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author | Xiao Guangrong <xiaoguangrong@cn.fujitsu.com> | 2009-07-01 08:50:25 (GMT) |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-07-02 06:51:13 (GMT) |
commit | e1af3aec3e2e7d21d4b3054323779d478c19d907 (patch) | |
tree | 338ef5a081fb66a6463ab4c1e882d7870ca154ac /kernel/trace | |
parent | 4a2bb6fcc80e6330ca2f2393e98605052cc7780b (diff) | |
download | linux-fsl-qoriq-e1af3aec3e2e7d21d4b3054323779d478c19d907.tar.xz |
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')
-rw-r--r-- | kernel/trace/trace_output.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index 7938f3a..e0c2545 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); } |