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percpu: make percpu symbols under kernel/ and mm/ unique

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This patch updates percpu related symbols under kernel/ and mm/ such
that percpu symbols are unique and don't clash with local symbols.
This serves two purposes of decreasing the possibility of global
percpu symbol collision and allowing dropping per_cpu__ prefix from
percpu symbols.

* kernel/lockdep.c: s/lock_stats/cpu_lock_stats/

* kernel/sched.c: s/init_rq_rt/init_rt_rq_var/	(any better idea?)
  		  s/sched_group_cpus/sched_groups/

* kernel/softirq.c: s/ksoftirqd/run_ksoftirqd/a

* kernel/softlockup.c: s/(*)_timestamp/softlockup_\1_ts/
  		       s/watchdog_task/softlockup_watchdog/
		       s/timestamp/ts/ for local variables

* kernel/time/timer_stats: s/lookup_lock/tstats_lookup_lock/

* mm/slab.c: s/reap_work/slab_reap_work/
  	     s/reap_node/slab_reap_node/

* mm/vmstat.c: local variable changed to avoid collision with vmstat_work

Partly based on Rusty Russell's "alloc_percpu: rename percpu vars
which cause name clashes" patch.

Signed-off-by: Tejun Heo <[email protected]>
Acked-by: (slab/vmstat) Christoph Lameter <[email protected]>
Reviewed-by: Christoph Lameter <[email protected]>
Cc: Rusty Russell <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Nick Piggin <[email protected]>
This commit is contained in:
Tejun Heo 2009-10-29 22:34:13 +09:00
commit 1871e52c76
7 changed files with 57 additions and 56 deletions
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18
mm/slab.c
View file

@ -685,7 +685,7 @@ int slab_is_available(void)
return g_cpucache_up >= EARLY;
}
static DEFINE_PER_CPU(struct delayed_work, reap_work);
static DEFINE_PER_CPU(struct delayed_work, slab_reap_work);
static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep)
{
@ -826,7 +826,7 @@ __setup("noaliencache", noaliencache_setup);
* objects freed on different nodes from which they were allocated) and the
* flushing of remote pcps by calling drain_node_pages.
*/
static DEFINE_PER_CPU(unsigned long, reap_node);
static DEFINE_PER_CPU(unsigned long, slab_reap_node);
static void init_reap_node(int cpu)
{
@ -836,17 +836,17 @@ static void init_reap_node(int cpu)
if (node == MAX_NUMNODES)
node = first_node(node_online_map);
per_cpu(reap_node, cpu) = node;
per_cpu(slab_reap_node, cpu) = node;
}
static void next_reap_node(void)
{
int node = __get_cpu_var(reap_node);
int node = __get_cpu_var(slab_reap_node);
node = next_node(node, node_online_map);
if (unlikely(node >= MAX_NUMNODES))
node = first_node(node_online_map);
__get_cpu_var(reap_node) = node;
__get_cpu_var(slab_reap_node) = node;
}
#else
@ -863,7 +863,7 @@ static void next_reap_node(void)
*/
static void __cpuinit start_cpu_timer(int cpu)
{
struct delayed_work *reap_work = &per_cpu(reap_work, cpu);
struct delayed_work *reap_work = &per_cpu(slab_reap_work, cpu);
/*
* When this gets called from do_initcalls via cpucache_init(),
@ -1027,7 +1027,7 @@ static void __drain_alien_cache(struct kmem_cache *cachep,
*/
static void reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3)
{
int node = __get_cpu_var(reap_node);
int node = __get_cpu_var(slab_reap_node);
if (l3->alien) {
struct array_cache *ac = l3->alien[node];
@ -1286,9 +1286,9 @@ static int __cpuinit cpuup_callback(struct notifier_block *nfb,
* anything expensive but will only modify reap_work
* and reschedule the timer.
*/
cancel_rearming_delayed_work(&per_cpu(reap_work, cpu));
cancel_rearming_delayed_work(&per_cpu(slab_reap_work, cpu));
/* Now the cache_reaper is guaranteed to be not running. */
per_cpu(reap_work, cpu).work.func = NULL;
per_cpu(slab_reap_work, cpu).work.func = NULL;
break;
case CPU_DOWN_FAILED:
case CPU_DOWN_FAILED_FROZEN: