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checkpatch: warn on const char foo[] = "bar"; declarations

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These declarations should generally be static const to avoid poor
compilation and runtime performance where compilers tend to initialize
the const declaration for every call instead of using .rodata for the
string.

Miscellanea:

 - Convert spaces to tabs for indentation in 2 adjacent checks

Link: http://lkml.kernel.org/r/10ea5f4b087dc911e41e187a4a2b5e79c7529aa3.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joe Perches 2019-01-03 15:26:59 -08:00 • committed by Linus Torvalds
parent 05391772a7
commit 77b8c0a8e4
1 changed files with 11 additions and 2 deletions
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13
scripts/checkpatch.pl
View file

@ -3890,14 +3890,23 @@ sub process {
WARN("STATIC_CONST_CHAR_ARRAY",
"static const char * array should probably be static const char * const\n" .
$herecurr);
}
}
# check for initialized const char arrays that should be static const
if ($line =~ /^\+\s*const\s+(char|unsigned\s+char|_*u8|(?:[us]_)?int8_t)\s+\w+\s*\[\s*(?:\w+\s*)?\]\s*=\s*"/) {
if (WARN("STATIC_CONST_CHAR_ARRAY",
"const array should probably be static const\n" . $herecurr) &&
$fix) {
$fixed[$fixlinenr] =~ s/(^.\s*)const\b/${1}static const/;
}
}
# check for static char foo[] = "bar" declarations.
if ($line =~ /\bstatic\s+char\s+(\w+)\s*\[\s*\]\s*=\s*"/) {
WARN("STATIC_CONST_CHAR_ARRAY",
"static char array declaration should probably be static const char\n" .
$herecurr);
}
}
# check for const <foo> const where <foo> is not a pointer or array type
if ($sline =~ /\bconst\s+($BasicType)\s+const\b/) {