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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-18 14:34:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-10-18 14:34:50 -0700 |
| commit | 41eea65e2aaadc0611fd56a1b177ce25dcc4c1df (patch) | |
| tree | 75a923658e76b40792db00c79ff2f115b07b963a /lib/nmi_backtrace.c | |
| parent | 373014bb517e0bb291714fe1e232fb606d54931b (diff) | |
| parent | b36c830f8c9b13bfe69b117e879153776c19ad82 (diff) | |
| download | kernel_replicant_linux-41eea65e2aaadc0611fd56a1b177ce25dcc4c1df.tar.gz kernel_replicant_linux-41eea65e2aaadc0611fd56a1b177ce25dcc4c1df.tar.bz2 kernel_replicant_linux-41eea65e2aaadc0611fd56a1b177ce25dcc4c1df.zip | |
Merge tag 'core-rcu-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull RCU changes from Ingo Molnar:
- Debugging for smp_call_function()
- RT raw/non-raw lock ordering fixes
- Strict grace periods for KASAN
- New smp_call_function() torture test
- Torture-test updates
- Documentation updates
- Miscellaneous fixes
[ This doesn't actually pull the tag - I've dropped the last merge from
the RCU branch due to questions about the series. - Linus ]
* tag 'core-rcu-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (77 commits)
smp: Make symbol 'csd_bug_count' static
kernel/smp: Provide CSD lock timeout diagnostics
smp: Add source and destination CPUs to __call_single_data
rcu: Shrink each possible cpu krcp
rcu/segcblist: Prevent useless GP start if no CBs to accelerate
torture: Add gdb support
rcutorture: Allow pointer leaks to test diagnostic code
rcutorture: Hoist OOM registry up one level
refperf: Avoid null pointer dereference when buf fails to allocate
rcutorture: Properly synchronize with OOM notifier
rcutorture: Properly set rcu_fwds for OOM handling
torture: Add kvm.sh --help and update help message
rcutorture: Add CONFIG_PROVE_RCU_LIST to TREE05
torture: Update initrd documentation
rcutorture: Replace HTTP links with HTTPS ones
locktorture: Make function torture_percpu_rwsem_init() static
torture: document --allcpus argument added to the kvm.sh script
rcutorture: Output number of elapsed grace periods
rcutorture: Remove KCSAN stubs
rcu: Remove unused "cpu" parameter from rcu_report_qs_rdp()
...
Diffstat (limited to 'lib/nmi_backtrace.c')
| -rw-r--r-- | lib/nmi_backtrace.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/lib/nmi_backtrace.c b/lib/nmi_backtrace.c index 15ca78e1c7d4..8abe1870dba4 100644 --- a/lib/nmi_backtrace.c +++ b/lib/nmi_backtrace.c @@ -85,12 +85,16 @@ void nmi_trigger_cpumask_backtrace(const cpumask_t *mask, put_cpu(); } +// Dump stacks even for idle CPUs. +static bool backtrace_idle; +module_param(backtrace_idle, bool, 0644); + bool nmi_cpu_backtrace(struct pt_regs *regs) { int cpu = smp_processor_id(); if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) { - if (regs && cpu_in_idle(instruction_pointer(regs))) { + if (!READ_ONCE(backtrace_idle) && regs && cpu_in_idle(instruction_pointer(regs))) { pr_warn("NMI backtrace for cpu %d skipped: idling at %pS\n", cpu, (void *)instruction_pointer(regs)); } else { |