Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
ftrace: Export some of hash related functions
We are going to use these functions in following changes.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Reviewed-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Link: https://lore.kernel.org/bpf/20251230145010.103439-4-jolsa@kernel.org
authored by
Jiri Olsa
and committed by
Andrii Nakryiko
0e860d07
676bfeae
+15
-7
+9
include/linux/ftrace.h
+9
include/linux/ftrace.h
···
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struct module;
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struct ftrace_hash;
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+
struct ftrace_func_entry;
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#if defined(CONFIG_FUNCTION_TRACER) && defined(CONFIG_MODULES) && \
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defined(CONFIG_DYNAMIC_FTRACE)
···
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typedef int (*ftrace_ops_func_t)(struct ftrace_ops *op, enum ftrace_ops_cmd cmd);
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#ifdef CONFIG_DYNAMIC_FTRACE
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+
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#define FTRACE_HASH_DEFAULT_BITS 10
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+
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struct ftrace_hash *alloc_ftrace_hash(int size_bits);
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void free_ftrace_hash(struct ftrace_hash *hash);
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struct ftrace_func_entry *add_ftrace_hash_entry_direct(struct ftrace_hash *hash,
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unsigned long ip, unsigned long direct);
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/* The hash used to know what functions callbacks trace */
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struct ftrace_ops_hash {
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struct ftrace_hash __rcu *notrace_hash;
+6
-7
kernel/trace/ftrace.c
+6
-7
kernel/trace/ftrace.c
···
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})
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/* hash bits for specific function selection */
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-
#define FTRACE_HASH_DEFAULT_BITS 10
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#define FTRACE_HASH_MAX_BITS 12
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#ifdef CONFIG_DYNAMIC_FTRACE
···
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hash->count++;
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}
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-
static struct ftrace_func_entry *
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add_hash_entry_direct(struct ftrace_hash *hash, unsigned long ip, unsigned long direct)
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struct ftrace_func_entry *
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add_ftrace_hash_entry_direct(struct ftrace_hash *hash, unsigned long ip, unsigned long direct)
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{
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struct ftrace_func_entry *entry;
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···
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static struct ftrace_func_entry *
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add_hash_entry(struct ftrace_hash *hash, unsigned long ip)
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{
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return add_hash_entry_direct(hash, ip, 0);
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return add_ftrace_hash_entry_direct(hash, ip, 0);
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}
1234
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static void
···
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mutex_unlock(&ftrace_lock);
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}
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-
static void free_ftrace_hash(struct ftrace_hash *hash)
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void free_ftrace_hash(struct ftrace_hash *hash)
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{
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if (!hash || hash == EMPTY_HASH)
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return;
···
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}
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EXPORT_SYMBOL_GPL(ftrace_free_filter);
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-
static struct ftrace_hash *alloc_ftrace_hash(int size_bits)
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struct ftrace_hash *alloc_ftrace_hash(int size_bits)
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{
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struct ftrace_hash *hash;
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int size;
···
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size = 1 << hash->size_bits;
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for (i = 0; i < size; i++) {
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hlist_for_each_entry(entry, &hash->buckets[i], hlist) {
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if (add_hash_entry_direct(new_hash, entry->ip, entry->direct) == NULL)
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if (add_ftrace_hash_entry_direct(new_hash, entry->ip, entry->direct) == NULL)
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goto free_hash;
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}
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}