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lib/stackdepot: move stack_record struct definition into the header

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In order to move the heavy lifting into page_owner code, this one needs to
have access to the stack_record structure, which right now sits in
lib/stackdepot.c.  Move it to the stackdepot.h header so page_owner can
access stack_record's struct fields.

Link: https://lkml.kernel.org/r/20240215215907.20121-3-osalvador@suse.de
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Reviewed-by: Marco Elver <elver@google.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Michal Hocko <mhocko@suse.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Oscar Salvador 2024-02-15 22:59:02 +01:00 committed by Andrew Morton
parent 3ee34eabac
commit 8151c7a35d
2 changed files with 47 additions and 43 deletions
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47
include/linux/stackdepot.h
View File

@ -30,6 +30,53 @@ typedef u32 depot_stack_handle_t;
*/
#define STACK_DEPOT_EXTRA_BITS 5
#define DEPOT_HANDLE_BITS (sizeof(depot_stack_handle_t) * 8)
#define DEPOT_POOL_ORDER 2 /* Pool size order, 4 pages */
#define DEPOT_POOL_SIZE (1LL << (PAGE_SHIFT + DEPOT_POOL_ORDER))
#define DEPOT_STACK_ALIGN 4
#define DEPOT_OFFSET_BITS (DEPOT_POOL_ORDER + PAGE_SHIFT - DEPOT_STACK_ALIGN)
#define DEPOT_POOL_INDEX_BITS (DEPOT_HANDLE_BITS - DEPOT_OFFSET_BITS - \
STACK_DEPOT_EXTRA_BITS)
#ifdef CONFIG_STACKDEPOT
/* Compact structure that stores a reference to a stack. */
union handle_parts {
depot_stack_handle_t handle;
struct {
/* pool_index is offset by 1 */
u32 pool_index : DEPOT_POOL_INDEX_BITS;
u32 offset : DEPOT_OFFSET_BITS;
u32 extra : STACK_DEPOT_EXTRA_BITS;
};
};
struct stack_record {
struct list_head hash_list; /* Links in the hash table */
u32 hash; /* Hash in hash table */
u32 size; /* Number of stored frames */
union handle_parts handle; /* Constant after initialization */
refcount_t count;
union {
unsigned long entries[CONFIG_STACKDEPOT_MAX_FRAMES]; /* Frames */
struct {
/*
* An important invariant of the implementation is to
* only place a stack record onto the freelist iff its
* refcount is zero. Because stack records with a zero
* refcount are never considered as valid, it is safe to
* union @entries and freelist management state below.
* Conversely, as soon as an entry is off the freelist
* and its refcount becomes non-zero, the below must not
* be accessed until being placed back on the freelist.
*/
struct list_head free_list; /* Links in the freelist */
unsigned long rcu_state; /* RCU cookie */
};
};
};
#endif
typedef u32 depot_flags_t;
/*

43
lib/stackdepot.c
View File

@ -36,55 +36,12 @@
#include <linux/memblock.h>
#include <linux/kasan-enabled.h>
#define DEPOT_HANDLE_BITS (sizeof(depot_stack_handle_t) * 8)
#define DEPOT_POOL_ORDER 2 /* Pool size order, 4 pages */
#define DEPOT_POOL_SIZE (1LL << (PAGE_SHIFT + DEPOT_POOL_ORDER))
#define DEPOT_STACK_ALIGN 4
#define DEPOT_OFFSET_BITS (DEPOT_POOL_ORDER + PAGE_SHIFT - DEPOT_STACK_ALIGN)
#define DEPOT_POOL_INDEX_BITS (DEPOT_HANDLE_BITS - DEPOT_OFFSET_BITS - \
STACK_DEPOT_EXTRA_BITS)
#define DEPOT_POOLS_CAP 8192
/* The pool_index is offset by 1 so the first record does not have a 0 handle. */
#define DEPOT_MAX_POOLS \
(((1LL << (DEPOT_POOL_INDEX_BITS)) - 1 < DEPOT_POOLS_CAP) ? \
(1LL << (DEPOT_POOL_INDEX_BITS)) - 1 : DEPOT_POOLS_CAP)
/* Compact structure that stores a reference to a stack. */
union handle_parts {
depot_stack_handle_t handle;
struct {
u32 pool_index : DEPOT_POOL_INDEX_BITS; /* pool_index is offset by 1 */
u32 offset : DEPOT_OFFSET_BITS;
u32 extra : STACK_DEPOT_EXTRA_BITS;
};
};
struct stack_record {
struct list_head hash_list; /* Links in the hash table */
u32 hash; /* Hash in hash table */
u32 size; /* Number of stored frames */
union handle_parts handle; /* Constant after initialization */
refcount_t count;
union {
unsigned long entries[CONFIG_STACKDEPOT_MAX_FRAMES]; /* Frames */
struct {
/*
* An important invariant of the implementation is to
* only place a stack record onto the freelist iff its
* refcount is zero. Because stack records with a zero
* refcount are never considered as valid, it is safe to
* union @entries and freelist management state below.
* Conversely, as soon as an entry is off the freelist
* and its refcount becomes non-zero, the below must not
* be accessed until being placed back on the freelist.
*/
struct list_head free_list; /* Links in the freelist */
unsigned long rcu_state; /* RCU cookie */
};
};
};
static bool stack_depot_disabled;
static bool __stack_depot_early_init_requested __initdata = IS_ENABLED(CONFIG_STACKDEPOT_ALWAYS_INIT);
static bool __stack_depot_early_init_passed __initdata;