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authorLi Zefan <lizf@cn.fujitsu.com>2009-08-20 16:13:35 +0800
committerIngo Molnar <mingo@elte.hu>2009-08-20 12:12:22 +0200
commit4539f07701b3f743580d19dc5d655fb8d21b0a3c (patch)
tree15bb4504cda47f4e5281831eccd91b51dcd4b095
parent540b7b8d65575c80162f2a0f38e1d313c92a6042 (diff)
downloadlinux-4539f07701b3f743580d19dc5d655fb8d21b0a3c.tar.bz2
tracing/syscalls: Fix the output of syscalls with no arguments
Before: # echo 1 > events/syscalls/sys_enter_sync/enable # cat events/syscalls/sys_enter_sync/format ... field:int nr; offset:12; size:4; print fmt: "# sync # cat trace ... sync-8950 [000] 2366.087670: sys_sync( After: # echo 1 > events/syscalls/sys_enter_sync/enable # cat events/syscalls/sys_enter_sync/format ... field:int nr; offset:12; size:4; print fmt: "" # sync # cat trace sync-2134 [001] 136.780735: sys_sync() Reported-by: Masami Hiramatsu <mhiramat@redhat.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Jason Baron <jbaron@redhat.com> Cc: Masami Hiramatsu <mhiramat@redhat.com> LKML-Reference: <4A8D05AF.20103@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--kernel/trace/trace_syscalls.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 28e4dae4af21..46c1b977a2cb 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -46,15 +46,22 @@ print_syscall_enter(struct trace_iterator *iter, int flags)
return TRACE_TYPE_PARTIAL_LINE;
}
/* parameter values */
- ret = trace_seq_printf(s, "%s: %lx%s ", entry->args[i],
+ ret = trace_seq_printf(s, "%s: %lx%s", entry->args[i],
trace->args[i],
- i == entry->nb_args - 1 ? ")" : ",");
+ i == entry->nb_args - 1 ? "" : ", ");
if (!ret)
return TRACE_TYPE_PARTIAL_LINE;
}
+ ret = trace_seq_putc(s, ')');
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
end:
- trace_seq_printf(s, "\n");
+ ret = trace_seq_putc(s, '\n');
+ if (!ret)
+ return TRACE_TYPE_PARTIAL_LINE;
+
return TRACE_TYPE_HANDLED;
}
@@ -129,24 +136,24 @@ int syscall_enter_format(struct ftrace_event_call *call, struct trace_seq *s)
offset += sizeof(unsigned long);
}
- trace_seq_printf(s, "\nprint fmt: \"");
+ trace_seq_puts(s, "\nprint fmt: \"");
for (i = 0; i < entry->nb_args; i++) {
ret = trace_seq_printf(s, "%s: 0x%%0%zulx%s", entry->args[i],
sizeof(unsigned long),
- i == entry->nb_args - 1 ? "\", " : ", ");
+ i == entry->nb_args - 1 ? "" : ", ");
if (!ret)
return 0;
}
+ trace_seq_putc(s, '"');
for (i = 0; i < entry->nb_args; i++) {
- ret = trace_seq_printf(s, "((unsigned long)(REC->%s))%s",
- entry->args[i],
- i == entry->nb_args - 1 ? "\n" : ", ");
+ ret = trace_seq_printf(s, ", ((unsigned long)(REC->%s))",
+ entry->args[i]);
if (!ret)
return 0;
}
- return ret;
+ return trace_seq_putc(s, '\n');
}
int syscall_exit_format(struct ftrace_event_call *call, struct trace_seq *s)