riscv: ftrace factor out code defined by !WITH_ARG

DYNAMIC_FTRACE selects DYNAMIC_FTRACE_WITH_ARGS and mcount-dyn.S in
riscv, so we can remove ifdef jargons of WITH_ARG when it is known that
DYNAMIC_FTRACE is true.

Signed-off-by: Andy Chiu <andybnac@gmail.com>
Link: https://lore.kernel.org/r/20250407180838.42877-2-andybnac@gmail.com
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>

Author: AndybnACT

arch/riscv/kernel/ftrace.c

@@ -210,7 +210,6 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
 }
 
 #ifdef CONFIG_DYNAMIC_FTRACE
-#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
 void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
 		       struct ftrace_ops *op, struct ftrace_regs *fregs)
 {
@@ -231,19 +230,5 @@ void ftrace_graph_func(unsigned long ip, unsigned long parent_ip,
 	if (!function_graph_enter_regs(old, ip, frame_pointer, parent, fregs))
 		*parent = return_hooker;
 }
-#else /* CONFIG_DYNAMIC_FTRACE_WITH_ARGS */
-extern void ftrace_graph_call(void);
-int ftrace_enable_ftrace_graph_caller(void)
-{
-	return __ftrace_modify_call((unsigned long)&ftrace_graph_call,
-				    (unsigned long)&prepare_ftrace_return, true, true);
-}
-
-int ftrace_disable_ftrace_graph_caller(void)
-{
-	return __ftrace_modify_call((unsigned long)&ftrace_graph_call,
-				    (unsigned long)&prepare_ftrace_return, false, true);
-}
-#endif /* CONFIG_DYNAMIC_FTRACE_WITH_ARGS */
 #endif /* CONFIG_DYNAMIC_FTRACE */
 #endif /* CONFIG_FUNCTION_GRAPH_TRACER */

arch/riscv/kernel/mcount-dyn.S

@@ -56,8 +56,6 @@
 	addi	sp, sp, ABI_SIZE_ON_STACK
 	.endm
 
-#ifdef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
-
 /**
 * SAVE_ABI_REGS - save regs against the ftrace_regs struct
 *
@@ -149,36 +147,6 @@
 	mv	a3, sp
 	.endm
 
-#endif /* CONFIG_DYNAMIC_FTRACE_WITH_ARGS */
-
-#ifndef CONFIG_DYNAMIC_FTRACE_WITH_ARGS
-SYM_FUNC_START(ftrace_caller)
-	SAVE_ABI
-
-	addi	a0, t0, -FENTRY_RA_OFFSET
-	la	a1, function_trace_op
-	REG_L	a2, 0(a1)
-	mv	a1, ra
-	mv	a3, sp
-
-SYM_INNER_LABEL(ftrace_call, SYM_L_GLOBAL)
-	call	ftrace_stub
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-	addi	a0, sp, ABI_RA
-	REG_L	a1, ABI_T0(sp)
-	addi	a1, a1, -FENTRY_RA_OFFSET
-#ifdef HAVE_FUNCTION_GRAPH_FP_TEST
-	mv	a2, s0
-#endif
-SYM_INNER_LABEL(ftrace_graph_call, SYM_L_GLOBAL)
-	call	ftrace_stub
-#endif
-	RESTORE_ABI
-	jr	t0
-SYM_FUNC_END(ftrace_caller)
-
-#else /* CONFIG_DYNAMIC_FTRACE_WITH_ARGS */
 SYM_FUNC_START(ftrace_caller)
 	mv	t1, zero
 	SAVE_ABI_REGS
@@ -194,8 +162,6 @@ SYM_INNER_LABEL(ftrace_call, SYM_L_GLOBAL)
 	jr	t1
 SYM_FUNC_END(ftrace_caller)
 
-#endif /* CONFIG_DYNAMIC_FTRACE_WITH_ARGS */
-
 #ifdef CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS
 SYM_CODE_START(ftrace_stub_direct_tramp)
 	jr	t0