linux-kernel - [PATCH v2 3/7] ftrace: Expose __ftrace_replace

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Message-Id: <0d09c94f19332b13707109f41cd15b6e0c45d120.1561634177.git.naveen.n.rao@linux.vnet.ibm.com>
Date:   Thu, 27 Jun 2019 16:53:51 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 3/7] ftrace: Expose __ftrace_replace_code()

While over-riding ftrace_replace_code(), we still want to reuse the
existing __ftrace_replace_code() function. Rename the function and
make it available for other kernel code.

Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
---
 include/linux/ftrace.h | 1 +
 kernel/trace/ftrace.c  | 8 ++++----
 2 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index e97789c95c4e..fa653a561da5 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -456,6 +456,7 @@ ftrace_set_early_filter(struct ftrace_ops *ops, char *buf, int enable);
 /* defined in arch */
 extern int ftrace_ip_converted(unsigned long ip);
 extern int ftrace_dyn_arch_init(void);
+extern int ftrace_replace_code_rec(struct dyn_ftrace *rec, int enable);
 extern void ftrace_replace_code(int enable);
 extern int ftrace_update_ftrace_func(ftrace_func_t func);
 extern void ftrace_caller(void);
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 5710a6b3edc1..21d8e201ee80 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2351,8 +2351,8 @@ unsigned long ftrace_get_addr_curr(struct dyn_ftrace *rec)
 		return (unsigned long)FTRACE_ADDR;
 }
 
-static int
-__ftrace_replace_code(struct dyn_ftrace *rec, int enable)
+int
+ftrace_replace_code_rec(struct dyn_ftrace *rec, int enable)
 {
 	unsigned long ftrace_old_addr;
 	unsigned long ftrace_addr;
@@ -2403,7 +2403,7 @@ void __weak ftrace_replace_code(int mod_flags)
 		if (rec->flags & FTRACE_FL_DISABLED)
 			continue;
 
-		failed = __ftrace_replace_code(rec, enable);
+		failed = ftrace_replace_code_rec(rec, enable);
 		if (failed) {
 			ftrace_bug(failed, rec);
 			/* Stop processing */
@@ -5827,7 +5827,7 @@ void ftrace_module_enable(struct module *mod)
 		rec->flags = cnt;
 
 		if (ftrace_start_up && cnt) {
-			int failed = __ftrace_replace_code(rec, 1);
+			int failed = ftrace_replace_code_rec(rec, 1);
 			if (failed) {
 				ftrace_bug(failed, rec);
 				goto out_loop;
-- 
2.22.0