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tracing: Do not use return values of trace_seq_printf() in syscall tracing

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The functions trace_seq_printf() and friends will not be returning values
soon and will be void functions. To know if they succeeded or not, the
functions trace_seq_has_overflowed() and trace_handle_return() should be
used instead.

Reviewed-by: Petr Mladek <pmladek@suse.cz>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-11-12 17:41:33 -05:00 committed by Steven Rostedt
parent 8579a107a6
commit 183742f08c
1 changed files with 19 additions and 28 deletions
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47
kernel/trace/trace_syscalls.c
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@ -114,7 +114,7 @@ print_syscall_enter(struct trace_iterator *iter, int flags,
struct trace_entry *ent = iter->ent;
struct syscall_trace_enter *trace;
struct syscall_metadata *entry;
int i, ret, syscall;
int i, syscall;
trace = (typeof(trace))ent;
syscall = trace->nr;
@ -128,35 +128,28 @@ print_syscall_enter(struct trace_iterator *iter, int flags,
goto end;
}
ret = trace_seq_printf(s, "%s(", entry->name);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
trace_seq_printf(s, "%s(", entry->name);
for (i = 0; i < entry->nb_args; i++) {
if (trace_seq_has_overflowed(s))
goto end;
/* parameter types */
if (trace_flags & TRACE_ITER_VERBOSE) {
ret = trace_seq_printf(s, "%s ", entry->types[i]);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
if (trace_flags & TRACE_ITER_VERBOSE)
trace_seq_printf(s, "%s ", entry->types[i]);
/* parameter values */
ret = trace_seq_printf(s, "%s: %lx%s", entry->args[i],
trace->args[i],
i == entry->nb_args - 1 ? "" : ", ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
trace_seq_printf(s, "%s: %lx%s", entry->args[i],
trace->args[i],
i == entry->nb_args - 1 ? "" : ", ");
}
ret = trace_seq_putc(s, ')');
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
trace_seq_putc(s, ')');
end:
ret = trace_seq_putc(s, '\n');
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
trace_seq_putc(s, '\n');
return TRACE_TYPE_HANDLED;
return trace_handle_return(s);
}
static enum print_line_t
@ -168,7 +161,6 @@ print_syscall_exit(struct trace_iterator *iter, int flags,
struct syscall_trace_exit *trace;
int syscall;
struct syscall_metadata *entry;
int ret;
trace = (typeof(trace))ent;
syscall = trace->nr;
@ -176,7 +168,7 @@ print_syscall_exit(struct trace_iterator *iter, int flags,
if (!entry) {
trace_seq_putc(s, '\n');
return TRACE_TYPE_HANDLED;
goto out;
}
if (entry->exit_event->event.type != ent->type) {
@ -184,12 +176,11 @@ print_syscall_exit(struct trace_iterator *iter, int flags,
return TRACE_TYPE_UNHANDLED;
}
ret = trace_seq_printf(s, "%s -> 0x%lx\n", entry->name,
trace_seq_printf(s, "%s -> 0x%lx\n", entry->name,
trace->ret);
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
return TRACE_TYPE_HANDLED;
out:
return trace_handle_return(s);
}
extern char *__bad_type_size(void);