linux-kernel - [PATCH 4.14 101/159] scripts/kernel-doc: Dont fail with status != 0 if error encountered with -none

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Date:   Fri, 23 Feb 2018 19:26:49 +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, Matthew Wilcox <mawilcox@...rosoft.com>,
        Jonathan Corbet <corbet@....net>,
        Will Deacon <will.deacon@....com>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 101/159] scripts/kernel-doc: Dont fail with status != 0 if error encountered with -none

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Will Deacon <will.deacon@....com>

[ Upstream commit e814bccbafece52a24e152d2395b5d49eef55841 ]

My bisect scripts starting running into build failures when trying to
compile 4.15-rc1 with the builds failing with things like:

drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c:2078: error: Cannot parse struct or union!

The line in question is actually just a #define, but after some digging
it turns out that my scripts pass W=1 and since commit 3a025e1d1c2ea
("Add optional check for bad kernel-doc comments") that results in
kernel-doc running on each source file. The file in question has a
badly formatted comment immediately before the #define:

/**
 * struct brcmf_skbuff_cb reserves first two bytes in sk_buff::cb for
 * bus layer usage.
 */

which causes the regex in dump_struct to fail (lack of braces following
struct declaration) and kernel-doc returns 1, which causes the build
to fail.

Fix the issue by always returning 0 from kernel-doc when invoked with
-none. It successfully generates no documentation, and prints out any
issues.

Cc: Matthew Wilcox <mawilcox@...rosoft.com>
Cc: Jonathan Corbet <corbet@....net>
Signed-off-by: Will Deacon <will.deacon@....com>
Signed-off-by: Jonathan Corbet <corbet@....net>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 scripts/kernel-doc |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/scripts/kernel-doc
+++ b/scripts/kernel-doc
@@ -3216,4 +3216,4 @@ if ($verbose && $warnings) {
   print STDERR "$warnings warnings\n";
 }

-exit($errors);
+exit($output_mode eq "none" ? 0 : $errors);