2023-01-30 20:51:01

by andrey.konovalov

Subject: [PATCH 07/18] lib/stackdepot: lower the indentation in stack_depot_init

From: Andrey Konovalov <[email protected]>

stack_depot_init does most things inside an if check. Move them out and
use a goto statement instead.

No functional changes.

Signed-off-by: Andrey Konovalov <[email protected]>
---
lib/stackdepot.c | 70 +++++++++++++++++++++++++-----------------------
1 file changed, 37 insertions(+), 33 deletions(-)

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index b06f6a5caa83..cb098bc99286 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);
--
2.25.1

2023-01-31 10:38:30

by Alexander Potapenko

Subject: Re: [PATCH 07/18] lib/stackdepot: lower the indentation in stack_depot_init

On Mon, Jan 30, 2023 at 9:50 PM <[email protected]> wrote:
>
> From: Andrey Konovalov <[email protected]>
>
> stack_depot_init does most things inside an if check. Move them out and
> use a goto statement instead.
>
> No functional changes.
>
> Signed-off-by: Andrey Konovalov <[email protected]>
Reviewed-by: Alexander Potapenko <[email protected]>