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kprobes/tracing: Use trace_seq_has_overflowed() for overflow checks

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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.

Link: http://lkml.kernel.org/r/20141114011411.181812785@goodmis.org

Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-11-12 15:18:16 -05:00 committed by Steven Rostedt
parent 9d9add34ec
commit 85224da0b8
1 changed files with 16 additions and 26 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
kernel/trace/trace_kprobe.c
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@ -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_putc(s, ')'))
goto partial;
trace_seq_putc(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_putc(s, '\n'))
goto partial;
return TRACE_TYPE_HANDLED;
partial:
return TRACE_TYPE_PARTIAL_LINE;
trace_seq_putc(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_putc(s, ')'))
goto partial;
trace_seq_putc(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_putc(s, '\n'))
goto partial;
trace_seq_putc(s, '\n');
return TRACE_TYPE_HANDLED;
partial:
return TRACE_TYPE_PARTIAL_LINE;
out:
return trace_handle_return(s);
}