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Message-Id: <632393332c364171c69b7c054b3b2233acbfa996.1675111415.git.andreyknvl@google.com>
Date: Mon, 30 Jan 2023 21:49:26 +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 02/18] lib/stackdepot: put functions in logical order
From: Andrey Konovalov <andreyknvl@...gle.com>
Put stack depot functions' declarations and definitions in a more logical
order:
1. Functions that save stack traces into stack depot.
2. Functions that fetch and print stack traces.
3. stack_depot_get_extra_bits that operates on stack depot handles
and does not interact with the stack depot storage.
No functional changes.
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
include/linux/stackdepot.h | 15 +-
lib/stackdepot.c | 316 ++++++++++++++++++-------------------
2 files changed, 166 insertions(+), 165 deletions(-)
diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h
index 9ca7798d7a31..1296a6eeaec0 100644
--- a/include/linux/stackdepot.h
+++ b/include/linux/stackdepot.h
@@ -14,17 +14,13 @@
#include <linux/gfp.h>
typedef u32 depot_stack_handle_t;
+
/*
* Number of bits in the handle that stack depot doesn't use. Users may store
* information in them.
*/
#define STACK_DEPOT_EXTRA_BITS 5
-depot_stack_handle_t __stack_depot_save(unsigned long *entries,
- unsigned int nr_entries,
- unsigned int extra_bits,
- gfp_t gfp_flags, bool can_alloc);
-
/*
* Every user of stack depot has to call stack_depot_init() during its own init
* when it's decided that it will be calling stack_depot_save() later. This is
@@ -59,17 +55,22 @@ static inline void stack_depot_want_early_init(void) { }
static inline int stack_depot_early_init(void) { return 0; }
#endif
+depot_stack_handle_t __stack_depot_save(unsigned long *entries,
+ unsigned int nr_entries,
+ unsigned int extra_bits,
+ gfp_t gfp_flags, bool can_alloc);
+
depot_stack_handle_t stack_depot_save(unsigned long *entries,
unsigned int nr_entries, gfp_t gfp_flags);
unsigned int stack_depot_fetch(depot_stack_handle_t handle,
unsigned long **entries);
-unsigned int stack_depot_get_extra_bits(depot_stack_handle_t handle);
+void stack_depot_print(depot_stack_handle_t stack);
int stack_depot_snprint(depot_stack_handle_t handle, char *buf, size_t size,
int spaces);
-void stack_depot_print(depot_stack_handle_t stack);
+unsigned int stack_depot_get_extra_bits(depot_stack_handle_t handle);
#endif
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 0eed9bbcf23e..23d2a68a587b 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -79,85 +79,6 @@ static int next_slab_inited;
static size_t depot_offset;
static DEFINE_RAW_SPINLOCK(depot_lock);
-unsigned int stack_depot_get_extra_bits(depot_stack_handle_t handle)
-{
- union handle_parts parts = { .handle = handle };
-
- return parts.extra;
-}
-EXPORT_SYMBOL(stack_depot_get_extra_bits);
-
-static bool init_stack_slab(void **prealloc)
-{
- if (!*prealloc)
- return false;
- /*
- * This smp_load_acquire() pairs with smp_store_release() to
- * |next_slab_inited| below and in depot_alloc_stack().
- */
- if (smp_load_acquire(&next_slab_inited))
- return true;
- if (stack_slabs[depot_index] == NULL) {
- stack_slabs[depot_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;
- *prealloc = NULL;
- /*
- * This smp_store_release pairs with smp_load_acquire()
- * from |next_slab_inited| above and in
- * stack_depot_save().
- */
- smp_store_release(&next_slab_inited, 1);
- }
- }
- return true;
-}
-
-/* Allocation of a new stack in raw storage */
-static struct stack_record *
-depot_alloc_stack(unsigned long *entries, int size, u32 hash, void **prealloc)
-{
- struct stack_record *stack;
- size_t required_size = struct_size(stack, entries, size);
-
- 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)) {
- WARN_ONCE(1, "Stack depot reached limit capacity");
- return NULL;
- }
- depot_index++;
- depot_offset = 0;
- /*
- * smp_store_release() here pairs with smp_load_acquire() from
- * |next_slab_inited| in stack_depot_save() and
- * init_stack_slab().
