[PATCH] RCU - cpu-offline-cleanup [1/3]

From: Dipankar Sarma (dipankar_at_in.ibm.com)
Date: 07/31/04

  • Next message: Dipankar Sarma: "Re: [PATCH] RCU - rcu-cpu-offline-fix [2/3]" 
    Date:	Sat, 31 Jul 2004 14:24:03 +0530
To: Andrew Morton <akpm@osdl.org>

    Andrew,

    There is a series of patches in my tree and these 3 are the first
    ones that should probably be merged down the road. Descriptions are on
    top of the patches. Please include them in -mm.

    A lot of RCU code will be cleaned up later in order to support
    call_rcu_bh(), the separate RCU interface that considers softirq
    handler completion a quiescent state.

    Thanks
    Dipankar

    Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com>

    Minor cleanup of the hotplug code to remove #ifdef in cpu
    event notifier handler. If CONFIG_HOTPLUG_CPU is not defined,
    CPU_DEAD case will be optimized off.

     kernel/rcupdate.c | 8 ++++++--
     1 files changed, 6 insertions(+), 2 deletions(-)

    diff -puN kernel/rcupdate.c~cpu-offline-cleanup kernel/rcupdate.c
    --- linux-2.6.8-rc2-rcu/kernel/rcupdate.c~cpu-offline-cleanup 2004-07-29 13:35:18.000000000 +0530
    +++ linux-2.6.8-rc2-rcu-dipankar/kernel/rcupdate.c 2004-07-29 13:41:18.000000000 +0530
    @@ -242,6 +242,12 @@ unlock:
             tasklet_kill_immediate(&RCU_tasklet(cpu), cpu);
     }
     
    +#else
    +
    +static void rcu_offline_cpu(int cpu)
    +{
    +}
    +
     #endif
     
     void rcu_restart_cpu(int cpu)
    @@ -325,11 +331,9 @@ static int __devinit rcu_cpu_notify(stru
             case CPU_UP_PREPARE:
                     rcu_online_cpu(cpu);
                     break;
    -#ifdef CONFIG_HOTPLUG_CPU
             case CPU_DEAD:
                     rcu_offline_cpu(cpu);
                     break;
    -#endif
             default:
                     break;
             }

    _
    -
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