| Message ID | 20130122074335.13822.41002.stgit@srivatsabhat.in.ibm.com (mailing list archive) |
|---|---|
| State | Not Applicable, archived |
| Headers | show |
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c index 6266730..f7851b7 100644 --- a/arch/parisc/kernel/smp.c +++ b/arch/parisc/kernel/smp.c @@ -229,11 +229,13 @@ static inline void send_IPI_allbutself(enum ipi_message_type op) { int i; - + + get_online_cpus_atomic(); for_each_online_cpu(i) { if (i != smp_processor_id()) send_IPI_single(i, op); } + put_online_cpus_atomic(); }
Once stop_machine() is gone from the CPU offline path, we won't be able to depend on preempt_disable() or local_irq_disable() to prevent CPUs from going offline from under us. Use the get/put_online_cpus_atomic() APIs to prevent CPUs from going offline, while invoking from atomic context. Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: linux-parisc@vger.kernel.org Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> --- arch/parisc/kernel/smp.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html