checkpatch: add error on use of attribute((weak)) or __weak declarations
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>
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 696254e..8a577aa 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4671,6 +4671,15 @@
}
}
+# 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",