Signed-off-by: Wang Nan <[email protected]>
---
include/linux/ftrace.h | 5 +++++
kernel/trace/ftrace.c | 15 +++++++++++++++
2 files changed, 20 insertions(+)
diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 8db315a..d37ccd8a 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -702,9 +702,14 @@ static inline void __ftrace_enabled_restore(int enabled)
#ifdef CONFIG_FTRACE_MCOUNT_RECORD
extern void ftrace_init(void);
extern void ftrace_init_early(void);
+extern int ftrace_process_loc_early(unsigned long ip);
#else
static inline void ftrace_init(void) { }
static inline void ftrace_init_early(void) { }
+static inline int ftrace_process_loc_early(unsigned long __unused)
+{
+ return 0;
+}
#endif
/*
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 79b3e88..150762a 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -5028,6 +5028,21 @@ void __init ftrace_init_early(void)
ftrace_sort_mcount_area();
}
+int __init ftrace_process_loc_early(unsigned long addr)
+{
+ unsigned long ip = ftrace_location(addr);
+ struct dyn_ftrace fake_rec;
+ int ret;
+
+ if (ip != addr)
+ return -EINVAL;
+
+ memset(&fake_rec, '\0', sizeof(fake_rec));
+ fake_rec.ip = ip;
+ ret = ftrace_make_nop(NULL, &fake_rec, MCOUNT_ADDR);
+ return ret;
+}
+
/* Do nothing if arch does not support this */
void __weak arch_ftrace_update_trampoline(struct ftrace_ops *ops)
{
--
1.8.4
--
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