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committed 2ee5b92a259ftrace_trace_onoff_callback(struct trace_array *tr, struct ftrace_hash *hash,// SPDX-License-Identifier: GPL-2.0/* * ring buffer based function tracer * * Copyright (C) 2007-2008 Steven Rostedt <srostedt@redhat.com> * Copyright (C) 2008 Ingo Molnar <mingo@redhat.com> * * Based on code from the latency_tracer, that is: * * Copyright (C) 2004-2006 Ingo Molnar * Copyright (C) 2004 Nadia Yvette Chambers */static void tracing_start_function_trace(struct trace_array *tr);static void tracing_stop_function_trace(struct trace_array *tr);static voidfunction_trace_call(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct pt_regs *pt_regs);static voidfunction_stack_trace_call(unsigned long ip, unsigned long parent_ip, struct ftrace_ops *op, struct pt_regs *pt_regs);static struct tracer_flags func_flags;/* Our option */enum { TRACE_FUNC_OPT_STACK = 0x1,};static int allocate_ftrace_ops(struct trace_array *tr){ struct ftrace_ops *ops; ops = kzalloc(sizeof(*ops), GFP_KERNEL); if (!ops) return -ENOMEM; /* Currently only the non stack verision is supported */ ops->func = function_trace_call; ops->flags = FTRACE_OPS_FL_RECURSION_SAFE | FTRACE_OPS_FL_PID; tr->ops = ops; ops->private = tr; return 0;}int ftrace_create_function_files(struct trace_array *tr, struct dentry *parent){ int ret; /* * The top level array uses the "global_ops", and the files are * created on boot up. */ if (tr->flags & TRACE_ARRAY_FL_GLOBAL) return 0; ret = allocate_ftrace_ops(tr); if (ret) return ret; ftrace_create_filter_files(tr->ops, parent); return 0;}void ftrace_destroy_function_files(struct trace_array *tr){ ftrace_destroy_filter_files(tr->ops); kfree(tr->ops); tr->ops = NULL;}static int function_trace_init(struct trace_array *tr){ ftrace_func_t func; /* * Instance trace_arrays get their ops allocated * at instance creation. Unless it failed * the allocation. */ if (!tr->ops)