[PATCHv3 bpf-next 7/8] ftrace: Factor ftrace_ops ops_func interface

Jiri Olsa
2025-11-20T21:25:26Z

We are going to remove "ftrace_ops->private == bpf_trampoline" setup
in following changes.

Adding ip argument to ftrace_ops_func_t callback function, so we can
use it to look up the trampoline.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
include/linux/ftrace.h | 2 +-
kernel/bpf/trampoline.c | 3 ++-
kernel/trace/ftrace.c | 6 +++---
3 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 4e2c0ed769fc..5aa37dec0081 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -402,7 +402,7 @@ enum ftrace_ops_cmd {
* Negative on failure. The return value is dependent on the
* callback.
*/
-typedef int (*ftrace_ops_func_t)(struct ftrace_ops *op, enum ftrace_ops_cmd cmd);
+typedef int (*ftrace_ops_func_t)(struct ftrace_ops *op, unsigned long ip, enum ftrace_ops_cmd cmd);

#ifdef CONFIG_DYNAMIC_FTRACE

diff --git a/kernel/bpf/trampoline.c b/kernel/bpf/trampoline.c
index f33693061c2e..d8762f7990ed 100644
--- a/kernel/bpf/trampoline.c
+++ b/kernel/bpf/trampoline.c
@@ -33,7 +33,8 @@ static DEFINE_MUTEX(trampoline_mutex);
#ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
static int bpf_trampoline_update(struct bpf_trampoline *tr, bool lock_direct_mutex);

-static int bpf_tramp_ftrace_ops_func(struct ftrace_ops *ops, enum ftrace_ops_cmd cmd)
+static int bpf_tramp_ftrace_ops_func(struct ftrace_ops *ops, unsigned long ip,
+ enum ftrace_ops_cmd cmd)
{
struct bpf_trampoline *tr = ops->private;
int ret = 0;
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 5243aefb6096..b0e4d7a5d47c 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2049,7 +2049,7 @@ static int __ftrace_hash_update_ipmodify(struct ftrace_ops *ops,
*/
if (!ops->ops_func)
return -EBUSY;
- ret = ops->ops_func(ops, FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_SELF);
+ ret = ops->ops_func(ops, rec->ip, FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_SELF);
if (ret)
return ret;
} else if (is_ipmodify) {
@@ -8976,7 +8976,7 @@ static int prepare_direct_functions_for_ipmodify(struct ftrace_ops *ops)
if (!op->ops_func)
return -EBUSY;

- ret = op->ops_func(op, FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_PEER);
+ ret = op->ops_func(op, ip, FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY_PEER);
if (ret)
return ret;
}
@@ -9023,7 +9023,7 @@ static void cleanup_direct_functions_after_ipmodify(struct ftrace_ops *ops)

/* The cleanup is optional, ignore any errors */
if (found_op && op->ops_func)
- op->ops_func(op, FTRACE_OPS_CMD_DISABLE_SHARE_IPMODIFY_PEER);
+ op->ops_func(op, ip, FTRACE_OPS_CMD_DISABLE_SHARE_IPMODIFY_PEER);
}
}
mutex_unlock(&direct_mutex);
--
2.51.1