summaryrefslogtreecommitdiff
path: root/kernel/trace/trace.c
diff options
context:
space:
mode:
Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c76
1 files changed, 41 insertions, 35 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index d9293402ee68..a2f0b9f33e9b 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -74,11 +74,6 @@ static struct tracer_opt dummy_tracer_opt[] = {
{ }
};
-static struct tracer_flags dummy_tracer_flags = {
- .val = 0,
- .opts = dummy_tracer_opt
-};
-
static int
dummy_set_flag(struct trace_array *tr, u32 old_flags, u32 bit, int set)
{
@@ -1258,12 +1253,22 @@ int __init register_tracer(struct tracer *type)
if (!type->set_flag)
type->set_flag = &dummy_set_flag;
- if (!type->flags)
- type->flags = &dummy_tracer_flags;
- else
+ if (!type->flags) {
+ /*allocate a dummy tracer_flags*/
+ type->flags = kmalloc(sizeof(*type->flags), GFP_KERNEL);
+ if (!type->flags) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ type->flags->val = 0;
+ type->flags->opts = dummy_tracer_opt;
+ } else
if (!type->flags->opts)
type->flags->opts = dummy_tracer_opt;
+ /* store the tracer for __set_tracer_option */
+ type->flags->trace = type;
+
ret = run_tracer_selftest(type);
if (ret < 0)
goto out;
@@ -1659,6 +1664,7 @@ tracing_generic_entry_update(struct trace_entry *entry, unsigned long flags,
#else
TRACE_FLAG_IRQS_NOSUPPORT |
#endif
+ ((pc & NMI_MASK ) ? TRACE_FLAG_NMI : 0) |
((pc & HARDIRQ_MASK) ? TRACE_FLAG_HARDIRQ : 0) |
((pc & SOFTIRQ_MASK) ? TRACE_FLAG_SOFTIRQ : 0) |
(tif_need_resched() ? TRACE_FLAG_NEED_RESCHED : 0) |
@@ -2071,20 +2077,20 @@ void trace_printk_init_buffers(void)
/* trace_printk() is for debug use only. Don't use it in production. */
- pr_warning("\n");
- pr_warning("**********************************************************\n");
- pr_warning("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
- pr_warning("** **\n");
- pr_warning("** trace_printk() being used. Allocating extra memory. **\n");
- pr_warning("** **\n");
- pr_warning("** This means that this is a DEBUG kernel and it is **\n");
- pr_warning("** unsafe for production use. **\n");
- pr_warning("** **\n");
- pr_warning("** If you see this message and you are not debugging **\n");
- pr_warning("** the kernel, report this immediately to your vendor! **\n");
- pr_warning("** **\n");
- pr_warning("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
- pr_warning("**********************************************************\n");
+ pr_warn("\n");
+ pr_warn("**********************************************************\n");
+ pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
+ pr_warn("** **\n");
+ pr_warn("** trace_printk() being used. Allocating extra memory. **\n");
+ pr_warn("** **\n");
+ pr_warn("** This means that this is a DEBUG kernel and it is **\n");
+ pr_warn("** unsafe for production use. **\n");
+ pr_warn("** **\n");
+ pr_warn("** If you see this message and you are not debugging **\n");
+ pr_warn("** the kernel, report this immediately to your vendor! **\n");
+ pr_warn("** **\n");
+ pr_warn("** NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE NOTICE **\n");
+ pr_warn("**********************************************************\n");
/* Expand the buffers to set size */
tracing_update_buffers();
@@ -3505,7 +3511,7 @@ static int __set_tracer_option(struct trace_array *tr,
struct tracer_flags *tracer_flags,
struct tracer_opt *opts, int neg)
{
- struct tracer *trace = tr->current_trace;
+ struct tracer *trace = tracer_flags->trace;
int ret;
ret = trace->set_flag(tr, tracer_flags->val, opts->bit, !neg);
@@ -4101,7 +4107,7 @@ trace_insert_enum_map_file(struct module *mod, struct trace_enum_map **start,
*/
map_array = kmalloc(sizeof(*map_array) * (len + 2), GFP_KERNEL);
if (!map_array) {
- pr_warning("Unable to allocate trace enum mapping\n");
+ pr_warn("Unable to allocate trace enum mapping\n");
return;
}
@@ -4949,7 +4955,10 @@ static ssize_t tracing_splice_read_pipe(struct file *filp,
spd.nr_pages = i;
- ret = splice_to_pipe(pipe, &spd);
+ if (i)
+ ret = splice_to_pipe(pipe, &spd);
+ else
+ ret = 0;
out:
splice_shrink_spd(&spd);
return ret;
@@ -6131,7 +6140,7 @@ tracing_init_tracefs_percpu(struct trace_array *tr, long cpu)
snprintf(cpu_dir, 30, "cpu%ld", cpu);
d_cpu = tracefs_create_dir(cpu_dir, d_percpu);
if (!d_cpu) {
- pr_warning("Could not create tracefs '%s' entry\n", cpu_dir);
+ pr_warn("Could not create tracefs '%s' entry\n", cpu_dir);
return;
}
@@ -6318,7 +6327,7 @@ struct dentry *trace_create_file(const char *name,
ret = tracefs_create_file(name, mode, parent, data, fops);
if (!ret)
- pr_warning("Could not create tracefs '%s' entry\n", name);
+ pr_warn("Could not create tracefs '%s' entry\n", name);
return ret;
}
@@ -6337,7 +6346,7 @@ static struct dentry *trace_options_init_dentry(struct trace_array *tr)
tr->options = tracefs_create_dir("options", d_tracer);
if (!tr->options) {
- pr_warning("Could not create tracefs directory 'options'\n");
+ pr_warn("Could not create tracefs directory 'options'\n");
return NULL;
}
@@ -6391,11 +6400,8 @@ create_trace_option_files(struct trace_array *tr, struct tracer *tracer)
return;
for (i = 0; i < tr->nr_topts; i++) {
- /*
- * Check if these flags have already been added.
- * Some tracers share flags.
- */
- if (tr->topts[i].tracer->flags == tracer->flags)
+ /* Make sure there's no duplicate flags. */
+ if (WARN_ON_ONCE(tr->topts[i].tracer->flags == tracer->flags))
return;
}
@@ -7248,8 +7254,8 @@ __init static int tracer_alloc_buffers(void)
if (trace_boot_clock) {
ret = tracing_set_clock(&global_trace, trace_boot_clock);
if (ret < 0)
- pr_warning("Trace clock %s not defined, going back to default\n",
- trace_boot_clock);
+ pr_warn("Trace clock %s not defined, going back to default\n",
+ trace_boot_clock);
}
/*
generated by cgit v1.2.3 (git 2.39.0) at 2025-11-04 04:25:32 +0300