tools headers UAPI: Sync openat2.h with the kernel sources

[linux-2.6-microblaze.git] / lib / stackdepot.c

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 890dcc2..49f67a0 100644 (file)
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -31,6 +31,7 @@
 #include <linux/stackdepot.h>
 #include <linux/string.h>
 #include <linux/types.h>
+#include <linux/memblock.h>
 
 #define DEPOT_STACK_BITS (sizeof(depot_stack_handle_t) * 8)
 
@@ -141,14 +142,38 @@ static struct stack_record *depot_alloc_stack(unsigned long *entries, int size,
        return stack;
 }
 
-#define STACK_HASH_ORDER 20
-#define STACK_HASH_SIZE (1L << STACK_HASH_ORDER)
+#define STACK_HASH_SIZE (1L << CONFIG_STACK_HASH_ORDER)
 #define STACK_HASH_MASK (STACK_HASH_SIZE - 1)
 #define STACK_HASH_SEED 0x9747b28c
 
-static struct stack_record *stack_table[STACK_HASH_SIZE] = {
-       [0 ...  STACK_HASH_SIZE - 1] = NULL
-};
+static bool stack_depot_disable;
+static struct stack_record **stack_table;
+
+static int __init is_stack_depot_disabled(char *str)
+{
+       int ret;
+
+       ret = kstrtobool(str, &stack_depot_disable);
+       if (!ret && stack_depot_disable) {
+               pr_info("Stack Depot is disabled\n");
+               stack_table = NULL;
+       }
+       return 0;
+}
+early_param("stack_depot_disable", is_stack_depot_disabled);
+
+int __init stack_depot_init(void)
+{
+       if (!stack_depot_disable) {
+               size_t size = (STACK_HASH_SIZE * sizeof(struct stack_record *));
+               int i;
+
+               stack_table = memblock_alloc(size, size);
+               for (i = 0; i < STACK_HASH_SIZE;  i++)
+                       stack_table[i] = NULL;
+       }
+       return 0;
+}
 
 /* Calculate hash for a stack */
 static inline u32 hash_stack(unsigned long *entries, unsigned int size)
@@ -242,7 +267,7 @@ depot_stack_handle_t stack_depot_save(unsigned long *entries,
        unsigned long flags;
        u32 hash;
 
-       if (unlikely(nr_entries == 0))
+       if (unlikely(nr_entries == 0) || stack_depot_disable)
                goto fast_exit;
 
        hash = hash_stack(entries, nr_entries);