From: Li Zhengyu lizhengyu3@huawei.com

hulk inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I59IQS CVE: NA

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Use non nmi ipi to support backtrace on arm64 with nmi unsupported. It has been tested on qemu.

Signed-off-by: Li Zhengyu lizhengyu3@huawei.com Reviewed-by: Liao Chang liaochang1@huawei.com Reviewed-by: Wei Li liwei391@huawei.com Signed-off-by: Zheng Zengkai zhengzengkai@huawei.com Signed-off-by: Liao Chen liaochen4@huawei.com --- arch/arm64/kernel/ipi_nmi.c | 19 +++++++++++++++---- 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/arch/arm64/kernel/ipi_nmi.c b/arch/arm64/kernel/ipi_nmi.c index 3b105852fc17..d2af2bb35666 100644 --- a/arch/arm64/kernel/ipi_nmi.c +++ b/arch/arm64/kernel/ipi_nmi.c @@ -33,13 +33,24 @@ void arm64_send_nmi(cpumask_t *mask) __ipi_send_mask(ipi_nmi_desc, mask); }

-bool arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) +static void ipi_cpu_backtrace(void *info) { - if (!ipi_nmi_desc) - return false; + __printk_safe_enter(); + nmi_cpu_backtrace(get_irq_regs()); + __printk_safe_exit(); +}

- nmi_trigger_cpumask_backtrace(mask, exclude_self, arm64_send_nmi); +static void arm64_send_ipi(cpumask_t *mask) +{ + smp_call_function_many(mask, ipi_cpu_backtrace, NULL, false); +}

+bool arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self) +{ + if (!ipi_nmi_desc) + nmi_trigger_cpumask_backtrace(mask, exclude_self, arm64_send_ipi); + else + nmi_trigger_cpumask_backtrace(mask, exclude_self, arm64_send_nmi); return true; }