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Re: [Qemu-devel] [PATCH 4/3] checkpatch: Enforce proper do/while (0) sty

From: Eric Blake
Subject: Re: [Qemu-devel] [PATCH 4/3] checkpatch: Enforce proper do/while (0) style
Date: Thu, 30 Nov 2017 11:00:58 -0600
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0

On 11/30/2017 08:01 AM, Eric Blake wrote:
while (0) is only idiomatic in a macro definition, where the caller
will be supplying the trailing ';'.  Warn if the macro has a duplicate.

Signed-off-by: Eric Blake <address@hidden>
  scripts/checkpatch.pl | 5 +++++
  1 file changed, 5 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 34df753571..acb66bff34 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -1622,6 +1622,11 @@ sub process {

+# 'while (0);' is odd; only macros should use while (0), without trailing ;
+               if ($line =~ /while\s*\(0\);/) {

Should this also check for uses of 'while (false);' ?

Interestingly enough, we have an instance of 'do/while (false);' in tests/vhost-user-bridge.c that is NOT in a macro, but is used for the convenience of being able to 'break;' out early rather than using a goto. Similarly for chardev/char-serial.c using 'while (0);' outside of a macro. Those may be worth rewriting to use goto as separate patches if we want to restrict ALL use of 'while \((0|false)\);'

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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