From e1af3aec3e2e7d21d4b3054323779d478c19d907 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Wed, 1 Jul 2009 16:50:25 +0800 Subject: tracing: Fix trace_print_seq() We will lose something if trace_seq->buffer[0] is 0, because the copy length is calculated by strlen() in seq_puts(), so using seq_write() instead of seq_puts(). There have a example: after reboot: # echo kmemtrace > current_tracer # echo 0 > options/kmem_minimalistic # cat trace # tracer: kmemtrace # # Nothing is exported, because the first byte of trace_seq->buffer[ ] is KMEMTRACE_USER_ALLOC. ( the value of KMEMTRACE_USER_ALLOC is zero, seeing kmemtrace_print_alloc_user() in kernel/trace/kmemtrace.c) Signed-off-by: Xiao Guangrong Acked-by: Frederic Weisbecker Acked-by: Pekka Enberg Acked-by: Eduard - Gabriel Munteanu Cc: Steven Rostedt LKML-Reference: <4A4B2351.5010300@cn.fujitsu.com> Signed-off-by: Ingo Molnar --- kernel/trace/trace_output.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index 7938f3ae93e3..e0c2545622e8 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -27,8 +27,7 @@ void trace_print_seq(struct seq_file *m, struct trace_seq *s) { int len = s->len >= PAGE_SIZE ? PAGE_SIZE - 1 : s->len; - s->buffer[len] = 0; - seq_puts(m, s->buffer); + seq_write(m, s->buffer, len); trace_seq_init(s); } -- cgit v1.2.1