Merge branch 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
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
This commit is contained in:
Linus Torvalds
Коммит
ab5318788c
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|
@ -33,6 +33,10 @@ show up in /proc/sys/kernel:
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|||
- domainname
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- hostname
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||||
- hotplug
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- hung_task_panic
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- hung_task_check_count
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||||
- hung_task_timeout_secs
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||||
- hung_task_warnings
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||||
- kexec_load_disabled
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- kptr_restrict
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- kstack_depth_to_print [ X86 only ]
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|
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@ -288,6 +292,44 @@ Default value is "/sbin/hotplug".
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|||
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||||
==============================================================
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hung_task_panic:
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||||
Controls the kernel's behavior when a hung task is detected.
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This file shows up if CONFIG_DETECT_HUNG_TASK is enabled.
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0: continue operation. This is the default behavior.
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||||
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||||
1: panic immediately.
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||||
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||||
==============================================================
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hung_task_check_count:
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The upper bound on the number of tasks that are checked.
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This file shows up if CONFIG_DETECT_HUNG_TASK is enabled.
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||||
==============================================================
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hung_task_timeout_secs:
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Check interval. When a task in D state did not get scheduled
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for more than this value report a warning.
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||||
This file shows up if CONFIG_DETECT_HUNG_TASK is enabled.
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0: means infinite timeout - no checking done.
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==============================================================
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hung_task_warning:
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The maximum number of warnings to report. During a check interval
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When this value is reached, no more the warnings will be reported.
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This file shows up if CONFIG_DETECT_HUNG_TASK is enabled.
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-1: report an infinite number of warnings.
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==============================================================
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kexec_load_disabled:
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||||
|
||||
A toggle indicating if the kexec_load syscall has been disabled. This
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|
|
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13
MAINTAINERS
13
MAINTAINERS
|
|
@ -2222,6 +2222,7 @@ F: include/linux/clk.h
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CLOCKSOURCE, CLOCKEVENT DRIVERS
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M: Daniel Lezcano <daniel.lezcano@linaro.org>
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M: Thomas Gleixner <tglx@linutronix.de>
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L: linux-kernel@vger.kernel.org
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core
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S: Supported
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F: drivers/clocksource
