[NETFILTER]: Fix OOPSes on machines with discontiguous cpu numbering.
Original patch by Harald Welte, with feedback from Herbert Xu
and testing by Sébastien Bernard.
EBTABLES, ARP tables, and IP/IP6 tables all assume that cpus
are numbered linearly. That is not necessarily true.
This patch fixes that up by calculating the largest possible
cpu number, and allocating enough per-cpu structure space given
that.
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index b15826f..fe97783 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -392,4 +392,16 @@
#define for_each_online_cpu(cpu) for_each_cpu_mask((cpu), cpu_online_map)
#define for_each_present_cpu(cpu) for_each_cpu_mask((cpu), cpu_present_map)
+/* Find the highest possible smp_processor_id() */
+static inline unsigned int highest_possible_processor_id(void)
+{
+ unsigned int cpu, highest = 0;
+
+ for_each_cpu_mask(cpu, cpu_possible_map)
+ highest = cpu;
+
+ return highest;
+}
+
+
#endif /* __LINUX_CPUMASK_H */