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tracing: Use hist trigger's var_ref array to destroy var_refs 

Since every var ref for a trigger has an entry in the var_ref[] array,
use that to destroy the var_refs, instead of piecemeal via the field
expressions.

This allows us to avoid having to keep and treat differently separate
lists for the action-related references, which future patches will
remove.

Link: http://lkml.kernel.org/r/fad1a164f0e257c158e70d6eadbf6c586e04b2a2.1545161087.git.tom.zanussi@linux.intel.com

Acked-by: Namhyung Kim <namhyung@kernel.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
This commit is contained in:
Tom Zanussi 2018-12-18 14:33:24 -06:00 committed by Steven Rostedt (VMware)
parent de40f033d4
commit 656fe2ba85
1 changed files with 19 additions and 5 deletions
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24
kernel/trace/trace_events_hist.c
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@ -2190,6 +2190,15 @@ static int contains_operator(char *str)
return field_op;
}
static void __destroy_hist_field(struct hist_field *hist_field)
{
kfree(hist_field->var.name);
kfree(hist_field->name);
kfree(hist_field->type);
kfree(hist_field);
}
static void destroy_hist_field(struct hist_field *hist_field,
unsigned int level)
{
@ -2201,14 +2210,13 @@ static void destroy_hist_field(struct hist_field *hist_field,
if (!hist_field)
return;
if (hist_field->flags & HIST_FIELD_FL_VAR_REF)
return; /* var refs will be destroyed separately */
for (i = 0; i < HIST_FIELD_OPERANDS_MAX; i++)
destroy_hist_field(hist_field->operands[i], level + 1);
kfree(hist_field->var.name);
kfree(hist_field->name);
kfree(hist_field->type);
kfree(hist_field);
__destroy_hist_field(hist_field);
}
static struct hist_field *create_hist_field(struct hist_trigger_data *hist_data,
@ -2335,6 +2343,12 @@ static void destroy_hist_fields(struct hist_trigger_data *hist_data)
hist_data->fields[i] = NULL;
}
}
for (i = 0; i < hist_data->n_var_refs; i++) {
WARN_ON(!(hist_data->var_refs[i]->flags & HIST_FIELD_FL_VAR_REF));
__destroy_hist_field(hist_data->var_refs[i]);
hist_data->var_refs[i] = NULL;
}
}
static int init_var_ref(struct hist_field *ref_field,