From 53b8a315b76a3f3c70a5644976c0095460eb13d8 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 20 Feb 2007 13:57:51 -0800 Subject: [PATCH] [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 Cc: Frederik Deweerdt Cc: Neil Brown Cc: Trond Myklebust Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/cpumask.h | 4 ++-- init/main.c | 13 +++++++++---- lib/cpumask.c | 18 ++---------------- net/bridge/netfilter/ebtables.c | 9 +++------ net/sunrpc/svc.c | 2 +- 5 files changed, 17 insertions(+), 29 deletions(-) diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h index d0e8c8b0e34..23f55140ccd 100644 --- a/include/linux/cpumask.h +++ b/include/linux/cpumask.h @@ -398,11 +398,11 @@ extern cpumask_t cpu_present_map; #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 1c5f6dce1bd..a92989e7836 100644 --- a/init/main.c +++ b/init/main.c @@ -387,14 +387,19 @@ static void __init setup_per_cpu_areas(void) /* 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 3a67dc5ada7..1ea2c184315 100644 --- a/lib/cpumask.c +++ b/lib/cpumask.c @@ -15,22 +15,8 @@ int __next_cpu(int n, const cpumask_t *srcp) } 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 34c49799f9b..ac9984f98e5 100644 --- a/net/bridge/netfilter/ebtables.c +++ b/net/bridge/netfilter/ebtables.c @@ -833,8 +833,7 @@ static int translate_table(char *name, struct ebt_table_info *newinfo) /* 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 @@ static int do_replace(void __user *user, unsigned int len) 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 @@ int ebt_register_table(struct ebt_table *table) 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 232a99715ef..8353829bc5c 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -115,7 +115,7 @@ fail: 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; -- 2.39.3