If the divisor is a constant and zero, the undeifned case can be detected and an error returned instead of -1.
Signed-off-by: Kalesh Singh kaleshsingh@google.com --- Documentation/trace/histogram.rst | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Documentation/trace/histogram.rst b/Documentation/trace/histogram.rst index 66ec972dfb78..859fd1b76c63 100644 --- a/Documentation/trace/histogram.rst +++ b/Documentation/trace/histogram.rst @@ -1766,7 +1766,8 @@ using the same key and variable from yet another event:: Expressions support the use of addition, subtraction, multiplication and division operators (+-*/).
-Note that division by zero always returns -1. +Note if division by zero cannot be detected at parse time (i.e. the +divisor is not a constant), the result will be -1.
Numeric constants can also be used directly in an expression::