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|
|
@ -4023,6 +4024,7 @@ F: include/uapi/linux/hid*
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|||
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HIGH-RESOLUTION TIMERS, CLOCKEVENTS, DYNTICKS
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M: Thomas Gleixner <tglx@linutronix.de>
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L: linux-kernel@vger.kernel.org
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||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core
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||||
S: Maintained
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||||
F: Documentation/timers/
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||||
|
|
@ -4694,6 +4696,7 @@ F: net/irda/
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|||
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IRQ SUBSYSTEM
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||||
M: Thomas Gleixner <tglx@linutronix.de>
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L: linux-kernel@vger.kernel.org
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S: Maintained
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git irq/core
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F: kernel/irq/
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|
|
@ -5325,6 +5328,7 @@ F: drivers/media/usb/dvb-usb-v2/lmedm04*
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LOCKDEP AND LOCKSTAT
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M: Peter Zijlstra <peterz@infradead.org>
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M: Ingo Molnar <mingo@redhat.com>
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L: linux-kernel@vger.kernel.org
|
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T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/locking
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S: Maintained
|
||||
F: Documentation/lockdep*.txt
|
||||
|
|
@ -6622,6 +6626,7 @@ M: Peter Zijlstra <a.p.zijlstra@chello.nl>
|
|||
M: Paul Mackerras <paulus@samba.org>
|
||||
M: Ingo Molnar <mingo@redhat.com>
|
||||
M: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
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||||
L: linux-kernel@vger.kernel.org
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf/core
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||||
S: Supported
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||||
F: kernel/events/*
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||||
|
|
@ -6745,6 +6750,7 @@ F: drivers/scsi/pm8001/
|
|||
|
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POSIX CLOCKS and TIMERS
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||||
M: Thomas Gleixner <tglx@linutronix.de>
|
||||
L: linux-kernel@vger.kernel.org
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core
|
||||
S: Supported
|
||||
F: fs/timerfd.c
|
||||
|
|
@ -7153,6 +7159,7 @@ F: drivers/net/wireless/ray*
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RCUTORTURE MODULE
|
||||
M: Josh Triplett <josh@freedesktop.org>
|
||||
M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
|
||||
L: linux-kernel@vger.kernel.org
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||||
S: Supported
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
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||||
F: Documentation/RCU/torture.txt
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|
|
@ -7160,6 +7167,7 @@ F: kernel/rcu/torture.c
|
|||
|
||||
RCUTORTURE TEST FRAMEWORK
|
||||
M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
|
||||
L: linux-kernel@vger.kernel.org
|
||||
S: Supported
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
|
||||
F: tools/testing/selftests/rcutorture
|
||||
|
|
@ -7183,6 +7191,7 @@ F: net/rds/
|
|||
READ-COPY UPDATE (RCU)
|
||||
M: Dipankar Sarma <dipankar@in.ibm.com>
|
||||
M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
|
||||
L: linux-kernel@vger.kernel.org
|
||||
W: http://www.rdrop.com/users/paulmck/RCU/
|
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S: Supported
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||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
|
||||
|
|
@ -7492,6 +7501,7 @@ F: drivers/mmc/host/dw_mmc*
|
|||
TIMEKEEPING, CLOCKSOURCE CORE, NTP
|
||||
M: John Stultz <john.stultz@linaro.org>
|
||||
M: Thomas Gleixner <tglx@linutronix.de>
|
||||
L: linux-kernel@vger.kernel.org
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core
|
||||
S: Supported
|
||||
F: include/linux/clocksource.h
|
||||
|
|
@ -7517,6 +7527,7 @@ F: drivers/watchdog/sc1200wdt.c
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|||
SCHEDULER
|
||||
