Messages in this thread Patch in this message | | | From | Yuntao Wang <> | Subject | [PATCH] tracing: Use trace_create_file() to simplify creation of tracefs entry | Date | Fri, 14 Jan 2022 00:25:13 +0800 |
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Creating tracefs entries with tracefs_create_file() followed by pr_warn() is tedious and repetitive, we can use trace_create_file() to simplify this process and make the code more readable.
Signed-off-by: Yuntao Wang <ytcoode@gmail.com> --- kernel/trace/ftrace.c | 17 +++++------- kernel/trace/trace.c | 16 ++++++------ kernel/trace/trace_dynevent.c | 8 ++---- kernel/trace/trace_events.c | 37 ++++++++++----------------- kernel/trace/trace_hwlat.c | 2 +- kernel/trace/trace_kprobe.c | 14 +++------- kernel/trace/trace_osnoise.c | 2 +- kernel/trace/trace_printk.c | 2 +- kernel/trace/trace_recursion_record.c | 7 ++--- kernel/trace/trace_stack.c | 4 +-- kernel/trace/trace_uprobe.c | 4 +-- 11 files changed, 44 insertions(+), 69 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c index 403e485bf091..3c5e3838772d 100644 --- a/kernel/trace/ftrace.c +++ b/kernel/trace/ftrace.c @@ -983,11 +983,9 @@ static __init void ftrace_profile_tracefs(struct dentry *d_tracer) } } - entry = tracefs_create_file("function_profile_enabled", - TRACE_MODE_WRITE, d_tracer, NULL, - &ftrace_profile_fops); - if (!entry) - pr_warn("Could not create tracefs 'function_profile_enabled' entry\n"); + trace_create_file("function_profile_enabled", + TRACE_MODE_WRITE, d_tracer, NULL, + &ftrace_profile_fops); } #else /* CONFIG_FUNCTION_PROFILER */ @@ -6366,11 +6364,10 @@ static __init int ftrace_init_dyn_tracefs(struct dentry *d_tracer) #ifdef CONFIG_FUNCTION_GRAPH_TRACER trace_create_file("set_graph_function", TRACE_MODE_WRITE, d_tracer, - NULL, - &ftrace_graph_fops); + NULL, &ftrace_graph_fops); + trace_create_file("set_graph_notrace", TRACE_MODE_WRITE, d_tracer, - NULL, - &ftrace_graph_notrace_fops); + NULL, &ftrace_graph_notrace_fops); #endif /* CONFIG_FUNCTION_GRAPH_TRACER */ return 0; @@ -7744,7 +7741,7 @@ static const struct file_operations ftrace_no_pid_fops = { void ftrace_init_tracefs(struct trace_array *tr, struct dentry *d_tracer) { trace_create_file("set_ftrace_pid", TRACE_MODE_WRITE, d_tracer, - tr, &ftrace_pid_fops); + tr, &ftrace_pid_fops); trace_create_file("set_ftrace_notrace_pid", TRACE_MODE_WRITE, d_tracer, tr, &ftrace_no_pid_fops); } diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index a73d78dcda2c..5d66e79f43e7 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -9422,10 +9422,10 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer) int cpu; trace_create_file("available_tracers", TRACE_MODE_READ, d_tracer, - tr, &show_traces_fops); + tr, &show_traces_fops); trace_create_file("current_tracer", TRACE_MODE_WRITE, d_tracer, - tr, &set_tracer_fops); + tr, &set_tracer_fops); trace_create_file("tracing_cpumask", TRACE_MODE_WRITE, d_tracer, tr, &tracing_cpumask_fops); @@ -9472,7 +9472,7 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer) tr->buffer_percent = 50; trace_create_file("buffer_percent", TRACE_MODE_READ, d_tracer, - tr, &buffer_percent_fops); + tr, &buffer_percent_fops); create_trace_options_dir(tr); @@ -9680,19 +9680,19 @@ static __init int tracer_init_tracefs(void) ftrace_init_tracefs_toplevel(&global_trace, NULL); trace_create_file("tracing_thresh", TRACE_MODE_WRITE, NULL, - &global_trace, &tracing_thresh_fops); + &global_trace, &tracing_thresh_fops); trace_create_file("README", TRACE_MODE_READ, NULL, - NULL, &tracing_readme_fops); + NULL, &tracing_readme_fops); trace_create_file("saved_cmdlines", TRACE_MODE_READ, NULL, - NULL, &tracing_saved_cmdlines_fops); + NULL, &tracing_saved_cmdlines_fops); trace_create_file("saved_cmdlines_size", TRACE_MODE_WRITE, NULL, NULL, &tracing_saved_cmdlines_size_fops); trace_create_file("saved_tgids", TRACE_MODE_READ, NULL, - NULL, &tracing_saved_tgids_fops); + NULL, &tracing_saved_tgids_fops); trace_eval_init(); @@ -9704,7 +9704,7 @@ static __init int tracer_init_tracefs(void) #ifdef CONFIG_DYNAMIC_FTRACE trace_create_file("dyn_ftrace_total_info", TRACE_MODE_READ, NULL, - NULL, &tracing_dyn_info_fops); + NULL, &tracing_dyn_info_fops); #endif create_trace_instances(NULL); diff --git a/kernel/trace/trace_dynevent.c b/kernel/trace/trace_dynevent.c index e34e8182ee4b..6f6ee1d9e247 100644 --- a/kernel/trace/trace_dynevent.c +++ b/kernel/trace/trace_dynevent.c @@ -262,12 +262,8 @@ static __init int init_dynamic_event(void) if (ret) return 0; - entry = tracefs_create_file("dynamic_events", TRACE_MODE_WRITE, NULL, - NULL, &dynamic_events_ops); - - /* Event list interface */ - if (!entry) - pr_warn("Could not create tracefs 'dynamic_events' entry\n"); + trace_create_file("dynamic_events", TRACE_MODE_WRITE, NULL, + NULL, &dynamic_events_ops); return 0; } diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c index 3147614c1812..408f8a8a7723 100644 --- a/kernel/trace/trace_events.c +++ b/kernel/trace/trace_events.c @@ -3446,12 +3446,10 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) struct dentry *d_events; struct dentry *entry; - entry = tracefs_create_file("set_event", TRACE_MODE_WRITE, parent, - tr, &ftrace_set_event_fops); - if (!entry) { - pr_warn("Could not create tracefs 'set_event' entry\n"); + entry = trace_create_file("set_event", TRACE_MODE_WRITE, parent, + tr, &ftrace_set_event_fops); + if (!entry) return -ENOMEM; - } d_events = tracefs_create_dir("events", parent); if (!d_events) { @@ -3466,25 +3464,21 @@ create_event_toplevel_files(struct dentry *parent, struct trace_array *tr) /* There are not as crucial, just warn if they are not created */ - entry = tracefs_create_file("set_event_pid", TRACE_MODE_WRITE, parent, - tr, &ftrace_set_event_pid_fops); - if (!entry) - pr_warn("Could not create tracefs 'set_event_pid' entry\n"); + trace_create_file("set_event_pid", TRACE_MODE_WRITE, parent, + tr, &ftrace_set_event_pid_fops); - entry = tracefs_create_file("set_event_notrace_pid", - TRACE_MODE_WRITE, parent, tr, - &ftrace_set_event_notrace_pid_fops); - if (!entry) - pr_warn("Could not create tracefs 'set_event_notrace_pid' entry\n"); + trace_create_file("set_event_notrace_pid", + TRACE_MODE_WRITE, parent, tr, + &ftrace_set_event_notrace_pid_fops); /* ring buffer internal formats */ trace_create_file("header_page", TRACE_MODE_READ, d_events, - ring_buffer_print_page_header, - &ftrace_show_header_fops); + ring_buffer_print_page_header, + &ftrace_show_header_fops); trace_create_file("header_event", TRACE_MODE_READ, d_events, - ring_buffer_print_entry_header, - &ftrace_show_header_fops); + ring_buffer_print_entry_header, + &ftrace_show_header_fops); tr->event_dir = d_events; @@ -3690,17 +3684,14 @@ static __init int event_trace_init_fields(void) __init int event_trace_init(void) { struct trace_array *tr; - struct dentry *entry; int ret; tr = top_trace_array(); if (!tr) return -ENODEV; - entry = tracefs_create_file("available_events", TRACE_MODE_READ, - NULL, tr, &ftrace_avail_fops); - if (!entry) - pr_warn("Could not create tracefs 'available_events' entry\n"); + trace_create_file("available_events", TRACE_MODE_READ, + NULL, tr, &ftrace_avail_fops); ret = early_event_add_tracer(NULL, tr); if (ret) diff --git a/kernel/trace/trace_hwlat.c b/kernel/trace/trace_hwlat.c index 56bb7b890578..7bab09a6bd0a 100644 --- a/kernel/trace/trace_hwlat.c +++ b/kernel/trace/trace_hwlat.c @@ -796,7 +796,7 @@ static int init_tracefs(void) if (!hwlat_sample_width) goto err; - hwlat_thread_mode = trace_create_file("mode", TRACE_MODE_WRITE, + hwlat_thread_mode = tracefs_create_file("mode", TRACE_MODE_WRITE, top_dir, NULL, &thread_mode_fops); diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 3d85323278ed..d13826ea490b 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -1912,19 +1912,13 @@ static __init int init_kprobe_trace(void) if (ret) return 0; - entry = tracefs_create_file("kprobe_events", TRACE_MODE_WRITE, - NULL, NULL, &kprobe_events_ops); - /* Event list interface */ - if (!entry) - pr_warn("Could not create tracefs 'kprobe_events' entry\n"); + trace_create_file("kprobe_events", TRACE_MODE_WRITE, + NULL, NULL, &kprobe_events_ops); /* Profile interface */ - entry = tracefs_create_file("kprobe_profile", TRACE_MODE_READ, - NULL, NULL, &kprobe_profile_ops); - - if (!entry) - pr_warn("Could not create tracefs 'kprobe_profile' entry\n"); + trace_create_file("kprobe_profile", TRACE_MODE_READ, + NULL, NULL, &kprobe_profile_ops); setup_boot_kprobe_events(); diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c index 36d9d5be08b4..d0aa23bcbf85 100644 --- a/kernel/trace/trace_osnoise.c +++ b/kernel/trace/trace_osnoise.c @@ -2075,7 +2075,7 @@ static int init_tracefs(void) if (!tmp) goto err; - tmp = trace_create_file("cpus", TRACE_MODE_WRITE, top_dir, NULL, &cpus_fops); + tmp = tracefs_create_file("cpus", TRACE_MODE_WRITE, top_dir, NULL, &cpus_fops); if (!tmp) goto err; diff --git a/kernel/trace/trace_printk.c b/kernel/trace/trace_printk.c index 29f6e95439b6..5422ac74537a 100644 --- a/kernel/trace/trace_printk.c +++ b/kernel/trace/trace_printk.c @@ -385,7 +385,7 @@ static __init int init_trace_printk_function_export(void) return 0; trace_create_file("printk_formats", TRACE_MODE_READ, NULL, - NULL, &ftrace_formats_fops); + NULL, &ftrace_formats_fops); return 0; } diff --git a/kernel/trace/trace_recursion_record.c b/kernel/trace/trace_recursion_record.c index 4d4b78c8ca25..a520b11afb0d 100644 --- a/kernel/trace/trace_recursion_record.c +++ b/kernel/trace/trace_recursion_record.c @@ -224,12 +224,9 @@ static const struct file_operations recursed_functions_fops = { __init static int create_recursed_functions(void) { - struct dentry *dentry; - dentry = trace_create_file("recursed_functions", TRACE_MODE_WRITE, - NULL, NULL, &recursed_functions_fops); - if (!dentry) - pr_warn("WARNING: Failed to create recursed_functions\n"); + trace_create_file("recursed_functions", TRACE_MODE_WRITE, + NULL, NULL, &recursed_functions_fops); return 0; } diff --git a/kernel/trace/trace_stack.c b/kernel/trace/trace_stack.c index 5a48dba912ea..2337470e9ae0 100644 --- a/kernel/trace/trace_stack.c +++ b/kernel/trace/trace_stack.c @@ -560,10 +560,10 @@ static __init int stack_trace_init(void) return 0; trace_create_file("stack_max_size", TRACE_MODE_WRITE, NULL, - &stack_trace_max_size, &stack_max_size_fops); + &stack_trace_max_size, &stack_max_size_fops); trace_create_file("stack_trace", TRACE_MODE_READ, NULL, - NULL, &stack_trace_fops); + NULL, &stack_trace_fops); #ifdef CONFIG_DYNAMIC_FTRACE trace_create_file("stack_trace_filter", TRACE_MODE_WRITE, NULL, diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c index 08b0e8417302..58feb4ab34d1 100644 --- a/kernel/trace/trace_uprobe.c +++ b/kernel/trace/trace_uprobe.c @@ -1652,10 +1652,10 @@ static __init int init_uprobe_trace(void) return 0; trace_create_file("uprobe_events", TRACE_MODE_WRITE, NULL, - NULL, &uprobe_events_ops); + NULL, &uprobe_events_ops); /* Profile interface */ trace_create_file("uprobe_profile", TRACE_MODE_READ, NULL, - NULL, &uprobe_profile_ops); + NULL, &uprobe_profile_ops); return 0; } -- 2.34.1
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