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Message-Id: <fd7cd6c6eb250c13ec5d2009d75bb4ddd1470db9.1700502145.git.andreyknvl@google.com>
Date: Mon, 20 Nov 2023 18:47:07 +0100
From: andrey.konovalov@...ux.dev
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrey Konovalov <andreyknvl@...il.com>,
Marco Elver <elver@...gle.com>,
Alexander Potapenko <glider@...gle.com>,
Dmitry Vyukov <dvyukov@...gle.com>,
Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
Evgenii Stepanov <eugenis@...gle.com>,
Oscar Salvador <osalvador@...e.de>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH v4 09/22] lib/stackdepot: rename next_pool_required to new_pool_required
From: Andrey Konovalov <andreyknvl@...gle.com>
Rename next_pool_required to new_pool_required.
This a purely code readability change: the following patch will change
stack depot to store the pointer to the new pool in a separate variable,
and "new" seems like a more logical name.
Reviewed-by: Alexander Potapenko <glider@...gle.com>
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
lib/stackdepot.c | 49 ++++++++++++++++++++++++------------------------
1 file changed, 24 insertions(+), 25 deletions(-)
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index b3af868627f4..a38661beab97 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -93,12 +93,11 @@ static size_t pool_offset;
static DEFINE_RAW_SPINLOCK(pool_lock);
/*
* Stack depot tries to keep an extra pool allocated even before it runs out
- * of space in the currently used pool.
- * This flag marks that this next extra pool needs to be allocated and
- * initialized. It has the value 0 when either the next pool is not yet
- * initialized or the limit on the number of pools is reached.
+ * of space in the currently used pool. This flag marks whether this extra pool
+ * needs to be allocated. It has the value 0 when either an extra pool is not
+ * yet allocated or if the limit on the number of pools is reached.
*/
-static int next_pool_required = 1;
+static int new_pool_required = 1;
static int __init disable_stack_depot(char *str)
{
@@ -225,20 +224,20 @@ int stack_depot_init(void)
}
EXPORT_SYMBOL_GPL(stack_depot_init);
-/* Keeps the preallocated memory to be used for the next stack depot pool. */
-static void depot_keep_next_pool(void **prealloc)
+/* Keeps the preallocated memory to be used for a new stack depot pool. */
+static void depot_keep_new_pool(void **prealloc)
{
/*
- * If the next pool is already saved or the maximum number of
+ * If a new pool is already saved or the maximum number of
* pools is reached, do not use the preallocated memory.
- * Access next_pool_required non-atomically, as there are no concurrent
+ * Access new_pool_required non-atomically, as there are no concurrent
* write accesses to this variable.
*/
- if (!next_pool_required)
+ if (!new_pool_required)
return;
/*
- * Use the preallocated memory for the next pool
+ * Use the preallocated memory for the new pool
* as long as we do not exceed the maximum number of pools.
*/
if (pool_index + 1 < DEPOT_MAX_POOLS) {
@@ -247,13 +246,13 @@ static void depot_keep_next_pool(void **prealloc)
}
/*
- * At this point, either the next pool is kept or the maximum
+ * At this point, either a new pool is kept or the maximum
* number of pools is reached. In either case, take note that
* keeping another pool is not required.
* smp_store_release() pairs with smp_load_acquire() in
* stack_depot_save().
*/
- smp_store_release(&next_pool_required, 0);
+ smp_store_release(&new_pool_required, 0);
}
/* Updates references to the current and the next stack depot pools. */
@@ -268,7 +267,7 @@ static bool depot_update_pools(size_t required_size, void **prealloc)
}
/*
- * Move on to the next pool.
+ * Move on to the new pool.
* WRITE_ONCE() pairs with potential concurrent read in
* stack_depot_fetch().
*/
@@ -277,12 +276,12 @@ static bool depot_update_pools(size_t required_size, void **prealloc)
/*
* If the maximum number of pools is not reached, take note
- * that the next pool needs to be initialized.
+ * that yet another new pool needs to be allocated.
* smp_store_release() pairs with smp_load_acquire() in
* stack_depot_save().
*/
if (pool_index + 1 < DEPOT_MAX_POOLS)
- smp_store_release(&next_pool_required, 1);
+ smp_store_release(&new_pool_required, 1);
}
/* Check if the current pool is not yet allocated. */
@@ -293,9 +292,9 @@ static bool depot_update_pools(size_t required_size, void **prealloc)
return true;
}
- /* Otherwise, try using the preallocated memory for the next pool. */
+ /* Otherwise, try using the preallocated memory for a new pool. */
if (*prealloc)
- depot_keep_next_pool(prealloc);
+ depot_keep_new_pool(prealloc);
return true;
}
@@ -306,7 +305,7 @@ depot_alloc_stack(unsigned long *entries, int size, u32 hash, void **prealloc)
struct stack_record *stack;
size_t required_size = DEPOT_STACK_RECORD_SIZE;
- /* Update current and next pools if required and possible. */
+ /* Update current and new pools if required and possible. */
if (!depot_update_pools(required_size, prealloc))
return NULL;
@@ -438,13 +437,13 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries,
goto exit;
/*
- * Check if another stack pool needs to be initialized. If so, allocate
- * the memory now - we won't be able to do that under the lock.
+ * Check if another stack pool needs to be allocated. If so, allocate
+ * the memory now: we won't be able to do that under the lock.
*
* smp_load_acquire() pairs with smp_store_release() in
- * depot_update_pools() and depot_keep_next_pool().
+ * depot_update_pools() and depot_keep_new_pool().
*/
- if (unlikely(can_alloc && smp_load_acquire(&next_pool_required))) {
+ if (unlikely(can_alloc && smp_load_acquire(&new_pool_required))) {
/*
* Zero out zone modifiers, as we don't have specific zone
* requirements. Keep the flags related to allocation in atomic
@@ -477,9 +476,9 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries,
} else if (prealloc) {
/*
* Stack depot already contains this stack trace, but let's
- * keep the preallocated memory for the future.
+ * keep the preallocated memory for future.
*/
- depot_keep_next_pool(&prealloc);
+ depot_keep_new_pool(&prealloc);
}
raw_spin_unlock_irqrestore(&pool_lock, flags);
--
2.25.1
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