| .. | .. |
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| 75 | 75 | touch_softlockup_watchdog(); |
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| 76 | 76 | } |
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| 77 | 77 | |
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| 78 | | - /* |
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| 79 | | - * Force flush any remote buffers that might be stuck in IRQ context |
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| 80 | | - * and therefore could not run their irq_work. |
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| 81 | | - */ |
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| 82 | | - printk_safe_flush(); |
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| 83 | | - |
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| 84 | 78 | clear_bit_unlock(0, &backtrace_flag); |
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| 85 | 79 | put_cpu(); |
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| 86 | 80 | } |
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| 81 | + |
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| 82 | +// Dump stacks even for idle CPUs. |
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| 83 | +static bool backtrace_idle; |
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| 84 | +module_param(backtrace_idle, bool, 0644); |
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| 87 | 85 | |
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| 88 | 86 | bool nmi_cpu_backtrace(struct pt_regs *regs) |
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| 89 | 87 | { |
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| 90 | 88 | int cpu = smp_processor_id(); |
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| 91 | 89 | |
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| 92 | 90 | if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) { |
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| 93 | | - if (regs && cpu_in_idle(instruction_pointer(regs))) { |
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| 91 | + if (!READ_ONCE(backtrace_idle) && regs && cpu_in_idle(instruction_pointer(regs))) { |
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| 94 | 92 | pr_warn("NMI backtrace for cpu %d skipped: idling at %pS\n", |
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| 95 | 93 | cpu, (void *)instruction_pointer(regs)); |
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| 96 | 94 | } else { |
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