linux-kernel - [RFC PATCH 3/4] ftrace: Expose __ftrace_replace

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Message-Id: <40a640c1b9d2362b88a9d4b9412242ad396c9c68.1558115654.git.naveen.n.rao@linux.vnet.ibm.com>
Date:   Sat, 18 May 2019 00:32:47 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     <linuxppc-dev@...ts.ozlabs.org>, <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH 3/4] 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 835e761f63b0..3f4ceb982214 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_do_replace_code(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 38c15cd27fc4..d94f7e526c33 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -2354,8 +2354,8 @@ 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_do_replace_code(struct dyn_ftrace *rec, int enable)
 {
 	unsigned long ftrace_old_addr;
 	unsigned long ftrace_addr;
@@ -2406,7 +2406,7 @@ void __weak ftrace_replace_code(int mod_flags)
 		if (rec->flags & FTRACE_FL_DISABLED)
 			continue;
 
-		failed = __ftrace_replace_code(rec, enable);
+		failed = ftrace_do_replace_code(rec, enable);
 		if (failed) {
 			ftrace_bug(failed, rec);
 			/* Stop processing */
@@ -5822,7 +5822,7 @@ 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_do_replace_code(rec, 1);
 			if (failed) {
 				ftrace_bug(failed, rec);
 				goto out_loop;
-- 
2.21.0