From 981c3a4ff8596a9dcd2b058ee12d6749639c32a5 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Tue, 21 Jan 2014 10:59:20 +0100 Subject: MAINTAINERS: Restore "L: linux-kernel@vger.kernel.org" entries A couple of years ago all the "L: lkml" email list entries in MAINTAINERS were removed and replaced with a 'the rest' entry at the end of the file - under the theory that this is unnecessary duplication and that people would find it intuitive: b5472cddbe2c MAINTAINERS: remove L: linux-kernel@vger.kernel.org from all but "THE REST" So it turns out that it's all but intuitive, not all people use scripts/get_maintainer.pl to extract maintainer contact info, some people read the MAINTAINERS file and see the lack of 'L:' entries of various lkml-only subsystems and are sending patches to the maintainers only, without Cc:-ing lkml. They arguably have a point. In hindsight removing all the "L: lkml" entries was probably not an overly good idea, not all mechanic duplication should be eliminated: in files read by humans it's useful to have 'at a glance' summary for all email addresses important to a subsystem's maintenance, in a single place, without too many imported rules and assumptions. So, to make the lkml fallback really apparent, add back 'L: lkml' entries to all subsystem entries whose workflow I'm involved in. This should at minimum be a per subsystem policy thing. Acked-by: Peter Zijlstra Acked-by: Thomas Gleixner Cc: Linus Torvalds Cc: Andrew Morton Cc: Alan Cox Cc: Joe Perches Cc: "H. Peter Anvin" Cc: Paul E. McKenney Cc: Arnaldo Carvalho de Melo Link: http://lkml.kernel.org/n/tip-lhzlymtgmmv5bMuwsb5zyoYo@git.kernel.org Signed-off-by: Ingo Molnar --- MAINTAINERS | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/MAINTAINERS b/MAINTAINERS index ce1645ebe70c..e048de5ca11b 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -2191,6 +2191,7 @@ F: include/linux/clk.h CLOCKSOURCE, CLOCKEVENT DRIVERS M: Daniel Lezcano M: Thomas Gleixner +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: drivers/clocksource @@ -3985,6 +3986,7 @@ F: include/uapi/linux/hid* HIGH-RESOLUTION TIMERS, CLOCKEVENTS, DYNTICKS M: Thomas Gleixner +L: linux-kernel@vger.kernel.org T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git timers/core S: Maintained F: Documentation/timers/ @@ -4654,6 +4656,7 @@ F: net/irda/ IRQ SUBSYSTEM M: Thomas Gleixner +L: linux-kernel@vger.kernel.org S: Maintained T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git irq/core F: kernel/irq/ @@ -5285,6 +5288,7 @@ F: drivers/media/usb/dvb-usb-v2/lmedm04* LOCKDEP AND LOCKSTAT M: Peter Zijlstra M: Ingo Molnar +L: linux-kernel@vger.kernel.org T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/locking S: Maintained F: Documentation/lockdep*.txt @@ -6581,6 +6585,7 @@ M: Peter Zijlstra M: Paul Mackerras M: Ingo Molnar M: Arnaldo Carvalho de Melo +L: linux-kernel@vger.kernel.org T: git git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git perf/core S: Supported F: kernel/events/* @@ -6704,6 +6709,7 @@ F: drivers/scsi/pm8001/ POSIX CLOCKS and TIMERS M: Thomas Gleixner +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 @@ -7099,6 +7105,7 @@ F: drivers/net/wireless/ray* RCUTORTURE MODULE M: Josh Triplett M: "Paul E. McKenney" +L: linux-kernel@vger.kernel.org S: Supported T: git git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git F: Documentation/RCU/torture.txt @@ -7106,6 +7113,7 @@ F: kernel/rcu/torture.c RCUTORTURE TEST FRAMEWORK M: "Paul E. McKenney" +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 @@ -7129,6 +7137,7 @@ F: net/rds/ READ-COPY UPDATE (RCU) M: Dipankar Sarma M: "Paul E. McKenney" +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 @@ -7432,6 +7441,7 @@ F: drivers/mmc/host/dw_mmc* TIMEKEEPING, CLOCKSOURCE CORE, NTP M: John Stultz M: Thomas Gleixner +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 @@ -7457,6 +7467,7 @@ F: drivers/watchdog/sc1200wdt.c SCHEDULER M: Ingo Molnar M: Peter Zijlstra +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/ @@ -7823,6 +7834,7 @@ F: mm/sl?b.c SLEEPABLE READ-COPY UPDATE (SRCU) M: Lai Jiangshan M: "Paul E. McKenney" +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 @@ -9531,6 +9543,7 @@ M: Thomas Gleixner M: Ingo Molnar M: "H. Peter Anvin" M: x86@kernel.org +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/ -- cgit v1.2.3 From fc8b13740b2978b34872650cc8e928392e3758aa Mon Sep 17 00:00:00 2001 From: Mike Travis Date: Tue, 14 Jan 2014 10:25:52 -0600 Subject: kgdb/kdb: Fix no KDB config problem Some code added to the debug_core module had KDB dependencies that it shouldn't have. Move the KDB dependent REASON back to the caller to remove the dependency in the debug core code. Update the call from the UV NMI handler to conform to the new interface. Signed-off-by: Mike Travis Reviewed-by: Hedi Berriche Cc: Russ Anderson Cc: Jason Wessel Cc: Peter Zijlstra Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Link: http://lkml.kernel.org/r/20140114162551.318251993@asylum.americas.sgi.com Signed-off-by: Ingo Molnar --- arch/x86/platform/uv/uv_nmi.c | 2 +- include/linux/kgdb.h | 3 ++- kernel/debug/debug_core.c | 5 +++-- kernel/debug/debug_core.h | 2 -- 4 files changed, 6 insertions(+), 6 deletions(-) diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c index 8eeccba73130..7486c21cbf0a 100644 --- a/arch/x86/platform/uv/uv_nmi.c +++ b/arch/x86/platform/uv/uv_nmi.c @@ -546,7 +546,7 @@ static void uv_call_kdb(int cpu, struct pt_regs *regs, int master) if (master) { /* call KGDB NMI handler as MASTER */ ret = kgdb_nmicallin(cpu, X86_TRAP_NMI, regs, - &uv_nmi_slave_continue); + KDB_REASON_SYSTEM_NMI, &uv_nmi_slave_continue); if (ret) { pr_alert("KDB returned error, is kgdboc set?\n"); atomic_set(&uv_nmi_slave_continue, SLAVE_EXIT); diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h index dfb4f2ffdaa2..6b06d378f3df 100644 --- a/include/linux/kgdb.h +++ b/include/linux/kgdb.h @@ -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; diff --git a/kernel/debug/debug_core.c b/kernel/debug/debug_core.c index 7d2f35e5df2f..334b3980ffc1 100644 --- a/kernel/debug/debug_core.c +++ b/kernel/debug/debug_core.c @@ -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); diff --git a/kernel/debug/debug_core.h b/kernel/debug/debug_core.h index 572aa4f5677c..127d9bc49fb4 100644 --- a/kernel/debug/debug_core.h +++ b/kernel/debug/debug_core.h @@ -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_ */ -- cgit v1.2.3 From 74c93f9d39b556ff9ac2340d568ad5caf8446c65 Mon Sep 17 00:00:00 2001 From: Mike Travis Date: Tue, 14 Jan 2014 10:25:53 -0600 Subject: x86/uv/nmi: Fix Sparse warnings Make uv_register_nmi_notifier() and uv_handle_nmi_ping() static to address sparse warnings. Fix problem where uv_nmi_kexec_failed is unused when CONFIG_KEXEC is not defined. Signed-off-by: Mike Travis Reviewed-by: Hedi Berriche Cc: Russ Anderson Cc: Jason Wessel Cc: Peter Zijlstra Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Link: http://lkml.kernel.org/r/20140114162551.480872353@asylum.americas.sgi.com Signed-off-by: Ingo Molnar --- arch/x86/include/asm/uv/uv.h | 2 -- arch/x86/kernel/apic/x2apic_uv_x.c | 1 - arch/x86/platform/uv/uv_nmi.c | 9 ++++----- 3 files changed, 4 insertions(+), 8 deletions(-) diff --git a/arch/x86/include/asm/uv/uv.h b/arch/x86/include/asm/uv/uv.h index 6b964a0b86d1..062921ef34e9 100644 --- a/arch/x86/include/asm/uv/uv.h +++ b/arch/x86/include/asm/uv/uv.h @@ -12,7 +12,6 @@ extern enum uv_system_type get_uv_system_type(void); extern int is_uv_system(void); extern void uv_cpu_init(void); extern void uv_nmi_init(void); -extern void uv_register_nmi_notifier(void); extern void uv_system_init(void); extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask, struct