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lib/stackdepot: reorder and annotate global variables 

Group stack depot global variables by their purpose:

1. Hash table-related variables,
2. Slab-related variables,

and add comments.

Also clean up comments for hash table-related constants.

Link: https://lkml.kernel.org/r/5606a6c70659065a25bee59cd10e57fc60bb4110.1676063693.git.andreyknvl@google.com
Signed-off-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Alexander Potapenko <glider@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Andrey Konovalov 2023-02-10 22:15:55 +01:00 committed by Andrew Morton
parent c60324fbf0
commit 0d249ac0e0
1 changed files with 17 additions and 10 deletions
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27
lib/stackdepot.c
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@ -75,24 +75,31 @@ 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;
static void *stack_slabs[STACK_ALLOC_MAX_SLABS];
static int depot_index;
static int next_slab_inited;
static size_t depot_offset;
static DEFINE_RAW_SPINLOCK(depot_lock);
/* one hash table bucket entry per 16kB of memory */
/* Use one hash table bucket per 16 KB of memory. */
#define STACK_HASH_SCALE 14
/* limited between 4k and 1M buckets */
/* Limit the number of buckets between 4K and 1M. */
#define STACK_HASH_ORDER_MIN 12
#define STACK_HASH_ORDER_MAX 20
/* Initial seed for jhash2. */
#define STACK_HASH_SEED 0x9747b28c
/* Hash table of pointers to stored stack traces. */
static struct stack_record **stack_table;
/* Fixed order of the number of table buckets. Used when KASAN is enabled. */
static unsigned int stack_hash_order;
/* Hash mask for indexing the table. */
static unsigned int stack_hash_mask;
static struct stack_record **stack_table;
/* 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;
/* Offset to the unused space in the currently used slab. */
static size_t depot_offset;
/* Lock that protects the variables above. */
static DEFINE_RAW_SPINLOCK(depot_lock);
/* Whether the next slab is initialized. */
static int next_slab_inited;
static int __init disable_stack_depot(char *str)
{