- */
- if (depot_index + 1 < STACK_ALLOC_MAX_SLABS)
- smp_store_release(&next_slab_inited, 0);
- }
- init_stack_slab(prealloc);
- if (stack_slabs[depot_index] == NULL)
- return NULL;
-
- stack = stack_slabs[depot_index] + depot_offset;
-
- stack->hash = hash;
- stack->size = size;
- stack->handle.slabindex = depot_index;
- stack->handle.offset = depot_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;
-
- return stack;
-}
-
/* one hash table bucket entry per 16kB of memory */
#define STACK_HASH_SCALE 14
/* limited between 4k and 1M buckets */
@@ -271,6 +192,77 @@ int stack_depot_init(void)
}
EXPORT_SYMBOL_GPL(stack_depot_init);
+static bool init_stack_slab(void **prealloc)
+{
+ if (!*prealloc)
+ return false;
+ /*
+ * This smp_load_acquire() pairs with smp_store_release() to
+ * |next_slab_inited| below and in depot_alloc_stack().
+ */
+ if (smp_load_acquire(&next_slab_inited))
+ return true;
+ if (stack_slabs[depot_index] == NULL) {
+ stack_slabs[depot_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;
+ *prealloc = NULL;
+ /*
+ * This smp_store_release pairs with smp_load_acquire()
+ * from |next_slab_inited| above and in
+ * stack_depot_save().
+ */
+ smp_store_release(&next_slab_inited, 1);
+ }
+ }
+ return true;
+}
+
+/* Allocation of a new stack in raw storage */
+static struct stack_record *
+depot_alloc_stack(unsigned long *entries, int size, u32 hash, void **prealloc)
+{
+ struct stack_record *stack;
+ size_t required_size = struct_size(stack, entries, size);
+
+ 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)) {
+ WARN_ONCE(1, "Stack depot reached limit capacity");
+ return NULL;
+ }
+ depot_index++;
+ depot_offset = 0;
+ /*
+ * smp_store_release() here pairs with smp_load_acquire() from
+ * |next_slab_inited| in stack_depot_save() and
+ * init_stack_slab().
+ */
+ if (depot_index + 1 < STACK_ALLOC_MAX_SLABS)
+ smp_store_release(&next_slab_inited, 0);
+ }
+ init_stack_slab(prealloc);
+ if (stack_slabs[depot_index] == NULL)
+ return NULL;
+
+ stack = stack_slabs[depot_index] + depot_offset;
+
+ stack->hash = hash;
+ stack->size = size;
+ stack->handle.slabindex = depot_index;
+ stack->handle.offset = depot_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;
+
+ return stack;
+}
+
/* Calculate hash for a stack */
static inline u32 hash_stack(unsigned long *entries, unsigned int size)
{
@@ -310,85 +302,6 @@ static inline struct stack_record *find_stack(struct stack_record *bucket,
return NULL;
}
-/**
- * stack_depot_snprint - print stack entries from a depot into a buffer
- *
- * @handle: Stack depot handle which was returned from
- * stack_depot_save().
- * @buf: Pointer to the print buffer
- *
- * @size: Size of the print buffer
- *
- * @spaces: Number of leading spaces to print
- *
- * Return: Number of bytes printed.
- */
-int stack_depot_snprint(depot_stack_handle_t handle, char *buf, size_t size,
- int spaces)
-{
- unsigned long *entries;
- unsigned int nr_entries;
-
- nr_entries = stack_depot_fetch(handle, &entries);
- return nr_entries ? stack_trace_snprint(buf, size, entries, nr_entries,
- spaces) : 0;
-}
-EXPORT_SYMBOL_GPL(stack_depot_snprint);
-
-/**
- * stack_depot_print - print stack entries from a depot
- *
- * @stack: Stack depot handle which was returned from
- * stack_depot_save().
- *
- */
-void stack_depot_print(depot_stack_handle_t stack)
-{
- unsigned long *entries;
- unsigned int nr_entries;
-
- nr_entries = stack_depot_fetch(stack, &entries);
- if (nr_entries > 0)
- stack_trace_print(entries, nr_entries, 0);
-}
-EXPORT_SYMBOL_GPL(stack_depot_print);
-
-/**
- * stack_depot_fetch - Fetch stack entries from a depot
- *
- * @handle: Stack depot handle which was returned from
- * stack_depot_save().
