diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 23 | ||||
| -rw-r--r-- | lib/strncpy_from_user.c | 2 |
2 files changed, 24 insertions, 1 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 8c15b29d5adc..63d14d9b51d8 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -707,15 +707,27 @@ config LOCKUP_DETECTOR 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. + If NMIs are not available on the platform, every 12 seconds the + hrtimer interrupt on one cpu will be used to check for hardlockups + on the next cpu. The frequency of hrtimer and NMI events and the soft and hard lockup thresholds can be controlled through the sysctl watchdog_thresh. -config HARDLOCKUP_DETECTOR +config HARDLOCKUP_DETECTOR_NMI def_bool y depends on LOCKUP_DETECTOR && !HAVE_NMI_WATCHDOG depends on PERF_EVENTS && HAVE_PERF_EVENTS_NMI +config HARDLOCKUP_DETECTOR_OTHER_CPU + def_bool y + depends on LOCKUP_DETECTOR && SMP + depends on !HARDLOCKUP_DETECTOR_NMI && !HAVE_NMI_WATCHDOG + +config HARDLOCKUP_DETECTOR + def_bool y + depends on HARDLOCKUP_DETECTOR_NMI || HARDLOCKUP_DETECTOR_OTHER_CPU + config BOOTPARAM_HARDLOCKUP_PANIC bool "Panic (Reboot) On Hard Lockups" depends on HARDLOCKUP_DETECTOR @@ -855,6 +867,15 @@ config SCHED_INFO bool default n +config PANIC_ON_RT_THROTTLING + bool "Panic on RT throttling" + help + Say Y here to enable the kernel to panic when a realtime + runqueue is throttled. This may be useful for detecting + and debugging RT throttling issues. + + Say N if unsure. + config SCHEDSTATS bool "Collect scheduler statistics" depends on DEBUG_KERNEL && PROC_FS diff --git a/lib/strncpy_from_user.c b/lib/strncpy_from_user.c index 5a003a2ebd96..05efc1fa97f0 100644 --- a/lib/strncpy_from_user.c +++ b/lib/strncpy_from_user.c @@ -1,5 +1,6 @@ #include <linux/compiler.h> #include <linux/export.h> +#include <linux/thread_info.h> #include <linux/uaccess.h> #include <linux/kernel.h> #include <linux/errno.h> @@ -109,6 +110,7 @@ long strncpy_from_user(char *dst, const char __user *src, long count) unsigned long max = max_addr - src_addr; long retval; + check_object_size(dst, count, false); user_access_begin(); retval = do_strncpy_from_user(dst, src, count, max); user_access_end(); |