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| author | Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com> | 2006-10-27 19:49:53 +0900 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2006-10-31 14:17:27 -0800 |
| commit | 5ee7737379b1d7f0c977c0f1661fbaf01a8d4721 (patch) | |
| tree | 9a6c4d4a0bf94d5b586e60710a19addda2bcf2b0 /arch/ia64/kernel/smp.c | |
| parent | f2454a1a4b2aca38d3b7887619f43291d773c1ee (diff) | |
| download | blackbird-op-linux-5ee7737379b1d7f0c977c0f1661fbaf01a8d4721.tar.gz blackbird-op-linux-5ee7737379b1d7f0c977c0f1661fbaf01a8d4721.zip | |
[IA64] cpu-hotplug: Fixing confliction between CPU hot-add and IPI
Signed-off-by: Kenji Kaneshige <kaneshige.kenji@jp.fujitsu.com>
Acked-by: Satoru Takeuchi <takeuchi_satoru@jp.fujitsu.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/smp.c')
| -rw-r--r-- | arch/ia64/kernel/smp.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c index 657ac99a451c..2763e7917781 100644 --- a/arch/ia64/kernel/smp.c +++ b/arch/ia64/kernel/smp.c @@ -328,10 +328,14 @@ int smp_call_function (void (*func) (void *info), void *info, int nonatomic, int wait) { struct call_data_struct data; - int cpus = num_online_cpus()-1; + int cpus; - if (!cpus) + spin_lock(&call_lock); + cpus = num_online_cpus() - 1; + if (!cpus) { + spin_unlock(&call_lock); return 0; + } /* Can deadlock when called with interrupts disabled */ WARN_ON(irqs_disabled()); @@ -343,8 +347,6 @@ smp_call_function (void (*func) (void *info), void *info, int nonatomic, int wai if (wait) atomic_set(&data.finished, 0); - spin_lock(&call_lock); - call_data = &data; mb(); /* ensure store to call_data precedes setting of IPI_CALL_FUNC */ send_IPI_allbutself(IPI_CALL_FUNC); |