M: Ingo Molnar <mingo@redhat.com>
|
||||
M: Peter Zijlstra <peterz@infradead.org>
|
||||
L: linux-kernel@vger.kernel.org
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git sched/core
|
||||
S: Maintained
|
||||
F: kernel/sched/
|
||||
|
|
@ -7884,6 +7895,7 @@ F: mm/sl?b.c
|
|||
SLEEPABLE READ-COPY UPDATE (SRCU)
|
||||
M: Lai Jiangshan <laijs@cn.fujitsu.com>
|
||||
M: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
|
||||
L: linux-kernel@vger.kernel.org
|
||||
W: http://www.rdrop.com/users/paulmck/RCU/
|
||||
S: Supported
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
|
||||
|
|
@ -9587,6 +9599,7 @@ M: Thomas Gleixner <tglx@linutronix.de>
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|||
M: Ingo Molnar <mingo@redhat.com>
|
||||
M: "H. Peter Anvin" <hpa@zytor.com>
|
||||
M: x86@kernel.org
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||||
L: linux-kernel@vger.kernel.org
|
||||
T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git x86/core
|
||||
S: Maintained
|
||||
F: Documentation/x86/
|
||||
|
|
|
|||
|
|
@ -12,7 +12,6 @@ extern enum uv_system_type get_uv_system_type(void);
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extern int is_uv_system(void);
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extern void uv_cpu_init(void);
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extern void uv_nmi_init(void);
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extern void uv_register_nmi_notifier(void);
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extern void uv_system_init(void);
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extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask,
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struct mm_struct *mm,
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|
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@ -26,7 +25,6 @@ static inline enum uv_system_type get_uv_system_type(void) { return UV_NONE; }
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static inline int is_uv_system(void) { return 0; }
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static inline void uv_cpu_init(void) { }
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static inline void uv_system_init(void) { }
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static inline void uv_register_nmi_notifier(void) { }
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static inline const struct cpumask *
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uv_flush_tlb_others(const struct cpumask *cpumask, struct mm_struct *mm,
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unsigned long start, unsigned long end, unsigned int cpu)
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|
|
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|
|
@ -980,7 +980,6 @@ void __init uv_system_init(void)
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uv_nmi_setup();
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uv_cpu_init();
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uv_scir_register_cpu_notifier();
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uv_register_nmi_notifier();
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proc_mkdir("sgi_uv", NULL);
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/* register Legacy VGA I/O redirection handler */
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|
|
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@ -74,7 +74,6 @@ static atomic_t uv_in_nmi;
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static atomic_t uv_nmi_cpu = ATOMIC_INIT(-1);
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static atomic_t uv_nmi_cpus_in_nmi = ATOMIC_INIT(-1);
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static atomic_t uv_nmi_slave_continue;
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static atomic_t uv_nmi_kexec_failed;
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static cpumask_var_t uv_nmi_cpu_mask;
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/* Values for uv_nmi_slave_continue */
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|
|
@ -149,7 +148,8 @@ module_param_named(retry_count, uv_nmi_retry_count, int, 0644);
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* "dump" - dump process stack for each cpu
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* "ips" - dump IP info for each cpu
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* "kdump" - do crash dump
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* "kdb" - enter KDB/KGDB (default)
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* "kdb" - enter KDB (default)
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* "kgdb" - enter KGDB
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*/
