scripts: kernel-doc: Fix syntax error due to undeclared args variable

The backport of commit 3080ea5553cc ("stddef: Introduce
DECLARE_FLEX_ARRAY() helper") to 5.10.y (as a prerequisite of another
fix) modified scripts/kernel-doc and introduced a syntax error:

Global symbol "$args" requires explicit package name (did you forget to declare "my $args"?) at ./scripts/kernel-doc line 1236.
Global symbol "$args" requires explicit package name (did you forget to declare "my $args"?) at ./scripts/kernel-doc line 1236.
Execution of ./scripts/kernel-doc aborted due to compilation errors.

Note: The issue could be fixed in the 5.10.y series as well by
backporting e86bdb24375a ("scripts: kernel-doc: reduce repeated regex
expressions into variables") but just replacing the undeclared args back
to ([^,)]+) was the most straightforward approach. The issue is specific
to the backport to the 5.10.y series. Thus there is as well no upstream
commit for this change.

Fixes: 443b16ee3d9c ("stddef: Introduce DECLARE_FLEX_ARRAY() helper") # 5.10.y
Reported-by: Ben Hutchings <ben@decadent.org.uk>
Link: https://lore.kernel.org/regressions/ZeHKjjPGoyv_b2Tg@eldamar.lan/T/#u
Link: https://bugs.debian.org/1064035
Signed-off-by: Salvatore Bonaccorso <carnil@debian.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 7a04d4c0532607880f1e38dc5b907d90d780c4d2..8e3257f1ea2c1750941c1ef0b1329c9d697a5f6c 100755 (executable)
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1233,7 +1233,7 @@ sub dump_struct($$) {
        # replace DECLARE_KFIFO_PTR
        $members =~ s/DECLARE_KFIFO_PTR\s*\(([^,)]+),\s*([^,)]+)\)/$2 \*$1/gos;
        # replace DECLARE_FLEX_ARRAY
-       $members =~ s/(?:__)?DECLARE_FLEX_ARRAY\s*\($args,\s*$args\)/$1 $2\[\]/gos;
+       $members =~ s/(?:__)?DECLARE_FLEX_ARRAY\s*\(([^,)]+),\s*([^,)]+)\)/$1 $2\[\]/gos;
        my $declaration = $members;
 
        # Split nested struct/union elements as newer ones