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Message-Id: <fc73ab8b1469d476363a918cbdfe28e1388c043a.1675111415.git.andreyknvl@google.com>
Date: Mon, 30 Jan 2023 21:49:35 +0100
From: andrey.konovalov@...ux.dev
To: Marco Elver <elver@...gle.com>,
Alexander Potapenko <glider@...gle.com>
Cc: Andrey Konovalov <andreyknvl@...il.com>,
Vlastimil Babka <vbabka@...e.cz>, kasan-dev@...glegroups.com,
Evgenii Stepanov <eugenis@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Andrey Konovalov <andreyknvl@...gle.com>
Subject: [PATCH 11/18] lib/stackdepot: rename slab variables
From: Andrey Konovalov <andreyknvl@...gle.com>
Give better names to slab-related global variables: change "depot_"
prefix to "slab_" to point out that these variables are related to
stack depot slabs.
Also rename the slabindex field in handle_parts to align its name with
the slab_index global variable.
No functional changes.
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
lib/stackdepot.c | 46 +++++++++++++++++++++++-----------------------
1 file changed, 23 insertions(+), 23 deletions(-)
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 69b9316b0d4b..023f299bedf6 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -56,7 +56,7 @@
union handle_parts {
depot_stack_handle_t handle;
struct {
- u32 slabindex : STACK_ALLOC_INDEX_BITS;
+ u32 slab_index : STACK_ALLOC_INDEX_BITS;
u32 offset : STACK_ALLOC_OFFSET_BITS;
u32 valid : STACK_ALLOC_NULL_PROTECTION_BITS;
u32 extra : STACK_DEPOT_EXTRA_BITS;
@@ -93,11 +93,11 @@ static unsigned int stack_hash_mask;
/* Array of memory regions that store stack traces. */
static void *stack_slabs[STACK_ALLOC_MAX_SLABS];
/* Currently used slab in stack_slabs. */
-static int depot_index;
+static int slab_index;
/* Offset to the unused space in the currently used slab. */
-static size_t depot_offset;
+static size_t slab_offset;
/* Lock that protects the variables above. */
-static DEFINE_RAW_SPINLOCK(depot_lock);
+static DEFINE_RAW_SPINLOCK(slab_lock);
/* Whether the next slab is initialized. */
static int next_slab_inited;
@@ -230,13 +230,13 @@ static bool depot_init_slab(void **prealloc)
*/
if (smp_load_acquire(&next_slab_inited))
return true;
- if (stack_slabs[depot_index] == NULL) {
- stack_slabs[depot_index] = *prealloc;
+ if (stack_slabs[slab_index] == NULL) {
+ stack_slabs[slab_index] = *prealloc;
*prealloc = NULL;
} else {
/* If this is the last depot slab, do not touch the next one. */
- if (depot_index + 1 < STACK_ALLOC_MAX_SLABS) {
- stack_slabs[depot_index + 1] = *prealloc;
+ if (slab_index + 1 < STACK_ALLOC_MAX_SLABS) {
+ stack_slabs[slab_index + 1] = *prealloc;
*prealloc = NULL;
/*
* This smp_store_release pairs with smp_load_acquire()
@@ -258,35 +258,35 @@ depot_alloc_stack(unsigned long *entries, int size, u32 hash, void **prealloc)
required_size = ALIGN(required_size, 1 << STACK_ALLOC_ALIGN);
- if (unlikely(depot_offset + required_size > STACK_ALLOC_SIZE)) {
- if (unlikely(depot_index + 1 >= STACK_ALLOC_MAX_SLABS)) {
+ if (unlikely(slab_offset + required_size > STACK_ALLOC_SIZE)) {
+ if (unlikely(slab_index + 1 >= STACK_ALLOC_MAX_SLABS)) {
WARN_ONCE(1, "Stack depot reached limit capacity");
return NULL;
}
- depot_index++;
- depot_offset = 0;
+ slab_index++;
+ slab_offset = 0;
/*
* smp_store_release() here pairs with smp_load_acquire() from
* |next_slab_inited| in stack_depot_save() and
* depot_init_slab().
*/
- if (depot_index + 1 < STACK_ALLOC_MAX_SLABS)
+ if (slab_index + 1 < STACK_ALLOC_MAX_SLABS)
smp_store_release(&next_slab_inited, 0);
}
depot_init_slab(prealloc);
- if (stack_slabs[depot_index] == NULL)
+ if (stack_slabs[slab_index] == NULL)
return NULL;
- stack = stack_slabs[depot_index] + depot_offset;
+ stack = stack_slabs[slab_index] + slab_offset;
stack->hash = hash;
stack->size = size;
- stack->handle.slabindex = depot_index;
- stack->handle.offset = depot_offset >> STACK_ALLOC_ALIGN;
+ stack->handle.slab_index = slab_index;
+ stack->handle.offset = slab_offset >> STACK_ALLOC_ALIGN;
stack->handle.valid = 1;
stack->handle.extra = 0;
memcpy(stack->entries, entries, flex_array_size(stack, entries, size));
- depot_offset += required_size;
+ slab_offset += required_size;
return stack;
}
@@ -418,7 +418,7 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries,
prealloc = page_address(page);
}
- raw_spin_lock_irqsave(&depot_lock, flags);
+ raw_spin_lock_irqsave(&slab_lock, flags);
found = find_stack(*bucket, entries, nr_entries, hash);
if (!found) {
@@ -441,7 +441,7 @@ depot_stack_handle_t __stack_depot_save(unsigned long *entries,
WARN_ON(!depot_init_slab(&prealloc));
}
- raw_spin_unlock_irqrestore(&depot_lock, flags);
+ raw_spin_unlock_irqrestore(&slab_lock, flags);
exit:
if (prealloc) {
/* Nobody used this memory, ok to free it. */
@@ -497,12 +497,12 @@ unsigned int stack_depot_fetch(depot_stack_handle_t handle,
if (!handle)
return 0;
- if (parts.slabindex > depot_index) {
+ if (parts.slab_index > slab_index) {
WARN(1, "slab index %d out of bounds (%d) for stack id %08x\n",
- parts.slabindex, depot_index, handle);
+ parts.slab_index, slab_index, handle);
return 0;
}
- slab = stack_slabs[parts.slabindex];
+ slab = stack_slabs[parts.slab_index];
if (!slab)
return 0;
stack = slab + offset;
--
2.25.1
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