linux-kernel - Re: [PATCH v3 3/6] staging: r8188eu: add error handling of rtw

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Date:   Wed, 25 Aug 2021 16:44:30 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     Dan Carpenter <dan.carpenter@...cle.com>
Cc:     kernel test robot <lkp@...el.com>, Larry.Finger@...inger.net,
        phil@...lpotter.co.uk, gregkh@...uxfoundation.org,
        straube.linux@...il.com, fmdefrancesco@...il.com,
        clang-built-linux@...glegroups.com, kbuild-all@...ts.01.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/6] staging: r8188eu: add error handling of rtw_read8

On 8/25/21 4:34 PM, Dan Carpenter wrote:
> On Wed, Aug 25, 2021 at 04:02:26PM +0300, Pavel Skripkin wrote:
>> > This is not related to your patch.  Ignore it.
>> > 
>> > 
>> > > > vim +2022 drivers/staging/r8188eu/hal/usb_halinit.c
>> > > >
>> > > 
>> > > >    2020		case HW_VAR_BCN_VALID:
>> > > >    2021			/* BCN_VALID, BIT(16) of REG_TDECTRL = BIT(0) of REG_TDECTRL+2, write 1 to clear, Clear by sw */
>> > > > > 2022				u8 tmp;
>> > > 
>> > > Hm, I don't know anything about ARM compilers, so should I wrap this code
>> > > block with {}?
>> > 
>> > Yep.
>> > 
>> > > 
>> > > My local gcc 11.1.1 (x86_64) does not produce any warnings/errors
>> > > 
>> > 
>> > You should figure out whats up with that because it shouldn't compile
>> > with the gcc options that the kernel uses.
>> > 
>> 
>> AFAIK, at least 2 guys except me in this CC list compiled my series without
>> errors/warnings. Maybe, staging tree is missing some Makefile updates?
>> 
>> 
>> I'll resend series this evening anyway, but this is strange....
> 
> Hm...  In my version of GCC the error is:
> 
> drivers/staging/r8188eu/hal/usb_halinit.c:1870:3: error: a label can only be part of a statement and a declaration is not a statement
> 
> That's a different error from what I was expecting.  It's caused by
> having a declaration directly after a case statement.  The warning that
> I was expecting was from -Wdeclaration-after-statement and it looks
> like this:
> 
> warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement]
> 
> You really should try investigate why this compiles for you because
> something is going wrong.  It should not build without a warning.
> 

Looks like it's bug in gcc 11.1.1. I've rebuilt this module with gcc 10 
(gcc-10 (SUSE Linux) 10.3.1 20210707 [revision 
048117e16c77f82598fca9af585500572d46ad73]) and build fails with error 
described above


My default gcc is

gcc (SUSE Linux) 11.1.1 20210721 [revision 
076930b9690ac3564638636f6b13bbb6bc608aea]


Any idea? :)


With regards,
Pavel Skripkin