f6b30d32d2
kick_handler() doesn't have an irq_enter/exit pair, but it's used for handling SMP IPIs which require work to be done in softirqs, which are invoked from irq_exit() when the hard irq nest count reaches 0. The scheduler_ipi() callback in the IPI handler calls irq_enter/exit itself, but this is inside kick_handler()'s spin lock critical section, so if an invoked softirq issues an IPI the kick_handler() will be re-entered on the same CPU and will deadlock. This is easily fixed by adding the missing irq_enter/exit to kick_handler() so that the hard irq nest count doesn't reach 0 until after the spin lock has been released. Ideally the spin lock protected handler list will also be replaced by a lockless RCU protected list since it is certainly mostly read. That can be done in a later change though. Signed-off-by: James Hogan <james.hogan@imgtec.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> |
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| .. | ||
| perf | ||
| .gitignore | ||
| asm-offsets.c | ||
| cachepart.c | ||
| clock.c | ||
| core_reg.c | ||
| da.c | ||
| devtree.c | ||
| dma.c | ||
| ftrace.c | ||
| ftrace_stub.S | ||
| head.S | ||
| irq.c | ||
| kick.c | ||
| machines.c | ||
| Makefile | ||
| metag_ksyms.c | ||
| module.c | ||
| perf_callchain.c | ||
| process.c | ||
| ptrace.c | ||
| setup.c | ||
| signal.c | ||
| smp.c | ||
| stacktrace.c | ||
| sys_metag.c | ||
| tbiunexp.S | ||
| tcm.c | ||
| time.c | ||
| topology.c | ||
| traps.c | ||
| user_gateway.S | ||
| vmlinux.lds.S | ||