[PATCH] Convert highest_possible_processor_id to nr_cpu_ids
We frequently need the maximum number of possible processors in order to
allocate arrays for all processors. So far this was done using
highest_possible_processor_id(). However, we do need the number of
processors not the highest id. Moreover the number was so far dynamically
calculated on each invokation. The number of possible processors does not
change when the system is running. We can therefore calculate that number
once.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Frederik Deweerdt <frederik.deweerdt@gmail.com>
Cc: Neil Brown <neilb@suse.de>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index d0e8c8b..23f5514 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -398,11 +398,11 @@
#endif
#ifdef CONFIG_SMP
-int highest_possible_processor_id(void);
+extern int nr_cpu_ids;
#define any_online_cpu(mask) __any_online_cpu(&(mask))
int __any_online_cpu(const cpumask_t *mask);
#else
-#define highest_possible_processor_id() 0
+#define nr_cpu_ids 1
#define any_online_cpu(mask) 0
#endif
diff --git a/init/main.c b/init/main.c
index 1c5f6dc..a92989e 100644
--- a/init/main.c
+++ b/init/main.c
@@ -387,14 +387,19 @@
/* Called by boot processor to activate the rest. */
static void __init smp_init(void)
{
- unsigned int i;
+ unsigned int cpu;
+ unsigned highest = 0;
+
+ for_each_cpu_mask(cpu, cpu_possible_map)
+ highest = cpu;
+ nr_cpu_ids = highest + 1;
/* FIXME: This should be done in userspace --RR */
- for_each_present_cpu(i) {
+ for_each_present_cpu(cpu) {
if (num_online_cpus() >= max_cpus)
break;
- if (!cpu_online(i))
- cpu_up(i);
+ if (!cpu_online(cpu))
+ cpu_up(cpu);
}
/* Any cleanup work */
diff --git a/lib/cpumask.c b/lib/cpumask.c
index 3a67dc5..1ea2c18 100644
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -15,22 +15,8 @@
}
EXPORT_SYMBOL(__next_cpu);
-/*
- * Find the highest possible smp_processor_id()
- *
- * Note: if we're prepared to assume that cpu_possible_map never changes
- * (reasonable) then this function should cache its return value.
- */
-int highest_possible_processor_id(void)
-{
- unsigned int cpu;
- unsigned highest = 0;
-
- for_each_cpu_mask(cpu, cpu_possible_map)
- highest = cpu;
- return highest;
-}
-EXPORT_SYMBOL(highest_possible_processor_id);
+int nr_cpu_ids;
+EXPORT_SYMBOL(nr_cpu_ids);
int __any_online_cpu(const cpumask_t *mask)
{
diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index 34c4979..ac9984f 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -833,8 +833,7 @@
/* this will get free'd in do_replace()/ebt_register_table()
if an error occurs */
newinfo->chainstack =
- vmalloc((highest_possible_processor_id()+1)
- * sizeof(*(newinfo->chainstack)));
+ vmalloc(nr_cpu_ids * sizeof(*(newinfo->chainstack)));
if (!newinfo->chainstack)
return -ENOMEM;
for_each_possible_cpu(i) {
@@ -947,8 +946,7 @@
if (tmp.num_counters >= INT_MAX / sizeof(struct ebt_counter))
return -ENOMEM;
- countersize = COUNTER_OFFSET(tmp.nentries) *
- (highest_possible_processor_id()+1);
+ countersize = COUNTER_OFFSET(tmp.nentries) * nr_cpu_ids;
newinfo = vmalloc(sizeof(*newinfo) + countersize);
if (!newinfo)
return -ENOMEM;
@@ -1168,8 +1166,7 @@
return -EINVAL;
}
- countersize = COUNTER_OFFSET(repl->nentries) *
- (highest_possible_processor_id()+1);
+ countersize = COUNTER_OFFSET(repl->nentries) * nr_cpu_ids;
newinfo = vmalloc(sizeof(*newinfo) + countersize);
ret = -ENOMEM;
if (!newinfo)
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 232a997..8353829 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -115,7 +115,7 @@
static int
svc_pool_map_init_percpu(struct svc_pool_map *m)
{
- unsigned int maxpools = highest_possible_processor_id() + 1;
+ unsigned int maxpools = nr_cpu_ids;
unsigned int pidx = 0;
unsigned int cpu;
int err;