Messages in this thread Patch in this message | | | Date | Tue, 02 Nov 2021 16:11:37 -0400 | From | Steven Rostedt <> | Subject | [for-next][PATCH 11/14] tracing/histogram: Update division by 0 documentation |
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From: Kalesh Singh <kaleshsingh@google.com>
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> --- 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:: -- 2.33.0
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