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Message-Id: <4ed1d0828e837e15566a7cfa7688a47006e3f4b3.1675111415.git.andreyknvl@google.com>
Date: Mon, 30 Jan 2023 21:49:32 +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 08/18] lib/stackdepot: reorder and annotate global variables
From: Andrey Konovalov <andreyknvl@...gle.com>
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.
Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
lib/stackdepot.c | 27 +++++++++++++++++----------
1 file changed, 17 insertions(+), 10 deletions(-)
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index cb098bc99286..89aee133303a 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -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)
{
--
2.25.1
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