Messages in this thread Patch in this message | | | From | Ricardo Neri <> | Subject | [RFC PATCH 15/23] kernel/watchdog: Add a function to obtain the watchdog_allowed_mask | Date | Tue, 12 Jun 2018 17:57:35 -0700 |
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Implementations of NMI watchdogs that use a single piece of hardware to monitor all the CPUs in the system (as opposed to per-CPU implementations such as perf) need to know which CPUs the watchdog is allowed to monitor. In this manner, non-maskable interrupts are directed only to the monitored CPUs.
Cc: Ashok Raj <ashok.raj@intel.com> Cc: Andi Kleen <andi.kleen@intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: Jacob Pan <jacob.jun.pan@intel.com> Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Frederic Weisbecker <frederic@kernel.org> Cc: Alexei Starovoitov <ast@kernel.org> Cc: Babu Moger <babu.moger@oracle.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Philippe Ombredanne <pombredanne@nexb.com> Cc: Colin Ian King <colin.king@canonical.com> Cc: Byungchul Park <byungchul.park@lge.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Cc: "Luis R. Rodriguez" <mcgrof@kernel.org> Cc: Waiman Long <longman@redhat.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Christoffer Dall <cdall@linaro.org> Cc: Marc Zyngier <marc.zyngier@arm.com> Cc: Kai-Heng Feng <kai.heng.feng@canonical.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: David Rientjes <rientjes@google.com> Cc: "Ravi V. Shankar" <ravi.v.shankar@intel.com> Cc: x86@kernel.org Cc: "David S. Miller" <davem@davemloft.net> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: iommu@lists.linux-foundation.org Cc: sparclinux@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com> --- include/linux/nmi.h | 1 + kernel/watchdog.c | 7 ++++++- 2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/include/linux/nmi.h b/include/linux/nmi.h index e61b441..e608762 100644 --- a/include/linux/nmi.h +++ b/include/linux/nmi.h @@ -77,6 +77,7 @@ static inline void reset_hung_task_detector(void) { } #if defined(CONFIG_HARDLOCKUP_DETECTOR) extern void hardlockup_detector_disable(void); +extern struct cpumask *watchdog_get_allowed_cpumask(void); extern unsigned int hardlockup_panic; #else static inline void hardlockup_detector_disable(void) {} diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 5057376..b94bbe3 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -50,7 +50,7 @@ int __read_mostly nmi_watchdog_available; static struct nmi_watchdog_ops *nmi_wd_ops; -struct cpumask watchdog_allowed_mask __read_mostly; +static struct cpumask watchdog_allowed_mask __read_mostly; struct cpumask watchdog_cpumask __read_mostly; unsigned long *watchdog_cpumask_bits = cpumask_bits(&watchdog_cpumask); @@ -98,6 +98,11 @@ static int __init hardlockup_all_cpu_backtrace_setup(char *str) } __setup("hardlockup_all_cpu_backtrace=", hardlockup_all_cpu_backtrace_setup); # endif /* CONFIG_SMP */ + +struct cpumask *watchdog_get_allowed_cpumask(void) +{ + return &watchdog_allowed_mask; +} #endif /* CONFIG_HARDLOCKUP_DETECTOR */ /* -- 2.7.4
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