diff options
Diffstat (limited to 'lib/stackdepot.c')
| -rw-r--r-- | lib/stackdepot.c | 70 |
1 files changed, 37 insertions, 33 deletions
diff --git a/lib/stackdepot.c b/lib/stackdepot.c index 9fab711e4826..3c713f70b0a3 100644 --- a/lib/stackdepot.c +++ b/lib/stackdepot.c @@ -165,46 +165,50 @@ int __init stack_depot_early_init(void) int stack_depot_init(void) { static DEFINE_MUTEX(stack_depot_init_mutex); + unsigned long entries; int ret = 0; mutex_lock(&stack_depot_init_mutex); - if (!stack_depot_disabled && !stack_table) { - unsigned long entries; - /* - * Similarly to stack_depot_early_init, use stack_hash_order - * if assigned, and rely on automatic scaling otherwise. - */ - if (stack_hash_order) { - entries = 1UL << stack_hash_order; - } else { - int scale = STACK_HASH_SCALE; - - entries = nr_free_buffer_pages(); - entries = roundup_pow_of_two(entries); - - if (scale > PAGE_SHIFT) - entries >>= (scale - PAGE_SHIFT); - else - entries <<= (PAGE_SHIFT - scale); - } + if (stack_depot_disabled || stack_table) + goto out_unlock; - if (entries < 1UL << STACK_HASH_ORDER_MIN) - entries = 1UL << STACK_HASH_ORDER_MIN; - if (entries > 1UL << STACK_HASH_ORDER_MAX) - entries = 1UL << STACK_HASH_ORDER_MAX; - - pr_info("allocating hash table of %lu entries via kvcalloc\n", - entries); - stack_table = kvcalloc(entries, sizeof(struct stack_record *), GFP_KERNEL); - if (!stack_table) { - pr_err("hash table allocation failed, disabling\n"); - stack_depot_disabled = true; - ret = -ENOMEM; - } - stack_hash_mask = entries - 1; + /* + * Similarly to stack_depot_early_init, use stack_hash_order + * if assigned, and rely on automatic scaling otherwise. + */ + if (stack_hash_order) { + entries = 1UL << stack_hash_order; + } else { + int scale = STACK_HASH_SCALE; + + entries = nr_free_buffer_pages(); + entries = roundup_pow_of_two(entries); + + if (scale > PAGE_SHIFT) + entries >>= (scale - PAGE_SHIFT); + else + entries <<= (PAGE_SHIFT - scale); } + + if (entries < 1UL << STACK_HASH_ORDER_MIN) + entries = 1UL << STACK_HASH_ORDER_MIN; + if (entries > 1UL << STACK_HASH_ORDER_MAX) + entries = 1UL << STACK_HASH_ORDER_MAX; + + pr_info("allocating hash table of %lu entries via kvcalloc\n", entries); + stack_table = kvcalloc(entries, sizeof(struct stack_record *), GFP_KERNEL); + if (!stack_table) { + pr_err("hash table allocation failed, disabling\n"); + stack_depot_disabled = true; + ret = -ENOMEM; + goto out_unlock; + } + stack_hash_mask = entries - 1; + +out_unlock: mutex_unlock(&stack_depot_init_mutex); + return ret; } EXPORT_SYMBOL_GPL(stack_depot_init); |