| Date | Fri, 14 Nov 2014 23:58:48 -0500 | From | Steven Rostedt <> | Subject | [PATCH 01/26 v5] tracing: Fix trace_seq_bitmask() to start at current position |
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From: "Steven Rostedt (Red Hat)" <rostedt@goodmis.org>
In trace_seq_bitmask() it calls bitmap_scnprintf() not from the current position of the trace_seq buffer (s->buffer + s->len), but instead from the beginning of the buffer (s->buffer).
Luckily, the only user of this "ipi_raise tracepoint" uses it as the first parameter, and as such, the start of the temp buffer in include/trace/ftrace.h (see __get_bitmask()).
Reported-by: Petr Mladek <pmladek@suse.cz> Reviewed-by: Petr Mladek <pmladek@suse.cz> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> --- kernel/trace/trace_seq.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/trace/trace_seq.c b/kernel/trace/trace_seq.c index 1f24ed99dca2..b100994a17fe 100644 --- a/kernel/trace/trace_seq.c +++ b/kernel/trace/trace_seq.c @@ -122,7 +122,7 @@ int trace_seq_bitmask(struct trace_seq *s, const unsigned long *maskp, if (s->full || !len) return 0; - ret = bitmap_scnprintf(s->buffer, len, maskp, nmaskbits); + ret = bitmap_scnprintf(s->buffer + s->len, len, maskp, nmaskbits); s->len += ret; return 1; -- 2.1.1
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