_ARCH
+ depends on DEBUG_KERNEL && !S390 && !HARDLOCKUP_DETECTOR_SPARC64
+ depends on HAVE_HARDLOCKUP_DETECTOR_PERF || HAVE_HARDLOCKUP_DETECTOR_BUDDY || HAVE_HARDLOCKUP_DETECTOR_ARCH
+ imply HARDLOCKUP_DETECTOR_PERF
+ imply HARDLOCKUP_DETECTOR_BUDDY
+ imply HARDLOCKUP_DETECTOR_ARCH
select LOCKUP_DETECTOR
- select HARDLOCKUP_DETECTOR_PERF if HAVE_HARDLOCKUP_DETECTOR_PERF
+
help
Say Y here to enable the kernel to act as a watchdog to detect
hard lockups.
@@ -1065,6 +1068,63 @@ 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 HARDLOCKUP_DETECTOR
+ depends on HAVE_HARDLOCKUP_DETECTOR_PERF && HAVE_HARDLOCKUP_DETECTOR_BUDDY
+ depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH
+ help
+ Say Y here to prefer the buddy hardlockup detector over the perf one.
+
+ With the buddy detector, each CPU uses its softlockup hrtimer
+ to check that the next CPU is processing hrtimer interrupts by
+ verifying that a counter is increasing.
+
+ This hardlockup detector is useful on systems that don't have
+ an arch-specific hardlockup detector or if resources needed
+ for the hardlockup detector are better used for other things.
+
+config HARDLOCKUP_DETECTOR_PERF
+ bool
+ depends on HARDLOCKUP_DETECTOR
+ depends on HAVE_HARDLOCKUP_DETECTOR_PERF && !HARDLOCKUP_DETECTOR_PREFER_BUDDY
+ depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH
+ select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER
+
+config HARDLOCKUP_DETECTOR_BUDDY
+ bool
+ depends on HARDLOCKUP_DETECTOR
+ depends on HAVE_HARDLOCKUP_DETECTOR_BUDDY
+ depends on !HAVE_HARDLOCKUP_DETECTOR_PERF || HARDLOCKUP_DETECTOR_PREFER_BUDDY
+ depends on !HAVE_HARDLOCKUP_DETECTOR_ARCH
+ select HARDLOCKUP_DETECTOR_COUNTS_HRTIMER
+
+config HARDLOCKUP_DETECTOR_ARCH
+ bool
+ depends on HARDLOCKUP_DETECTOR
+ depends on HAVE_HARDLOCKUP_DETECTOR_ARCH
+ help
+ The arch-specific implementation of the hardlockup detector will
+ be used.
+
+#
+# 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
+
+#
+# Enables a timestamp based low pass filter to compensate for perf based
+# hard lockup detection which runs too fast due to turbo modes.
+#
+config HARDLOCKUP_CHECK_TIMESTAMP
+ bool
+
config BOOTPARAM_HARDLOCKUP_PANIC
bool "Panic (Reboot) On Hard Lockups"
depends on HARDLOCKUP_DETECTOR