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    sched: Fix hotplug vs. set_cpus_allowed_ptr() · 6acbfb96
    Lai Jiangshan 提交于
    Lai found that:
    
      WARNING: CPU: 1 PID: 13 at arch/x86/kernel/smp.c:124 native_smp_send_reschedule+0x2d/0x4b()
      ...
      migration_cpu_stop+0x1d/0x22
    
    was caused by set_cpus_allowed_ptr() assuming that cpu_active_mask is
    always a sub-set of cpu_online_mask.
    
    This isn't true since 5fbd036b ("sched: Cleanup cpu_active madness").
    
    So set active and online at the same time to avoid this particular
    problem.
    
    Fixes: 5fbd036b ("sched: Cleanup cpu_active madness")
    Signed-off-by: NLai Jiangshan <laijs@cn.fujitsu.com>
    Signed-off-by: NPeter Zijlstra <peterz@infradead.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Gautham R. Shenoy <ego@linux.vnet.ibm.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Michael wang <wangyun@linux.vnet.ibm.com>
    Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
    Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
    Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
    Cc: Toshi Kani <toshi.kani@hp.com>
    Link: http://lkml.kernel.org/r/53758B12.8060609@cn.fujitsu.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
    6acbfb96
cpu.c 18.3 KB