On 10/13/2015 02:26 PM, Thomas Gleixner wrote:
On Tue, 13 Oct 2015, Qais Yousef wrote:cpumask is limited to NR_CPUS. introduce ipi_mask which allows us to address cpu range that is higher than NR_CPUS which is required for drivers to send IPIs for coprocessor that are outside Linux CPU range. Signed-off-by: Qais Yousef <qais.yousef@xxxxxxxxxx> --- include/linux/irq.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/include/linux/irq.h b/include/linux/irq.h index 11bf09288ddb..4b537e4d393b 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -125,6 +125,21 @@ enum { struct msi_desc; struct irq_domain;+ /**+ * struct ipi_mask - IPI mask information + * @cpumask: bitmap of cpumasks + * @nbits: number of bits in cpumask + * @global: whether the mask is SMP IPI ie: subset of cpu_possible_mask or not + * + * ipi_mask is similar to cpumask, but it provides nbits that's configurable + * rather than fixed to NR_CPUS. + */ +struct ipi_mask { + unsigned long *cpumask; + unsigned int nbits; + bool global; +};Can you make that: struct ipi_mask { unsigned int nbits; bool global; unsigned long cpu_bitmap[]; }; That allows you to allocate the data structure in one go. So the ipi_mask in irq_data_common becomes a pointer which is only filled in when ipi_mask is actually used. Note, I renamed cpumask to cpu_bitmap to avoid confusion with cpumasks. We also want a helper function struct cpumask *irq_data_get_ipi_mask(struct irq_data *data); so we can use normal cpumask operations for the majority of cases.
Will do. Thanks, Qais