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static char uv_nmi_action[8] = "kdb";
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module_param_string(action, uv_nmi_action, sizeof(uv_nmi_action), 0644);
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|
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@ -504,6 +504,7 @@ static void uv_nmi_touch_watchdogs(void)
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}
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#if defined(CONFIG_KEXEC)
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static atomic_t uv_nmi_kexec_failed;
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static void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
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{
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/* Call crash to dump system state */
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|
|
@ -537,18 +538,45 @@ static inline void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs)
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}
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#endif /* !CONFIG_KEXEC */
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|
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#ifdef CONFIG_KGDB
|
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#ifdef CONFIG_KGDB_KDB
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/* Call KDB from NMI handler */
|
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static void uv_call_kdb(int cpu, struct pt_regs *regs, int master)
|
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static inline int uv_nmi_kdb_reason(void)
|
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{
|
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int ret;
|
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return KDB_REASON_SYSTEM_NMI;
|
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}
|
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#else /* !CONFIG_KGDB_KDB */
|
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static inline int uv_nmi_kdb_reason(void)
|
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{
|
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/* Insure user is expecting to attach gdb remote */
|
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if (uv_nmi_action_is("kgdb"))
|
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return 0;
|
||||
|
||||
pr_err("UV: NMI error: KDB is not enabled in this kernel\n");
|
||||
return -1;
|
||||
}
|
||||
#endif /* CONFIG_KGDB_KDB */
|
||||
|
||||
/*
|
||||
* Call KGDB/KDB from NMI handler
|
||||
*
|
||||
* Note that if both KGDB and KDB are configured, then the action of 'kgdb' or
|
||||
* 'kdb' has no affect on which is used. See the KGDB documention for further
|
||||
* information.
|
||||
*/
|
||||
static void uv_call_kgdb_kdb(int cpu, struct pt_regs *regs, int master)
|
||||
{
|
||||
if (master) {
|
||||
int reason = uv_nmi_kdb_reason();
|
||||
int ret;
|
||||
|
||||
if (reason < 0)
|
||||
return;
|
||||
|
||||
/* call KGDB NMI handler as MASTER */
|
||||
ret = kgdb_nmicallin(cpu, X86_TRAP_NMI, regs,
|
||||
&uv_nmi_slave_continue);
|
||||
ret = kgdb_nmicallin(cpu, X86_TRAP_NMI, regs, reason,
|
||||
&uv_nmi_slave_continue);
|
||||
if (ret) {
|
||||
pr_alert("KDB returned error, is kgdboc set?\n");
|
||||
pr_alert("KGDB returned error, is kgdboc set?\n");
|
||||
atomic_set(&uv_nmi_slave_continue, SLAVE_EXIT);
|
||||
}
|
||||
} else {
|
||||
|
|
@ -567,12 +595,12 @@ static void uv_call_kdb(int cpu, struct pt_regs *regs, int master)
|
|||
uv_nmi_sync_exit(master);
|
||||
}
|
||||
|
||||
#else /* !CONFIG_KGDB_KDB */
|
||||
static inline void uv_call_kdb(int cpu, struct pt_regs *regs, int master)
|
||||
#else /* !CONFIG_KGDB */
|
||||
static inline void uv_call_kgdb_kdb(int cpu, struct pt_regs *regs, int master)
|
||||
{
|
||||
pr_err("UV: NMI error: KGDB/KDB is not enabled in this kernel\n");
|
||||
pr_err("UV: NMI error: KGDB is not enabled in this kernel\n");
|
||||
}
|
||||
#endif /* !CONFIG_KGDB_KDB */
|
||||
#endif /* !CONFIG_KGDB */
|
||||
|
||||
/*
|
||||
* UV NMI handler
|
||||
|
|
@ -606,9 +634,9 @@ int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)
|
|||
if (uv_nmi_action_is("ips") || uv_nmi_action_is("dump"))
|
||||
uv_nmi_dump_state(cpu, regs, master);
|
||||
|
||||
/* Call KDB if enabled */
|
||||
else if (uv_nmi_action_is("kdb"))
|
||||
uv_call_kdb(cpu, regs, master);
|
||||
/* Call KGDB/KDB if enabled */
|
||||
else if (uv_nmi_action_is("kdb") || uv_nmi_action_is("kgdb"))
|
||||
uv_call_kgdb_kdb(cpu, regs, master);
|
||||
|
||||
/* Clear per_cpu "in nmi" flag */
|
||||
atomic_set(&uv_cpu_nmi.state, UV_NMI_STATE_OUT);
|
||||
|
|
