Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2)  * Ftrace support for Microblaze.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  * Copyright (C) 2009 Michal Simek <monstr@monstr.eu>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  * Copyright (C) 2009 PetaLogix
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  * Based on MIPS and PowerPC ftrace code
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * This file is subject to the terms and conditions of the GNU General Public
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  * License. See the file "COPYING" in the main directory of this archive
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * for more details.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14) #include <asm/cacheflush.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15) #include <linux/ftrace.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17) #ifdef CONFIG_FUNCTION_GRAPH_TRACER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  * Hook the return address and push it in the stack of return addrs
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20)  * in current thread info.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) 	unsigned long old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) 	int faulted;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) 	unsigned long return_hooker = (unsigned long)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) 				&return_to_handler;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) 	if (unlikely(ftrace_graph_is_dead()))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) 	if (unlikely(atomic_read(&current->tracing_graph_pause)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) 	/*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) 	 * Protect against fault, even if it shouldn't
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 	 * happen. This tool is too much intrusive to
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) 	 * ignore such a protection.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 	asm volatile("	1:	lwi	%0, %2, 0;"		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) 			"2:	swi	%3, %2, 0;"		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 			"	addik	%1, r0, 0;"		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) 			"3:"					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) 			"	.section .fixup, \"ax\";"	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 			"4:	brid	3b;"			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) 			"	addik	%1, r0, 1;"		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) 			"	.previous;"			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) 			"	.section __ex_table,\"a\";"	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) 			"	.word	1b,4b;"			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 			"	.word	2b,4b;"			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 			"	.previous;"			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 			: "=&r" (old), "=r" (faulted)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 			: "r" (parent), "r" (return_hooker)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	flush_dcache_range((u32)parent, (u32)parent + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 	flush_icache_range((u32)parent, (u32)parent + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 	if (unlikely(faulted)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 		ftrace_graph_stop();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 		WARN_ON(1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 		return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	if (function_graph_enter(old, self_addr, 0, NULL))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 		*parent = old;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) #ifdef CONFIG_DYNAMIC_FTRACE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) /* save value to addr - it is save to do it in asm */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) static int ftrace_modify_code(unsigned long addr, unsigned int value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 	int faulted = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) 	__asm__ __volatile__("	1:	swi	%2, %1, 0;"		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 				"	addik	%0, r0, 0;"		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) 				"2:"					\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 				"	.section .fixup, \"ax\";"	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) 				"3:	brid	2b;"			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) 				"	addik	%0, r0, 1;"		\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 				"	.previous;"			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) 				"	.section __ex_table,\"a\";"	\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 				"	.word	1b,3b;"			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) 				"	.previous;"			\
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) 				: "=r" (faulted)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 				: "r" (addr), "r" (value)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 	);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) 	if (unlikely(faulted))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 		return -EFAULT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	flush_dcache_range(addr, addr + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	flush_icache_range(addr, addr + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) #define MICROBLAZE_NOP 0x80000000
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) #define MICROBLAZE_BRI 0xb800000C
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) static unsigned int recorded; /* if save was or not */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) static unsigned int imm; /* saving whole imm instruction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) /* There are two approaches howto solve ftrace_make nop function - look below */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) #undef USE_FTRACE_NOP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) #ifdef USE_FTRACE_NOP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) static unsigned int bralid; /* saving whole bralid instruction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) #endif
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) int ftrace_make_nop(struct module *mod,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 			struct dyn_ftrace *rec, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) 	/* we have this part of code which we are working with
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) 	 * b000c000        imm     -16384
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) 	 * b9fc8e30        bralid  r15, -29136     // c0008e30 <_mcount>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 	 * 80000000        or      r0, r0, r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 	 * The first solution (!USE_FTRACE_NOP-could be called branch solution)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 	 * b000c000        bri	12 (0xC - jump to any other instruction)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 	 * b9fc8e30        bralid  r15, -29136     // c0008e30 <_mcount>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) 	 * 80000000        or      r0, r0, r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 	 * any other instruction
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) 	 *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	 * The second solution (USE_FTRACE_NOP) - no jump just nops
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) 	 * 80000000        or      r0, r0, r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 	 * 80000000        or      r0, r0, r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) 	 * 80000000        or      r0, r0, r0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 	if (recorded == 0) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 		recorded = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 		imm = *(unsigned int *)rec->ip;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 		pr_debug("%s: imm:0x%x\n", __func__, imm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) #ifdef USE_FTRACE_NOP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 		bralid = *(unsigned int *)(rec->ip + 4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 		pr_debug("%s: bralid 0x%x\n", __func__, bralid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) #endif /* USE_FTRACE_NOP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) #ifdef USE_FTRACE_NOP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 	ret = ftrace_modify_code(rec->ip, MICROBLAZE_NOP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) 	ret += ftrace_modify_code(rec->ip + 4, MICROBLAZE_NOP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) #else /* USE_FTRACE_NOP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) 	ret = ftrace_modify_code(rec->ip, MICROBLAZE_BRI);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) #endif /* USE_FTRACE_NOP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) /* I believe that first is called ftrace_make_nop before this function */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) 	int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 	pr_debug("%s: addr:0x%x, rec->ip: 0x%x, imm:0x%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) 		__func__, (unsigned int)addr, (unsigned int)rec->ip, imm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 	ret = ftrace_modify_code(rec->ip, imm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) #ifdef USE_FTRACE_NOP
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 	pr_debug("%s: bralid:0x%x\n", __func__, bralid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 	ret += ftrace_modify_code(rec->ip + 4, bralid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) #endif /* USE_FTRACE_NOP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) int __init ftrace_dyn_arch_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 	return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) int ftrace_update_ftrace_func(ftrace_func_t func)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 	unsigned long ip = (unsigned long)(&ftrace_call);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 	unsigned int upper = (unsigned int)func;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) 	unsigned int lower = (unsigned int)func;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	int ret = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	/* create proper saving to ftrace_call poll */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	upper = 0xb0000000 + (upper >> 16); /* imm func_upper */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	lower = 0x32800000 + (lower & 0xFFFF); /* addik r20, r0, func_lower */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	pr_debug("%s: func=0x%x, ip=0x%x, upper=0x%x, lower=0x%x\n",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 		__func__, (unsigned int)func, (unsigned int)ip, upper, lower);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) 	/* save upper and lower code */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 	ret = ftrace_modify_code(ip, upper);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 	ret += ftrace_modify_code(ip + 4, lower);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 	/* We just need to replace the rtsd r15, 8 with NOP */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) 	ret += ftrace_modify_code((unsigned long)&ftrace_caller,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 				  MICROBLAZE_NOP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) #ifdef CONFIG_FUNCTION_GRAPH_TRACER
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) unsigned int old_jump; /* saving place for jump instruction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) int ftrace_enable_ftrace_graph_caller(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	unsigned int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 	unsigned long ip = (unsigned long)(&ftrace_call_graph);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	old_jump = *(unsigned int *)ip; /* save jump over instruction */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	ret = ftrace_modify_code(ip, MICROBLAZE_NOP);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 	pr_debug("%s: Replace instruction: 0x%x\n", __func__, old_jump);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int ftrace_disable_ftrace_graph_caller(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) 	unsigned int ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 	unsigned long ip = (unsigned long)(&ftrace_call_graph);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 	ret = ftrace_modify_code(ip, old_jump);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) 	pr_debug("%s\n", __func__);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) 	return ret;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) #endif /* CONFIG_DYNAMIC_FTRACE */