mm_struct *mm, @@ -26,7 +25,6 @@ static inline enum uv_system_type get_uv_system_type(void) { return UV_NONE; } static inline int is_uv_system(void) { return 0; } static inline void uv_cpu_init(void) { } static inline void uv_system_init(void) { } -static inline void uv_register_nmi_notifier(void) { } static inline const struct cpumask * uv_flush_tlb_others(const struct cpumask *cpumask, struct mm_struct *mm, unsigned long start, unsigned long end, unsigned int cpu) diff --git a/arch/x86/kernel/apic/x2apic_uv_x.c b/arch/x86/kernel/apic/x2apic_uv_x.c index ad0dc0428baf..d263b1307de1 100644 --- a/arch/x86/kernel/apic/x2apic_uv_x.c +++ b/arch/x86/kernel/apic/x2apic_uv_x.c @@ -980,7 +980,6 @@ void __init uv_system_init(void) uv_nmi_setup(); uv_cpu_init(); uv_scir_register_cpu_notifier(); - uv_register_nmi_notifier(); proc_mkdir("sgi_uv", NULL); /* register Legacy VGA I/O redirection handler */ diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c index 7486c21cbf0a..3a3c425275a0 100644 --- a/arch/x86/platform/uv/uv_nmi.c +++ b/arch/x86/platform/uv/uv_nmi.c @@ -74,7 +74,6 @@ static atomic_t uv_in_nmi; static atomic_t uv_nmi_cpu = ATOMIC_INIT(-1); static atomic_t uv_nmi_cpus_in_nmi = ATOMIC_INIT(-1); static atomic_t uv_nmi_slave_continue; -static atomic_t uv_nmi_kexec_failed; static cpumask_var_t uv_nmi_cpu_mask; /* Values for uv_nmi_slave_continue */ @@ -504,6 +503,7 @@ static void uv_nmi_touch_watchdogs(void) } #if defined(CONFIG_KEXEC) +static atomic_t uv_nmi_kexec_failed; static void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs) { /* Call crash to dump system state */ @@ -634,7 +634,7 @@ 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 +651,7 @@ 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 +695,5 @@ 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(); } - - -- cgit v1.2.3 From 64389998151214c71ba59ac893180744fd880052 Mon Sep 17 00:00:00 2001 From: Mike Travis Date: Tue, 14 Jan 2014 10:25:54 -0600 Subject: x86/uv/nmi, kgdb/kdb: Fix UV NMI handler when KDB not configured Fix UV call into kgdb to depend only on whether KGDB is defined and not both KGDB and KDB. This allows the power nmi command to use the gdb remote connection if enabled. Note new action of 'kgdb' needs to be set as well to indicate user wants to wait for gdb to be connected. If it's set to 'kdb' then an error message is displayed if KDB is not configured. Also note that if both KGDB and KDB are enabled, then the action of 'kgdb' or 'kdb' has no affect on which is used. See the KGDB documentation for further information. Signed-off-by: Mike Travis Reviewed-by: Hedi Berriche Cc: Russ Anderson Cc: Jason Wessel Cc: Peter Zijlstra Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Link: http://lkml.kernel.org/r/20140114162551.635540667@asylum.americas.sgi.com Signed-off-by: Ingo Molnar --- arch/x86/platform/uv/uv_nmi.c | 56 ++++++++++++++++++++++++++++++++----------- 1 file changed, 42 insertions(+), 14 deletions(-) diff --git a/arch/x86/platform/uv/uv_nmi.c b/arch/x86/platform/uv/uv_nmi.c index 3a3c425275a0..be27da60dc8f 100644 --- a/arch/x86/platform/uv/uv_nmi.c +++ b/arch/x86/platform/uv/uv_nmi.c @@ -148,7 +148,8 @@ module_param_named(retry_count, uv_nmi_retry_count, int, 0644); * "dump" - dump process stack for each cpu * "ips" - dump IP info for each cpu * "kdump" - do crash dump - * "kdb" - enter KDB/KGDB (default) + * "kdb" - enter KDB (default) + * "kgdb" - enter KGDB */ static char uv_nmi_action[8] = "kdb"; module_param_string(action, uv_nmi_action, sizeof(uv_nmi_action), 0644); @@ -537,18 +538,45 @@ static inline void uv_nmi_kdump(int cpu, int master, struct pt_regs *regs) } #endif /* !CONFIG_KEXEC */ +#ifdef CONFIG_KGDB #ifdef CONFIG_KGDB_KDB -/* Call KDB from NMI handler */ -static void uv_call_kdb(int cpu, struct pt_regs *regs, int master) +static inline int