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| author | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-07-07 18:08:21 +0300 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-07-07 20:14:21 +0300 |
| commit | 26c563731056c3ee66f91106c3078a8c36bb7a9e (patch) | |
| tree | 770d40aacb5530ab3cf707e06974bb70abe4005c | |
| parent | 4030a6e6a6a4a42ff8c18414c9e0c93e24cc70b8 (diff) | |
| download | linux-26c563731056c3ee66f91106c3078a8c36bb7a9e.tar.xz | |
tracing/histograms: Fix parsing of "sym-offset" modifier
With the addition of simple mathematical operations (plus and minus), the
parsing of the "sym-offset" modifier broke, as it took the '-' part of the
"sym-offset" as a minus, and tried to break it up into a mathematical
operation of "field.sym - offset", in which case it failed to parse
(unless the event had a field called "offset").
Both .sym and .sym-offset modifiers should not be entered into
mathematical calculations anyway. If ".sym-offset" is found in the
modifier, then simply make it not an operation that can be calculated on.
Link: https://lkml.kernel.org/r/20210707110821.188ae255@oasis.local.home
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 100719dcef447 ("tracing: Add simple expression support to hist triggers")
Reviewed-by: Tom Zanussi <zanussi@kernel.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
| -rw-r--r-- | kernel/trace/trace_events_hist.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c index ba03b7d84fc2..0207aeed31e6 100644 --- a/kernel/trace/trace_events_hist.c +++ b/kernel/trace/trace_events_hist.c @@ -1555,6 +1555,13 @@ static int contains_operator(char *str) switch (*op) { case '-': + /* + * Unfortunately, the modifier ".sym-offset" + * can confuse things. + */ + if (op - str >= 4 && !strncmp(op - 4, ".sym-offset", 11)) + return FIELD_OP_NONE; + if (*str == '-') field_op = FIELD_OP_UNARY_MINUS; else |