Re: [Qemu-devel] [PATCH] checkpatch: allow tabs in linux-headers

["Radim Krčmář" <rkrcmar@redhat.com>]

2016-08-10 09:09+0200, Cornelia Huck:
> On Tue, 9 Aug 2016 12:14:14 -0400 (EDT)
> Paolo Bonzini <pbonzini@redhat.com> wrote:
>> > Make scripts/checkpatch.pl accept tabs in linux-headers/, instead of
>> > changing scripts/update-linux-headers.sh to expand tabs when importing.
>> > 
>> > Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
>> > ---
>> > diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
>> > index 929708721299..38232d4b25c3 100755
>> > --- a/scripts/checkpatch.pl
>> > +++ b/scripts/checkpatch.pl
>> > @@ -1355,7 +1355,7 @@ sub process {
>> >  		next if ($realfile !~ /\.(h|c|cpp|pl)$/);
>> >  
>> >  # in QEMU, no tabs are allowed
>> > -		if ($rawline =~ /^\+.*\t/) {
>> > +		if ($rawline =~ /^\+.*\t/ && $realfile !~ /^linux-headers\//) {
>> >  			my $herevet = "$here\n" . cat_vet($rawline) . "\n";
>> >  			ERROR("code indent should never use tabs\n" . $herevet);
>> >  			$rpt_cleaners = 1;
>> > 
>> 
>> Could you do the same for standard-headers/ too?
> 
> I think it would be better to not apply any qemu coding style checks to
> a headers update. Something like 'check if this contains header updates
> _only_' would make more sense, but that is beyond my nonexisting perl
> skills...

I have posted another vesion that does not check for any code style in
hunks that modify linux-headers and include/standard-headers,
http://lists.nongnu.org/archive/html/qemu-devel/2016-08/msg01824.html

We still want to check header-only updates in other headers ...
Your condition would draw attention to linux header updates that also
touch other files, but I think that a diffstat is enough.

The script would need some preprocessing to know that only headers are
modified or buffering of errors until the script knows that only headers
were modified; neither is hard, but the added complexity is not
compensated by usefulness, IMO.