- * @entries: Pointer to store the entries address
- *
- * Return: The number of trace entries for this depot.
- */
-unsigned int stack_depot_fetch(depot_stack_handle_t handle,
- unsigned long **entries)
-{
- union handle_parts parts = { .handle = handle };
- void *slab;
- size_t offset = parts.offset << STACK_ALLOC_ALIGN;
- struct stack_record *stack;
-
- *entries = NULL;
- if (!handle)
- return 0;
-
- if (parts.slabindex > depot_index) {
- WARN(1, "slab index %d out of bounds (%d) for stack id %08x\n",
- parts.slabindex, depot_index, handle);
- return 0;
- }
- slab = stack_slabs[parts.slabindex];
- if (!slab)
- return 0;
- stack = slab + offset;
-
- *entries = stack->entries;
- return stack->size;
-}
-EXPORT_SYMBOL_GPL(stack_depot_fetch);
-
/**
* __stack_depot_save - Save a stack trace from an array
*
@@ -534,3 +447,90 @@ depot_stack_handle_t stack_depot_save(unsigned long *entries,
return __stack_depot_save(entries, nr_entries, 0, alloc_flags, true);
}
EXPORT_SYMBOL_GPL(stack_depot_save);
+
+/**
+ * stack_depot_fetch - Fetch stack entries from a depot
+ *
+ * @handle: Stack depot handle which was returned from
+ * stack_depot_save().
+ * @entries: Pointer to store the entries address
+ *
+ * Return: The number of trace entries for this depot.
+ */
+unsigned int stack_depot_fetch(depot_stack_handle_t handle,
+ unsigned long **entries)
+{
+ union handle_parts parts = { .handle = handle };
+ void *slab;
+ size_t offset = parts.offset << STACK_ALLOC_ALIGN;
+ struct stack_record *stack;
+
+ *entries = NULL;
+ if (!handle)
+ return 0;
+
+ if (parts.slabindex > depot_index) {
+ WARN(1, "slab index %d out of bounds (%d) for stack id %08x\n",
+ parts.slabindex, depot_index, handle);
+ return 0;
+ }
+ slab = stack_slabs[parts.slabindex];
+ if (!slab)
+ return 0;
+ stack = slab + offset;
+
+ *entries = stack->entries;
+ return stack->size;
+}
+EXPORT_SYMBOL_GPL(stack_depot_fetch);
+
+/**
+ * stack_depot_print - print stack entries from a depot
+ *
+ * @stack: Stack depot handle which was returned from
+ * stack_depot_save().
+ *
+ */
+void stack_depot_print(depot_stack_handle_t stack)
+{
+ unsigned long *entries;
+ unsigned int nr_entries;
+
+ nr_entries = stack_depot_fetch(stack, &entries);
+ if (nr_entries > 0)
+ stack_trace_print(entries, nr_entries, 0);
+}
+EXPORT_SYMBOL_GPL(stack_depot_print);
+
+/**
+ * stack_depot_snprint - print stack entries from a depot into a buffer
+ *
+ * @handle: Stack depot handle which was returned from
+ * stack_depot_save().
+ * @buf: Pointer to the print buffer
+ *
+ * @size: Size of the print buffer
+ *
+ * @spaces: Number of leading spaces to print
+ *
+ * Return: Number of bytes printed.
+ */
+int stack_depot_snprint(depot_stack_handle_t handle, char *buf, size_t size,
+ int spaces)
+{
+ unsigned long *entries;
+ unsigned int nr_entries;
+
+ nr_entries = stack_depot_fetch(handle, &entries);
+ return nr_entries ? stack_trace_snprint(buf, size, entries, nr_entries,
+ spaces) : 0;
+}
+EXPORT_SYMBOL_GPL(stack_depot_snprint);
+
+unsigned int stack_depot_get_extra_bits(depot_stack_handle_t handle)
+{
+ union handle_parts parts = { .handle = handle };
+
+ return parts.extra;
+}
+EXPORT_SYMBOL(stack_depot_get_extra_bits);
--
2.25.1
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