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Date: Mon, 15 Aug 2022 13:26:09 -0400 From: Kent Overstreet <kent.overstreet@...ux.dev> To: akpm@...ux-foundation.org Cc: linux-kernel@...r.kernel.org, Kent Overstreet <kent.overstreet@...il.com>, Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...hat.com> Subject: [PATCH 07/11] tracing: trace_events_synth: Convert to printbuf From: Kent Overstreet <kent.overstreet@...il.com> This converts from seq_buf to printbuf. This code was using seq_buf for building up dynamically allocated strings; the conversion uses printbuf's heap allocation functionality to simplify things (no longer need to calculate size of the output string). Also, alphabetize the #includes. Signed-off-by: Kent Overstreet <kent.overstreet@...il.com> Cc: Steven Rostedt <rostedt@...dmis.org> Cc: Ingo Molnar <mingo@...hat.com> --- kernel/trace/trace_events_synth.c | 51 ++++++++++--------------------- 1 file changed, 16 insertions(+), 35 deletions(-) diff --git a/kernel/trace/trace_events_synth.c b/kernel/trace/trace_events_synth.c index 5e8c07aef0..720c75429c 100644 --- a/kernel/trace/trace_events_synth.c +++ b/kernel/trace/trace_events_synth.c @@ -5,13 +5,14 @@ * Copyright (C) 2015, 2020 Tom Zanussi <tom.zanussi@...ux.intel.com> */ -#include <linux/module.h> #include <linux/kallsyms.h> -#include <linux/security.h> +#include <linux/module.h> #include <linux/mutex.h> +#include <linux/printbuf.h> +#include <linux/rculist.h> +#include <linux/security.h> #include <linux/slab.h> #include <linux/stacktrace.h> -#include <linux/rculist.h> #include <linux/tracefs.h> /* for gfp flag names */ @@ -611,7 +612,7 @@ static struct synth_field *parse_synth_field(int argc, char **argv, const char *prefix = NULL, *field_type = argv[0], *field_name, *array; struct synth_field *field; int len, ret = -ENOMEM; - struct seq_buf s; + struct printbuf buf; ssize_t size; if (!strcmp(field_type, "unsigned")) { @@ -654,28 +655,16 @@ static struct synth_field *parse_synth_field(int argc, char **argv, goto free; } - len = strlen(field_type) + 1; - - if (array) - len += strlen(array); - - if (prefix) - len += strlen(prefix); - - field->type = kzalloc(len, GFP_KERNEL); - if (!field->type) - goto free; - - seq_buf_init(&s, field->type, len); + buf = PRINTBUF; if (prefix) - seq_buf_puts(&s, prefix); - seq_buf_puts(&s, field_type); + prt_str(&buf, prefix); + prt_str(&buf, field_type); if (array) - seq_buf_puts(&s, array); - if (WARN_ON_ONCE(!seq_buf_buffer_left(&s))) + prt_str(&buf, array); + if (buf.allocation_failure) goto free; - s.buffer[s.len] = '\0'; + field->type = buf.buf; size = synth_field_size(field->type); if (size < 0) { @@ -687,23 +676,15 @@ static struct synth_field *parse_synth_field(int argc, char **argv, goto free; } else if (size == 0) { if (synth_field_is_string(field->type)) { - char *type; - - len = sizeof("__data_loc ") + strlen(field->type) + 1; - type = kzalloc(len, GFP_KERNEL); - if (!type) - goto free; - - seq_buf_init(&s, type, len); - seq_buf_puts(&s, "__data_loc "); - seq_buf_puts(&s, field->type); + buf = PRINTBUF; + prt_str(&buf, "__data_loc "); + prt_str(&buf, field->type); - if (WARN_ON_ONCE(!seq_buf_buffer_left(&s))) + if (buf.allocation_failure) goto free; - s.buffer[s.len] = '\0'; kfree(field->type); - field->type = type; + field->type = buf.buf; field->is_dynamic = true; size = sizeof(u64); -- 2.36.1
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