sched: Clean up scheduler_ipi()
The scheduler IPI has grown weird and wonderful over the years, time for spring cleaning. Move all the non-trivial stuff out of it and into a regular smp function call IPI. This then reduces the schedule_ipi() to most of it's former NOP glory and ensures to keep the interrupt vector lean and mean. Aside of that avoiding the full irq_enter() in the x86 IPI implementation is incorrect as scheduler_ipi() can be instrumented. To work around that scheduler_ipi() had an irq_enter/exit() hack when heavy work was pending. This is gone now. Signed-off-by:Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Reviewed-by:
Alexandre Chartre <alexandre.chartre@oracle.com> Link: https://lkml.kernel.org/r/20200505134058.361859938@linutronix.de
parent
b1d1779e
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