Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel...

Pull core debug changes from Ingo Molnar:
 "This contains mostly kernel debugging related updates:

   - make hung_task detection more configurable to distros
   - add final bits for x86 UV NMI debugging, with related KGDB changes
   - update the mailing-list of MAINTAINERS entries I'm involved with"

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  hung_task: Display every hung task warning
  sysctl: Add neg_one as a standard constraint
  x86/uv/nmi, kgdb/kdb: Fix UV NMI handler when KDB not configured
  x86/uv/nmi: Fix Sparse warnings
  kgdb/kdb: Fix no KDB config problem
  MAINTAINERS: Restore "L: linux-kernel@vger.kernel.org" entries

diff --cc Documentation/sysctl/kernel.txt
index ee9a2f983b9901d74266f9bfa9c1a2da68c49450,4205f3c05cbe1eee55d823773741bd381e3ba6e0..e55124e7c40cd0eef8afb92c34913cd68c42faac
--- 1/Documentation/sysctl/kernel.txt
--- 2/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@@ -33,7 -33,10 +33,11 @@@ show up in /proc/sys/kernel
  - domainname
  - hostname
  - hotplug
+ - hung_task_panic
+ - hung_task_check_count
+ - hung_task_timeout_secs
+ - hung_task_warnings
 +- kexec_load_disabled
  - kptr_restrict
  - kstack_depth_to_print       [ X86 only ]
  - l2cr                        [ PPC only ]
@@@ -288,18 -291,44 +292,56 @@@ Default value is "/sbin/hotplug"
  
  ==============================================================
  
+ hung_task_panic:
+ 
+ Controls the kernel's behavior when a hung task is detected.
+ This file shows up if CONFIG_DETECT_HUNG_TASK is enabled.
+ 
+ 0: continue operation. This is the default behavior.
+ 
+ 1: panic immediately.
+ 
+ ==============================================================
+ 
+ hung_task_check_count:
+ 
+ The upper bound on the number of tasks that are checked.
+ This file shows up if CONFIG_DETECT_HUNG_TASK is enabled.
+ 
+ ==============================================================
+ 
+ hung_task_timeout_secs:
+ 
+ Check interval. When a task in D state did not get scheduled
+ for more than this value report a warning.
+ This file shows up if CONFIG_DETECT_HUNG_TASK is enabled.
+ 
+ 0: means infinite timeout - no checking done.
+ 
+ ==============================================================
+ 
+ hung_task_warning:
+ 
+ The maximum number of warnings to report. During a check interval
+ When this value is reached, no more the warnings will be reported.
+ This file shows up if CONFIG_DETECT_HUNG_TASK is enabled.
+ 
+ -1: report an infinite number of warnings.
+ 
+ ==============================================================
+ 
 +kexec_load_disabled:
 +
 +A toggle indicating if the kexec_load syscall has been disabled. This
 +value defaults to 0 (false: kexec_load enabled), but can be set to 1
 +(true: kexec_load disabled). Once true, kexec can no longer be used, and
 +the toggle cannot be set back to false. This allows a kexec image to be
 +loaded before disabling the syscall, allowing a system to set up (and
 +later use) an image without it being altered. Generally used together
 +with the "modules_disabled" sysctl.
 +
 +==============================================================
 +
  kptr_restrict:
  
  This toggle indicates whether restrictions are placed on

diff --cc MAINTAINERS
Simple merge

diff --cc include/linux/sched/sysctl.h
Simple merge

diff --cc kernel/sysctl.c
Simple merge