linux-kernel - [PATCH 1/5] LoongArch: Fix build error if CONFIG_DYNAMIC_FTRACE_WITH

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Message-Id: <1682473754-25077-2-git-send-email-tangyouling@loongson.cn>
Date:   Wed, 26 Apr 2023 09:49:10 +0800
From:   Youling Tang <tangyouling@...ngson.cn>
To:     Huacai Chen <chenhuacai@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>
Cc:     WANG Xuerui <kernel@...0n.name>, linux-kernel@...r.kernel.org,
        linux-trace-kernel@...r.kernel.org, loongarch@...ts.linux.dev,
        loongson-kernel@...ts.loongnix.cn
Subject: [PATCH 1/5] LoongArch: Fix build error if CONFIG_DYNAMIC_FTRACE_WITH_REGS is not set

We can see the following build error on LoongArch if CONFIG_DYNAMIC_FTRACE_WITH_REGS
is not set:

arch/loongarch/kernel/ftrace_dyn.c: In function ‘ftrace_make_call’:
arch/loongarch/kernel/ftrace_dyn.c:167:23: error: implicit declaration of function ‘__get_mod’
  167 |                 ret = __get_mod(&mod, pc);
      |                       ^~~~~~~~~
arch/loongarch/kernel/ftrace_dyn.c:171:24: error: implicit declaration of function ‘get_plt_addr’
  171 |                 addr = get_plt_addr(mod, addr);
      |                        ^~~~~~~~~~~~

The reason is that the __get_mod and get_plt_addr functions will be called
in ftrace_make_{call,nop}.

Signed-off-by: Youling Tang <tangyouling@...ngson.cn>
---
 arch/loongarch/kernel/ftrace_dyn.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/arch/loongarch/kernel/ftrace_dyn.c b/arch/loongarch/kernel/ftrace_dyn.c
index 4a3ef8516ccc..c5f4b4681ddc 100644
--- a/arch/loongarch/kernel/ftrace_dyn.c
+++ b/arch/loongarch/kernel/ftrace_dyn.c
@@ -30,8 +30,6 @@ static int ftrace_modify_code(unsigned long pc, u32 old, u32 new, bool validate)
 	return 0;
 }
 
-#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
-
 #ifdef CONFIG_MODULES
 static inline int __get_mod(struct module **mod, unsigned long addr)
 {
@@ -72,6 +70,7 @@ static unsigned long get_plt_addr(struct module *mod, unsigned long addr)
 }
 #endif
 
+#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
 int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, unsigned long addr)
 {
 	u32 old, new;
@@ -102,7 +101,6 @@ int ftrace_modify_call(struct dyn_ftrace *rec, unsigned long old_addr, unsigned
 
 	return ftrace_modify_code(pc, old, new, true);
 }
-
 #endif /* CONFIG_DYNAMIC_FTRACE_WITH_REGS */
 
 int ftrace_update_ftrace_func(ftrace_func_t func)
-- 
2.37.1