[PATCH] checkpatch: fix a false check against wchar/utf-16 string

[AKASHI Takahiro <takahiro.akashi@linaro.org>]

On Thu, Jul 02, 2020 at 04:26:34PM -0400, Tom Rini wrote:
> On Thu, Jul 02, 2020 at 07:00:04PM +0200, Heinrich Schuchardt wrote:
> > On 16.06.20 16:17, Tom Rini wrote:
> > > On Tue, Jun 16, 2020 at 02:43:07PM +0900, AKASHI Takahiro wrote:
> > >
> > >> UEFI subsystem uses utf-16 string, but checkpatch.pl complains
> > >> about any occurrences of L"xxx" which is definitely legal.
> > >> So just suppress this kind of warning.
> > >> Precautiously, we will check u"xxx" as well.
> > >>
> > >> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org>
> > >> ---
> > >>  scripts/checkpatch.pl | 2 +-
> > >>  1 file changed, 1 insertion(+), 1 deletion(-)
> > >>
> > >> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> > >> index edba36565167..b3697720787c 100755
> > >> --- a/scripts/checkpatch.pl
> > >> +++ b/scripts/checkpatch.pl
> > >> @@ -5462,7 +5462,7 @@ sub process {
> > >>  		}
> > >>
> > >>  # concatenated string without spaces between elements
> > >> -		if ($line =~ /$String[A-Za-z0-9_]/ || $line =~ /[A-Za-z0-9_]$String/) {
> > >> +		if ($line =~ /$String[A-Za-z0-9_]/ || $line =~ /([A-Za-z0-9_]+[Lu]|[A-Za-z0-9_]*[A-KM-Za-tv-z0-9_])$String/) {
> > >>  			if (CHK("CONCATENATED_STRING",
> > >>  				"Concatenated strings should use spaces between elements\n" . $herecurr) &&
> > >>  			    $fix) {
> > >
> > > This looks like a generic checkpatch issue.  I think we're a little out
> > > of sync with the kernel's v5.7 but this doesn't look to be fixed there
> > > either.  Can you please submit it upstream?  Thanks!
> > >
> > 
> > Hello Tom,
> > 
> > I already raised that issue to the Kernel people and they were not
> > interested in fixing it:
> > 
> > https://lkml.org/lkml/2017/10/17/1086
> > 
> > Recently a lot of changes have been done to the U-Boot version of
> > checkpatch.pl.
> > 
> > Do we want to diverge from the upstream and have a lot of work each time
> > we try to sync? Or should we use checkpatch.pl as is and live without
> > U-Boot specific stuff?
> 
> I would raise the issue with Joe again to see if he still doesn't want
> to support wide strings.  If he doesn't I worry that since this change
> is outside of the new u-boot function it will get removed by accident
> with a future resync.

To be strict, Joe's comment, "Kernel doesn't support wide strings."
is no longer true. We can see several examples of L"..." in
    security/integrity/platform_certs/load_uefi.c

-Takahiro Akashi

> -- 
> Tom