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checkpatch: add error on use of attribute((weak)) or __weak declarations

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Using weak declarations can have unintended link defects.  The __weak on
the declaration causes non-weak definitions to become weak.

Emit an error on its use.

Signed-off-by: Joe Perches <joe@perches.com>
Reported-by: Bjorn Helgaas <bhelgaas@google.com>
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 2014-12-10 15:51:35 -08:00 committed by Linus Torvalds
parent 2381097b6c
commit 619a908aa3
1 changed files with 9 additions and 0 deletions
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9
scripts/checkpatch.pl
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@ -4671,6 +4671,15 @@ sub process {
}
}
# Check for __attribute__ weak, or __weak declarations (may have link issues)
if ($^V && $^V ge 5.10.0 &&
$line =~ /(?:$Declare|$DeclareMisordered)\s*$Ident\s*$balanced_parens\s*(?:$Attribute)?\s*;/ &&
($line =~ /\b__attribute__\s*\(\s*\(.*\bweak\b/ ||
$line =~ /\b__weak\b/)) {
ERROR("WEAK_DECLARATION",
"Using weak declarations can have unintended link defects\n" . $herecurr);
}
# check for sizeof(&)
if ($line =~ /\bsizeof\s*\(\s*\&/) {
WARN("SIZEOF_ADDRESS",