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7a6a9f1c5a
The driver needs to migrate the perf context if the current using CPU going
to teardown. By the time calling the cpuhp::teardown() callback the
cpu_online_mask() hasn't updated yet and still includes the CPU going to
teardown. In current driver's implementation we may migrate the context
to the teardown CPU and leads to the below calltrace:
...
[ 368.104662][ T932] task:cpuhp/0 state:D stack: 0 pid: 15 ppid: 2 flags:0x00000008
[ 368.113699][ T932] Call trace:
[ 368.116834][ T932] __switch_to+0x7c/0xbc
[ 368.120924][ T932] __schedule+0x338/0x6f0
[ 368.125098][ T932] schedule+0x50/0xe0
[ 368.128926][ T932] schedule_preempt_disabled+0x18/0x24
[ 368.134229][ T932] __mutex_lock.constprop.0+0x1d4/0x5dc
[ 368.139617][ T932] __mutex_lock_slowpath+0x1c/0x30
[ 368.144573][ T932] mutex_lock+0x50/0x60
[ 368.148579][ T932] perf_pmu_migrate_context+0x84/0x2b0
[ 368.153884][ T932] hisi_pcie_pmu_offline_cpu+0x90/0xe0 [hisi_pcie_pmu]
[ 368.160579][ T932] cpuhp_invoke_callback+0x2a0/0x650
[ 368.165707][ T932] cpuhp_thread_fun+0xe4/0x190
[ 368.170316][ T932] smpboot_thread_fn+0x15c/0x1a0
[ 368.175099][ T932] kthread+0x108/0x13c
[ 368.179012][ T932] ret_from_fork+0x10/0x18
...
Use function cpumask_any_but() to find one correct active cpu to fixes
this issue.
Fixes:
|
||
|---|---|---|
| .. | ||
| amlogic | ||
| arm_cspmu | ||
| hisilicon | ||
| alibaba_uncore_drw_pmu.c | ||
| apple_m1_cpu_pmu.c | ||
| arm_dmc620_pmu.c | ||
| arm_dsu_pmu.c | ||
| arm_pmu_acpi.c | ||
| arm_pmu_platform.c | ||
| arm_pmu.c | ||
| arm_pmuv3.c | ||
| arm_smmuv3_pmu.c | ||
| arm_spe_pmu.c | ||
| arm-cci.c | ||
| arm-ccn.c | ||
| arm-cmn.c | ||
| fsl_imx8_ddr_perf.c | ||
| Kconfig | ||
| Makefile | ||
| marvell_cn10k_ddr_pmu.c | ||
| marvell_cn10k_tad_pmu.c | ||
| qcom_l2_pmu.c | ||
| qcom_l3_pmu.c | ||
| riscv_pmu_legacy.c | ||
| riscv_pmu_sbi.c | ||
| riscv_pmu.c | ||
| thunderx2_pmu.c | ||
| xgene_pmu.c | ||