uv_nmi_kdb_reason(void) { - int ret; + return KDB_REASON_SYSTEM_NMI; +} +#else /* !CONFIG_KGDB_KDB */ +static inline int uv_nmi_kdb_reason(void) +{ + /* Insure user is expecting to attach gdb remote */ + if (uv_nmi_action_is("kgdb")) + 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, - KDB_REASON_SYSTEM_NMI, &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); -- cgit v1.2.3 From 2397efb1bb17595b35f31abb40d95074ebc04f1b Mon Sep 17 00:00:00 2001 From: Aaron Tomlin Date: Mon, 20 Jan 2014 17:34:12 +0000 Subject: sysctl: Add neg_one as a standard constraint Add neg_one to the list of standard constraints - will be used by the next patch. Signed-off-by: Aaron Tomlin Acked-by: Rik van Riel Acked-by: David Rientjes Cc: oleg@redhat.com Link: http://lkml.kernel.org/r/1390239253-24030-2-git-send-email-atomlin@redhat.com Signed-off-by: Ingo Molnar --- kernel/sysctl.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/sysctl.c b/kernel/sysctl.c index c8da99f905cf..c398a58673a7 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -122,6 +122,7 @@ extern int blk_iopoll_enabled; static int sixty = 60; #endif +static int neg_one = -1; static int zero; static int __maybe_unused one = 1; static int __maybe_unused two = 2; -- cgit v1.2.3 From 270750dbc18a71b23d660df110e433ff9616a2d4 Mon Sep 17 00:00:00 2001 From: Aaron Tomlin Date: Mon, 20 Jan 2014 17:34:13 +0000 Subject: hung_task: Display every hung task warning When khungtaskd detects hung tasks, it prints out backtraces from a number of those tasks. Limiting the number of backtraces being printed out can result in the user not seeing the information necessary to debug the issue. The hung_task_warnings sysctl controls this feature. This patch makes it possible for hung_task_warnings to accept a special value to print an unlimited number of backtraces when khungtaskd detects hung tasks. The special value is -1. To use this value it is necessary to change types from ulong to int. Signed-off-by: Aaron Tomlin Reviewed-by: Rik van Riel Acked-by: David Rientjes Cc: oleg@redhat.com Link: http://lkml.kernel.org/r/1390239253-24030-3-git-send-email-atomlin@redhat.com [ Build warning fix. ] Signed-off-by: Ingo Molnar --- Documentation/sysctl/kernel.txt | 42 +++++++++++++++++++++++++++++++++++++++++ include/linux/sched/sysctl.h | 2 +- kernel/hung_task.c | 6 ++++-- kernel/sysctl.c | 8 +++++--- 4 files changed, 52 insertions(+), 6 deletions(-) diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 6d486404200e..4205f3c05cbe 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -33,6 +33,10 @@ show up in /proc/sys/kernel: - domainname - hostname - hotplug +- hung_task_panic +- hung_task_check_count +- hung_task_timeout_secs +- hung_task_warnings - kptr_restrict - kstack_depth_to_print [ X86 only ] - l2cr [ PPC only ] @@ -287,6 +291,44 @@ 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. + +============================================================== + kptr_restrict: This toggle indicates whether restrictions are placed on diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index 31e0193cb0c5..3a93f842306a 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -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); diff --git a/kernel/hung_task.c b/kernel/hung_task.c index 9328b80eaf14..0b9c169d577f 100644 --- a/kernel/hung_task.c +++ b/kernel/hung_task.c @@ -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, diff --git a/kernel/sysctl.c b/kernel/sysctl.c index c398a58673a7..dd5b4496637e 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -122,7 +122,8 @@ extern int blk_iopoll_enabled; static int sixty = 60; #endif -static int neg_one = -1; +static int __maybe_unused neg_one = -1; + static int zero; static int __maybe_unused one = 1; static int __maybe_unused two = 2; @@ -978,9 +979,10 @@ 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 -- cgit v1.2.3