linux-kernel - [PATCH 5.10 294/717] scripts: kernel-doc: fix parsing function-like typedefs

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Date:   Mon, 28 Dec 2020 13:44:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 294/717] scripts: kernel-doc: fix parsing function-like typedefs

From: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>

[ Upstream commit 7d2c6b1edf790d96e9017a0b27be2425e1af1532 ]

Changeset 6b80975c6308 ("scripts: kernel-doc: fix typedef parsing")
added support for things like:

	typedef unsigned long foo();

However, it caused a regression on this prototype:

	typedef bool v4l2_check_dv_timings_fnc(const struct v4l2_dv_timings *t, void *handle);

This is only noticed after adding a patch that checks if the
kernel-doc identifier matches the typedef:

	./scripts/kernel-doc -none $(git grep '^.. kernel-doc::' Documentation/ |cut -d ' ' -f 3|sort|uniq) 2>&1|grep expecting
	include/media/v4l2-dv-timings.h:38: warning: expecting prototype for typedef v4l2_check_dv_timings_fnc. Prototype was for typedef nc instead

The problem is that, with the new parsing logic, it is not
checking for complete words at the type part.

Fix it by adding a \b at the end of each type word at the
regex.

fixes: 6b80975c6308 ("scripts: kernel-doc: fix typedef parsing")
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Link: https://lore.kernel.org/r/218ff56dcb8e73755005d3fb64586eb1841a276b.1606896997.git.mchehab+huawei@kernel.org
Signed-off-by: Jonathan Corbet <corbet@....net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 scripts/kernel-doc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/kernel-doc b/scripts/kernel-doc
index 9b6ddeb097e93..6325bec3f66f8 100755
--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -1431,7 +1431,7 @@ sub dump_enum($$) {
     }
 }
 
-my $typedef_type = qr { ((?:\s+[\w\*]+){1,8})\s* }x;
+my $typedef_type = qr { ((?:\s+[\w\*]+\b){1,8})\s* }x;
 my $typedef_ident = qr { \*?\s*(\w\S+)\s* }x;
 my $typedef_args = qr { \s*\((.*)\); }x;
 
-- 
2.27.0