[RFC][PATCH 07/23 v4] kprobes/tracing: Use trace_seq_has_overflowed() for overflow checks

From: Steven Rostedt
Date: Thu Nov 13 2014 - 20:22:00 EST


From: "Steven Rostedt (Red Hat)" <rostedt@xxxxxxxxxxx>

Instead of checking the return value of trace_seq_printf() and friends
for overflowing of the buffer, use the trace_seq_has_overflowed() helper
function.

This cleans up the code quite a bit and also takes us a step closer to
changing the return values of trace_seq_printf() and friends to void.

Cc: Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
kernel/trace/trace_kprobe.c | 42 ++++++++++++++++--------------------------
1 file changed, 16 insertions(+), 26 deletions(-)

diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
index 282f6e4e5539..be14b2f091c8 100644
--- a/kernel/trace/trace_kprobe.c
+++ b/kernel/trace/trace_kprobe.c
@@ -1024,27 +1024,22 @@ print_kprobe_event(struct trace_iterator *iter, int flags,
field = (struct kprobe_trace_entry_head *)iter->ent;
tp = container_of(event, struct trace_probe, call.event);

- if (!trace_seq_printf(s, "%s: (", ftrace_event_name(&tp->call)))
- goto partial;
+ trace_seq_printf(s, "%s: (", ftrace_event_name(&tp->call));

if (!seq_print_ip_sym(s, field->ip, flags | TRACE_ITER_SYM_OFFSET))
- goto partial;
+ goto out;

- if (!trace_seq_puts(s, ")"))
- goto partial;
+ trace_seq_puts(s, ")");

data = (u8 *)&field[1];
for (i = 0; i < tp->nr_args; i++)
if (!tp->args[i].type->print(s, tp->args[i].name,
data + tp->args[i].offset, field))
- goto partial;
-
- if (!trace_seq_puts(s, "\n"))
- goto partial;
+ goto out;

- return TRACE_TYPE_HANDLED;
-partial:
- return TRACE_TYPE_PARTIAL_LINE;
+ trace_seq_puts(s, "\n");
+ out:
+ return trace_handle_return(s);
}

static enum print_line_t
@@ -1060,33 +1055,28 @@ print_kretprobe_event(struct trace_iterator *iter, int flags,
field = (struct kretprobe_trace_entry_head *)iter->ent;
tp = container_of(event, struct trace_probe, call.event);

- if (!trace_seq_printf(s, "%s: (", ftrace_event_name(&tp->call)))
- goto partial;
+ trace_seq_printf(s, "%s: (", ftrace_event_name(&tp->call));

if (!seq_print_ip_sym(s, field->ret_ip, flags | TRACE_ITER_SYM_OFFSET))
- goto partial;
+ goto out;

- if (!trace_seq_puts(s, " <- "))
- goto partial;
+ trace_seq_puts(s, " <- ");

if (!seq_print_ip_sym(s, field->func, flags & ~TRACE_ITER_SYM_OFFSET))
- goto partial;
+ goto out;

- if (!trace_seq_puts(s, ")"))
- goto partial;
+ trace_seq_puts(s, ")");

data = (u8 *)&field[1];
for (i = 0; i < tp->nr_args; i++)
if (!tp->args[i].type->print(s, tp->args[i].name,
data + tp->args[i].offset, field))
- goto partial;
+ goto out;

- if (!trace_seq_puts(s, "\n"))
- goto partial;
+ trace_seq_puts(s, "\n");

- return TRACE_TYPE_HANDLED;
-partial:
- return TRACE_TYPE_PARTIAL_LINE;
+ out:
+ return trace_handle_return(s);
}


--
2.1.1


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