checkpatch already makes an exception to the 80-column rule for quoted strings, and Documentation/CodingStyle recommends not splitting quoted strings across lines, because it breaks the ability to grep for the string. Rather than just permitting this, actively warn about quoted strings split across lines. Test case: void context(void) { struct { unsigned magic; const char *strdata; } foo[] = { { 42, "these strings" "do not produce warnings" }, { 256, "though perhaps" "they should" }, }; pr_err("this string" " should produce a warning\n"); pr_err("this multi-line string\n" "should not produce a warning\n"); asm ("this asm\n\t" "should not produce a warning"); } Results of checkpatch on that test case: WARNING: quoted string split across lines + " should produce a warning\n"); total: 0 errors, 1 warnings, 15 lines checked
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| @@ -1772,6 +1772,21 @@ sub process { · 1771 unmodified lines | ||
| 1772 | 1772 | "line over 80 characters\n" . $herecurr); |
| 1773 | 1773 | } |
| 1774 | 1774 | |
| 1775 | +# Check for user-visible strings broken across lines, which breaks the ability | |
| 1776 | +# to grep for the string. Limited to strings used as parameters (those | |
| 1777 | +# following an open parenthesis), which almost completely eliminates false | |
| 1778 | +# positives, as well as warning only once per parameter rather than once per | |
| 1779 | +# line of the string. Make an exception when the previous string ends in a | |
| 1780 | +# newline (multiple lines in one string constant) or \n\t (common in inline | |
| 1781 | +# assembly to indent the instruction on the following line). | |
| 1782 | + if ($line =~ /^\+\s*"/ && | |
| 1783 | + $prevline =~ /"\s*$/ && | |
| 1784 | + $prevline =~ /\(/ && | |
| 1785 | + $prevrawline !~ /\\n(?:\\t)*"\s*$/) { | |
| 1786 | + WARN("SPLIT_STRING", | |
| 1787 | + "quoted string split across lines\n" . $hereprev); | |
| 1788 | + } | |
| 1789 | + | |
| 1775 | 1790 | # check for spaces before a quoted newline |
| 1776 | 1791 | if ($rawline =~ /^.*\".*\s\\n/) { |
| 1777 | 1792 | WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE", |