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ftrace: Add ftrace_add_rec_direct function

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Factor out the code that adds (ip, addr) tuple to direct_functions
hash in new ftrace_add_rec_direct function. It will be used in
following patches.

Link: https://lkml.kernel.org/r/20211008091336.33616-6-jolsa@kernel.org

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Jiri Olsa 2021-10-08 11:13:33 +02:00 committed by Steven Rostedt (VMware)
parent 4e341cad6b
commit 1904a81445
1 changed files with 37 additions and 27 deletions
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64
kernel/trace/ftrace.c
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@ -2390,6 +2390,39 @@ unsigned long ftrace_find_rec_direct(unsigned long ip)
return entry->direct;
}
static struct ftrace_func_entry*
ftrace_add_rec_direct(unsigned long ip, unsigned long addr,
struct ftrace_hash **free_hash)
{
struct ftrace_func_entry *entry;
if (ftrace_hash_empty(direct_functions) ||
direct_functions->count > 2 * (1 << direct_functions->size_bits)) {
struct ftrace_hash *new_hash;
int size = ftrace_hash_empty(direct_functions) ? 0 :
direct_functions->count + 1;
if (size < 32)
size = 32;
new_hash = dup_hash(direct_functions, size);
if (!new_hash)
return NULL;
*free_hash = direct_functions;
direct_functions = new_hash;
}
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
return NULL;
entry->ip = ip;
entry->direct = addr;
__add_hash_entry(direct_functions, entry);
return entry;
}
static void call_direct_funcs(unsigned long ip, unsigned long pip,
struct ftrace_ops *ops, struct ftrace_regs *fregs)
{
@ -5106,39 +5139,16 @@ int register_ftrace_direct(unsigned long ip, unsigned long addr)
}
ret = -ENOMEM;
if (ftrace_hash_empty(direct_functions) ||
direct_functions->count > 2 * (1 << direct_functions->size_bits)) {
struct ftrace_hash *new_hash;
int size = ftrace_hash_empty(direct_functions) ? 0 :
direct_functions->count + 1;
if (size < 32)
size = 32;
new_hash = dup_hash(direct_functions, size);
if (!new_hash)
goto out_unlock;
free_hash = direct_functions;
direct_functions = new_hash;
}
entry = kmalloc(sizeof(*entry), GFP_KERNEL);
if (!entry)
goto out_unlock;
direct = ftrace_find_direct_func(addr);
if (!direct) {
direct = ftrace_alloc_direct_func(addr);
if (!direct) {
kfree(entry);
if (!direct)
goto out_unlock;
}
}
entry->ip = ip;
entry->direct = addr;
__add_hash_entry(direct_functions, entry);
entry = ftrace_add_rec_direct(ip, addr, &free_hash);
if (!entry)
goto out_unlock;
ret = ftrace_set_filter_ip(&direct_ops, ip, 0, 0);
if (ret)