uprobes/tracing: Make seq_printf() code uretprobe-friendly
Change probes_seq_show() and print_uprobe_event() to check
is_ret_probe() and print the correct data.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Tested-by: Anton Arapov <anton@redhat.com>
diff --git a/kernel/trace/trace_uprobe.c b/kernel/trace/trace_uprobe.c
index 4575762..8c9f489 100644
--- a/kernel/trace/trace_uprobe.c
+++ b/kernel/trace/trace_uprobe.c
@@ -435,9 +435,10 @@
static int probes_seq_show(struct seq_file *m, void *v)
{
struct trace_uprobe *tu = v;
+ char c = is_ret_probe(tu) ? 'r' : 'p';
int i;
- seq_printf(m, "p:%s/%s", tu->call.class->system, tu->call.name);
+ seq_printf(m, "%c:%s/%s", c, tu->call.class->system, tu->call.name);
seq_printf(m, " %s:0x%p", tu->filename, (void *)tu->offset);
for (i = 0; i < tu->nr_args; i++)
@@ -566,10 +567,18 @@
entry = (struct uprobe_trace_entry_head *)iter->ent;
tu = container_of(event, struct trace_uprobe, call.event);
- if (!trace_seq_printf(s, "%s: (0x%lx)", tu->call.name, entry->vaddr[0]))
- goto partial;
+ if (is_ret_probe(tu)) {
+ if (!trace_seq_printf(s, "%s: (0x%lx <- 0x%lx)", tu->call.name,
+ entry->vaddr[1], entry->vaddr[0]))
+ goto partial;
+ data = DATAOF_TRACE_ENTRY(entry, true);
+ } else {
+ if (!trace_seq_printf(s, "%s: (0x%lx)", tu->call.name,
+ entry->vaddr[0]))
+ goto partial;
+ data = DATAOF_TRACE_ENTRY(entry, false);
+ }
- data = DATAOF_TRACE_ENTRY(entry, false);
for (i = 0; i < tu->nr_args; i++) {
if (!tu->args[i].type->print(s, tu->args[i].name,
data + tu->args[i].offset, entry))
