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From: "Naveen N. Rao" <naveen.n.rao@linux.vnet.ibm.com>
To: Steven Rostedt <rostedt@goodmis.org>,
	Michael Ellerman <mpe@ellerman.id.au>,
	Nicholas Piggin <npiggin@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH 3/4] ftrace: Expose __ftrace_replace_code()
Date: Sat, 18 May 2019 00:32:47 +0530
Message-ID: <40a640c1b9d2362b88a9d4b9412242ad396c9c68.1558115654.git.naveen.n.rao@linux.vnet.ibm.com> (raw)
In-Reply-To: <cover.1558115654.git.naveen.n.rao@linux.vnet.ibm.com>

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@linux.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


  parent reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-17 19:02 [RFC PATCH 0/4] Nop out the preceding mflr with -mprofile-kernel Naveen N. Rao
2019-05-17 19:02 ` [RFC PATCH 1/4] ftrace: Expose flags used for ftrace_replace_code() Naveen N. Rao
2019-05-20 13:08   ` Steven Rostedt
2019-05-17 19:02 ` [RFC PATCH 2/4] x86/ftrace: Fix use of flags in ftrace_replace_code() Naveen N. Rao
2019-05-20 13:13   ` Steven Rostedt
2019-05-20 13:44     ` Steven Rostedt
2019-05-20 14:42       ` Naveen N. Rao
2019-05-20 14:55         ` Steven Rostedt
2019-05-17 19:02 ` Naveen N. Rao [this message]
2019-05-17 19:02 ` [RFC PATCH 4/4] powerpc/ftrace: Additionally nop out the preceding mflr with -mprofile-kernel Naveen N. Rao
2019-05-18  2:08   ` Nicholas Piggin
2019-05-20  8:57     ` Naveen N. Rao

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