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path: root/drivers/block/zram/zcomp.c
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Diffstat (limited to 'drivers/block/zram/zcomp.c')
-rw-r--r--drivers/block/zram/zcomp.c76
1 files changed, 25 insertions, 51 deletions
diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
index 4b5cd3a7b2b6..12046f4f00e4 100644
--- a/drivers/block/zram/zcomp.c
+++ b/drivers/block/zram/zcomp.c
@@ -160,82 +160,56 @@ int zcomp_decompress(struct zcomp_strm *zstrm,
dst, &dst_len);
}
-static int __zcomp_cpu_notifier(struct zcomp *comp,
- unsigned long action, unsigned long cpu)
+int zcomp_cpu_up_prepare(unsigned int cpu, struct hlist_node *node)
{
+ struct zcomp *comp = hlist_entry(node, struct zcomp, node);
struct zcomp_strm *zstrm;
- switch (action) {
- case CPU_UP_PREPARE:
- if (WARN_ON(*per_cpu_ptr(comp->stream, cpu)))
- break;
- zstrm = zcomp_strm_alloc(comp);
- if (IS_ERR_OR_NULL(zstrm)) {
- pr_err("Can't allocate a compression stream\n");
- return NOTIFY_BAD;
- }
- *per_cpu_ptr(comp->stream, cpu) = zstrm;
- break;
- case CPU_DEAD:
- case CPU_UP_CANCELED:
- zstrm = *per_cpu_ptr(comp->stream, cpu);
- if (!IS_ERR_OR_NULL(zstrm))
- zcomp_strm_free(zstrm);
- *per_cpu_ptr(comp->stream, cpu) = NULL;
- break;
- default:
- break;
+ if (WARN_ON(*per_cpu_ptr(comp->stream, cpu)))
+ return 0;
+
+ zstrm = zcomp_strm_alloc(comp);
+ if (IS_ERR_OR_NULL(zstrm)) {
+ pr_err("Can't allocate a compression stream\n");
+ return -ENOMEM;
}
- return NOTIFY_OK;
+ *per_cpu_ptr(comp->stream, cpu) = zstrm;
+ return 0;
}
-static int zcomp_cpu_notifier(struct notifier_block *nb,
- unsigned long action, void *pcpu)
+int zcomp_cpu_dead(unsigned int cpu, struct hlist_node *node)
{
- unsigned long cpu = (unsigned long)pcpu;
- struct zcomp *comp = container_of(nb, typeof(*comp), notifier);
+ struct zcomp *comp = hlist_entry(node, struct zcomp, node);
+ struct zcomp_strm *zstrm;
- return __zcomp_cpu_notifier(comp, action, cpu);
+ zstrm = *per_cpu_ptr(comp->stream, cpu);
+ if (!IS_ERR_OR_NULL(zstrm))
+ zcomp_strm_free(zstrm);
+ *per_cpu_ptr(comp->stream, cpu) = NULL;
+ return 0;
}
static int zcomp_init(struct zcomp *comp)
{
- unsigned long cpu;
int ret;
- comp->notifier.notifier_call = zcomp_cpu_notifier;
-
comp->stream = alloc_percpu(struct zcomp_strm *);
if (!comp->stream)
return -ENOMEM;
- cpu_notifier_register_begin();
- for_each_online_cpu(cpu) {
- ret = __zcomp_cpu_notifier(comp, CPU_UP_PREPARE, cpu);
- if (ret == NOTIFY_BAD)
- goto cleanup;
- }
- __register_cpu_notifier(&comp->notifier);
- cpu_notifier_register_done();
+ ret = cpuhp_state_add_instance(CPUHP_ZCOMP_PREPARE, &comp->node);
+ if (ret < 0)
+ goto cleanup;
return 0;
cleanup:
- for_each_online_cpu(cpu)
- __zcomp_cpu_notifier(comp, CPU_UP_CANCELED, cpu);
- cpu_notifier_register_done();
- return -ENOMEM;
+ free_percpu(comp->stream);
+ return ret;
}
void zcomp_destroy(struct zcomp *comp)
{
- unsigned long cpu;
-
- cpu_notifier_register_begin();
- for_each_online_cpu(cpu)
- __zcomp_cpu_notifier(comp, CPU_UP_CANCELED, cpu);
- __unregister_cpu_notifier(&comp->notifier);
- cpu_notifier_register_done();
-
+ cpuhp_state_remove_instance(CPUHP_ZCOMP_PREPARE, &comp->node);
free_percpu(comp->stream);
kfree(comp);
}