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authorXiao Guangrong <xiaoguangrong@cn.fujitsu.com>2009-07-01 10:50:25 +0200
committerIngo Molnar <mingo@elte.hu>2009-07-02 08:51:13 +0200
commite1af3aec3e2e7d21d4b3054323779d478c19d907 (patch)
tree338ef5a081fb66a6463ab4c1e882d7870ca154ac /kernel/trace/trace_output.c
parentkprobes: No need to unlock kprobe_insn_mutex (diff)
downloadlinux-e1af3aec3e2e7d21d4b3054323779d478c19d907.tar.xz
linux-e1af3aec3e2e7d21d4b3054323779d478c19d907.zip
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 <xiaoguangrong@cn.fujitsu.com> Acked-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Acked-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro> Cc: Steven Rostedt <rostedt@goodmis.org> LKML-Reference: <4A4B2351.5010300@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_output.c')
-rw-r--r--kernel/trace/trace_output.c3
1 files changed, 1 insertions, 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);
}