@ -634,7 +662,7 @@ int uv_handle_nmi(unsigned int reason, struct pt_regs *regs)
|
|||
/*
|
||||
* NMI handler for pulling in CPUs when perf events are grabbing our NMI
|
||||
*/
|
||||
int uv_handle_nmi_ping(unsigned int reason, struct pt_regs *regs)
|
||||
static int uv_handle_nmi_ping(unsigned int reason, struct pt_regs *regs)
|
||||
{
|
||||
int ret;
|
||||
|
||||
|
|
@ -651,7 +679,7 @@ int uv_handle_nmi_ping(unsigned int reason, struct pt_regs *regs)
|
|||
return ret;
|
||||
}
|
||||
|
||||
void uv_register_nmi_notifier(void)
|
||||
static void uv_register_nmi_notifier(void)
|
||||
{
|
||||
if (register_nmi_handler(NMI_UNKNOWN, uv_handle_nmi, 0, "uv"))
|
||||
pr_warn("UV: NMI handler failed to register\n");
|
||||
|
|
@ -695,6 +723,5 @@ void uv_nmi_setup(void)
|
|||
uv_hub_nmi_per(cpu) = uv_hub_nmi_list[nid];
|
||||
}
|
||||
BUG_ON(!alloc_cpumask_var(&uv_nmi_cpu_mask, GFP_KERNEL));
|
||||
uv_register_nmi_notifier();
|
||||
}
|
||||
|
||||
|
||||
|
|
|
|||
|
|
@ -310,7 +310,8 @@ extern int
|
|||
kgdb_handle_exception(int ex_vector, int signo, int err_code,
|
||||
struct pt_regs *regs);
|
||||
extern int kgdb_nmicallback(int cpu, void *regs);
|
||||
extern int kgdb_nmicallin(int cpu, int trapnr, void *regs, atomic_t *snd_rdy);
|
||||
extern int kgdb_nmicallin(int cpu, int trapnr, void *regs, int err_code,
|
||||
atomic_t *snd_rdy);
|
||||
extern void gdbstub_exit(int status);
|
||||
|
||||
extern int kgdb_single_step;
|
||||
|
|
|
|||
|
|
@ -5,7 +5,7 @@
|
|||
extern int sysctl_hung_task_check_count;
|
||||
extern unsigned int sysctl_hung_task_panic;
|
||||
extern unsigned long sysctl_hung_task_timeout_secs;
|
||||
extern unsigned long sysctl_hung_task_warnings;
|
||||
extern int sysctl_hung_task_warnings;
|
||||
extern int proc_dohung_task_timeout_secs(struct ctl_table *table, int write,
|
||||
void __user *buffer,
|
||||
size_t *lenp, loff_t *ppos);
|
||||
|
|
|
|||
|
|
@ -736,7 +736,8 @@ int kgdb_nmicallback(int cpu, void *regs)
|
|||
return 1;
|
||||
}
|
||||
|
||||
int kgdb_nmicallin(int cpu, int trapnr, void *regs, atomic_t *send_ready)
|
||||
int kgdb_nmicallin(int cpu, int trapnr, void *regs, int err_code,
|
||||
atomic_t *send_ready)
|
||||
{
|
||||
#ifdef CONFIG_SMP
|
||||
if (!kgdb_io_ready(0) || !send_ready)
|
||||
|
|
@ -750,7 +751,7 @@ int kgdb_nmicallin(int cpu, int trapnr, void *regs, atomic_t *send_ready)
|
|||
ks->cpu = cpu;
|
||||
ks->ex_vector = trapnr;
|
||||
ks->signo = SIGTRAP;
|
||||
ks->err_code = KGDB_KDB_REASON_SYSTEM_NMI;
|
||||
ks->err_code = err_code;
|
||||
ks->linux_regs = regs;
|
||||
ks->send_ready = send_ready;
|
||||
kgdb_cpu_enter(ks, regs, DCPU_WANT_MASTER);
|
||||
|
|
|
|||
|
|
@ -75,13 +75,11 @@ extern int kdb_stub(struct kgdb_state *ks);
|
|||
extern int kdb_parse(const char *cmdstr);
|
||||
extern int kdb_common_init_state(struct kgdb_state *ks);
|
||||
extern int kdb_common_deinit_state(void);
|
||||
#define KGDB_KDB_REASON_SYSTEM_NMI KDB_REASON_SYSTEM_NMI
|
||||
#else /* ! CONFIG_KGDB_KDB */
|
||||
static inline int kdb_stub(struct kgdb_state *ks)
|
||||
{
|
||||
return DBG_PASS_EVENT;
|
||||
}
|
||||
#define KGDB_KDB_REASON_SYSTEM_NMI 0
|
||||
#endif /* CONFIG_KGDB_KDB */
|
||||
|
||||
#endif /* _DEBUG_CORE_H_ */
|
||||
|
|
|
|||
|
|
@ -37,7 +37,7 @@ int __read_mostly sysctl_hung_task_check_count = PID_MAX_LIMIT;
|
|||
*/
|
||||
unsigned long __read_mostly sysctl_hung_task_timeout_secs = CONFIG_DEFAULT_HUNG_TASK_TIMEOUT;
|
||||
|
||||
unsigned long __read_mostly sysctl_hung_task_warnings = 10;
|
||||
int __read_mostly sysctl_hung_task_warnings = 10;
|
||||
|
||||
static int __read_mostly did_panic;
|
||||
|
||||
|
|
@ -98,7 +98,9 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
|
|||
|
||||
if (!sysctl_hung_task_warnings)
|
||||
return;
|
||||
sysctl_hung_task_warnings--;
|
||||
|
||||
if (sysctl_hung_task_warnings > 0)
|
||||
sysctl_hung_task_warnings--;
|
||||
|
||||
/*
|
||||
* Ok, the task did not get scheduled for more than 2 minutes,
|
||||
|
|
|
|||
|
|
@ -121,6 +121,8 @@ extern int blk_iopoll_enabled;
|
|||
static int sixty = 60;
|
||||
#endif
|
||||
|
||||
static int __maybe_unused neg_one = -1;
|
||||
|
||||
static int zero;
|
||||
static int __maybe_unused one = 1;
|
||||
static int __maybe_unused two = 2;
|
||||
|
|
@ -997,9 +999,10 @@ static struct ctl_table kern_table[] = {
|
|||
{
|
||||
.procname = "hung_task_warnings",
|
||||
.data = &sysctl_hung_task_warnings,
|
||||
.maxlen = sizeof(unsigned long),
|
||||
.maxlen = sizeof(int),
|
||||
.mode = 0644,
|
||||
.proc_handler = proc_doulongvec_minmax,
|
||||
.proc_handler = proc_dointvec_minmax,
|
||||
.extra1 = &neg_one,
|
||||
},
|
||||
#endif
|
||||
#ifdef CONFIG_COMPAT
|
||||
|
|
|
|||
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