Commits
Yang Wei committed ec756d45b7f
MIPS: perf: Mark pmu interupt IRQF_NO_THREAD In RT kernel, I ran into the following calltrace, so PMU interrupts cannot be threaded in_atomic(): 1, irqs_disabled(): 1, pid: 0, name: swapper/0 INFO: lockdep is turned off. Call Trace: [<ffffffff8088595c>] dump_stack+0x1c/0x50 [<ffffffff801a958c>] __might_sleep+0x13c/0x148 [<ffffffff80891c54>] rt_spin_lock+0x3c/0xb0 [<ffffffff801ad29c>] __wake_up+0x3c/0x80 [<ffffffff80243ba4>] perf_event_wakeup+0x8c/0xf8 [<ffffffff80243c50>] perf_pending_event+0x40/0x78 [<ffffffff8023d88c>] irq_work_run+0x74/0xc0 [<ffffffff80152640>] mipsxx_pmu_handle_shared_irq+0x110/0x228 [<ffffffff8015276c>] mipsxx_pmu_handle_irq+0x14/0x30 [<ffffffff801ffda4>] handle_irq_event_percpu+0xbc/0x470 [<ffffffff80204478>] handle_percpu_irq+0x98/0xc8 [<ffffffff801ff284>] generic_handle_irq+0x4c/0x68 [<ffffffff8089748c>] do_IRQ+0x2c/0x48 [<ffffffff80105864>] plat_irq_dispatch+0x64/0xd0 [ralf@linux-mips.org: I don't see why based on this register dump the handler should be marked IRQF_NO_THREAD - but the handler is manipulating per-CPU resources so we don't want it to be rescheduled to another CPU.] Signed-off-by: Yang Wei <Wei.Yang@windriver.com> Cc: a.p.zijlstra@chello.nl Cc: paulus@samba.org Cc: mingo@redhat.com Cc: acme@kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/7506/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>