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author | Ingo Molnar <mingo@elte.hu> | 2008-07-06 14:23:39 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-07-06 14:23:39 +0200 |
commit | 68083e05d72d94f347293d8cc0067050ba904bfa (patch) | |
tree | 842e71365bd90866be7add181661a4039d891564 /kernel/rcuclassic.c | |
parent | 7baac8b91f9871ba8cb09af84de4ae1d86d07812 (diff) | |
parent | b7279469d66b55119784b8b9529c99c1955fe747 (diff) | |
download | kernel_samsung_smdk4412-68083e05d72d94f347293d8cc0067050ba904bfa.zip kernel_samsung_smdk4412-68083e05d72d94f347293d8cc0067050ba904bfa.tar.gz kernel_samsung_smdk4412-68083e05d72d94f347293d8cc0067050ba904bfa.tar.bz2 |
Merge commit 'v2.6.26-rc9' into cpus4096
Diffstat (limited to 'kernel/rcuclassic.c')
-rw-r--r-- | kernel/rcuclassic.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/kernel/rcuclassic.c b/kernel/rcuclassic.c index 251358d..adde103 100644 --- a/kernel/rcuclassic.c +++ b/kernel/rcuclassic.c @@ -89,8 +89,22 @@ static void force_quiescent_state(struct rcu_data *rdp, /* * Don't send IPI to itself. With irqs disabled, * rdp->cpu is the current cpu. + * + * cpu_online_map is updated by the _cpu_down() + * using stop_machine_run(). Since we're in irqs disabled + * section, stop_machine_run() is not exectuting, hence + * the cpu_online_map is stable. + * + * However, a cpu might have been offlined _just_ before + * we disabled irqs while entering here. + * And rcu subsystem might not yet have handled the CPU_DEAD + * notification, leading to the offlined cpu's bit + * being set in the rcp->cpumask. + * + * Hence cpumask = (rcp->cpumask & cpu_online_map) to prevent + * sending smp_reschedule() to an offlined CPU. */ - cpumask = rcp->cpumask; + cpus_and(cpumask, rcp->cpumask, cpu_online_map); cpu_clear(rdp->cpu, cpumask); for_each_cpu_mask_nr(cpu, cpumask) smp_send_reschedule(cpu); |