The patch titled
Subject: lib/stackdepot: rename next_pool_required to new_pool_required
has been added to the -mm mm-unstable branch. Its filename is
lib-stackdepot-rename-next_pool_required-to-new_pool_required.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/lib-stackdepot-rename-next_pool_required-to-new_pool_required.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Subject: lib/stackdepot: rename next_pool_required to new_pool_required
Date: Mon, 20 Nov 2023 18:47:07 +0100
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.
Link: https://lkml.kernel.org/r/fd7cd6c6eb250c13ec5d2009d75bb4ddd1470db9.1700502145.git.andreyknvl@xxxxxxxxxx
Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Reviewed-by: Alexander Potapenko <glider@xxxxxxxxxx>
Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
Cc: Evgenii Stepanov <eugenis@xxxxxxxxxx>
Cc: Marco Elver <elver@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
lib/stackdepot.c | 49 ++++++++++++++++++++++-----------------------
1 file changed, 24 insertions(+), 25 deletions(-)
--- a/lib/stackdepot.c~lib-stackdepot-rename-next_pool_required-to-new_pool_required
+++ a/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 @@ out_unlock:
}
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 **
}
/*
- * 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 re
}
/*
- * 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 re
/*
* 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 re
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
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(
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(
} 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);
_
Patches currently in -mm which might be from andreyknvl@xxxxxxxxxx are
lib-stackdepot-print-disabled-message-only-if-truly-disabled.patch
lib-stackdepot-check-disabled-flag-when-fetching.patch
lib-stackdepot-simplify-__stack_depot_save.patch
lib-stackdepot-drop-valid-bit-from-handles.patch
lib-stackdepot-add-depot_fetch_stack-helper.patch
lib-stackdepot-use-fixed-sized-slots-for-stack-records.patch
lib-stackdepot-fix-and-clean-up-atomic-annotations.patch
lib-stackdepot-rework-helpers-for-depot_alloc_stack.patch
lib-stackdepot-rename-next_pool_required-to-new_pool_required.patch
lib-stackdepot-store-next-pool-pointer-in-new_pool.patch
lib-stackdepot-store-free-stack-records-in-a-freelist.patch
lib-stackdepot-use-read-write-lock.patch
lib-stackdepot-use-list_head-for-stack-record-links.patch
kmsan-use-stack_depot_save-instead-of-__stack_depot_save.patch
lib-stackdepot-kasan-add-flags-to-__stack_depot_save-and-rename.patch
lib-stackdepot-add-refcount-for-records.patch
lib-stackdepot-allow-users-to-evict-stack-traces.patch
kasan-remove-atomic-accesses-to-stack-ring-entries.patch
kasan-check-object_size-in-kasan_complete_mode_report_info.patch
kasan-use-stack_depot_put-for-tag-based-modes.patch
kasan-use-stack_depot_put-for-generic-mode.patch
lib-stackdepot-adjust-depot_pools_cap-for-kmsan.patch
