Line lengths above 80 characters do exist. They are rare, but they happen from time to time. An ignored rule is worse than an exception to the rule, so do the latter.
Some on the list expressed their preference for a soft limit that is slightly lower than 80 characters, to account for extra characters in unified diffs (including three-way diffs) and for email quoting. However, there was no consensus on this so keep the 80-character soft limit and add a hard limit at 90. Signed-off-by: Paolo Bonzini <[email protected]> --- CODING_STYLE | 13 ++++++++++--- scripts/checkpatch.pl | 8 ++++++-- 2 files changed, 16 insertions(+), 5 deletions(-) diff --git a/CODING_STYLE b/CODING_STYLE index 3c6978f..4e48a96 100644 --- a/CODING_STYLE +++ b/CODING_STYLE @@ -31,14 +31,20 @@ Do not leave whitespace dangling off the ends of lines. 2. Line width -Lines are 80 characters; not longer. +Lines should be 80 characters; try not to make them longer. + +Sometimes it is hard to do, especially when dealing with QEMU subsystems +that use long function or symbol names. Even in that case, do not make +lines much longer than 80 characters. Rationale: - Some people like to tile their 24" screens with a 6x4 matrix of 80x24 xterms and use vi in all of them. The best way to punish them is to let them keep doing it. - Code and especially patches is much more readable if limited to a sane line length. Eighty is traditional. + - The four-space indentation makes the most common excuse ("But look + at all that white space on the left!") moot. - It is the QEMU coding style. 3. Naming diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index f6928db..714a000 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -1336,12 +1336,16 @@ sub process { # check we are in a valid source file if not then ignore this hunk next if ($realfile !~ /\.(h|c|cpp|s|S|pl|py|sh)$/); -#80 column limit +#90 column limit if ($line =~ /^\+/ && !($line =~ /^\+\s*"[^"]*"\s*(?:\s*|,|\)\s*;)\s*$/) && $length > 80) { - WARN("line over 80 characters\n" . $herecurr); + if ($length > 90) { + ERROR("line over 90 characters\n" . $herecurr); + } else { + WARN("line over 80 characters\n" . $herecurr); + } } # check for spaces before a quoted newline -- 1.8.3.1
