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tracing/histogram: Update division by 0 documentation
If the divisor is a constant and zero, the undeifned case can be detected and an error returned instead of -1. Link: https://lkml.kernel.org/r/20211029183339.3216491-3-kaleshsingh@google.com Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ingo Molnar <mingo@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Tom Zanussi <zanussi@kernel.org> Signed-off-by: Kalesh Singh <kaleshsingh@google.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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@ -1766,7 +1766,8 @@ using the same key and variable from yet another event::
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Expressions support the use of addition, subtraction, multiplication and
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Expressions support the use of addition, subtraction, multiplication and
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division operators (+-\*/).
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division operators (+-\*/).
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Note that division by zero always returns -1.
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Note if division by zero cannot be detected at parse time (i.e. the
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divisor is not a constant), the result will be -1.
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Numeric constants can also be used directly in an expression::
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Numeric constants can also be used directly in an expression::
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