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| author | Kalesh Singh <kaleshsingh@google.com> | 2021-10-29 20:33:28 +0200 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2021-11-02 01:46:29 +0100 |
| commit | 0ca6d12c9768ee15e6c7d65ddb5cb35c05946e1e (patch) | |
| tree | fabdf5a8687aa930965db05fd35e4ce4c259fb14 /Documentation/trace | |
| parent | tracing/histogram: Optimize division by constants (diff) | |
| download | linux-0ca6d12c9768ee15e6c7d65ddb5cb35c05946e1e.tar.xz linux-0ca6d12c9768ee15e6c7d65ddb5cb35c05946e1e.zip | |
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>
Diffstat (limited to 'Documentation/trace')
| -rw-r--r-- | Documentation/trace/histogram.rst | 3 |
1 files changed, 2 insertions, 1 deletions
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:: |