linux-kernel - Re: [PATCH v2 1/2] serial: 8250_pci: Replace custom pci_match

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Message-ID: <YXgEIhCGXjDUNDU0@smile.fi.intel.com>
Date:   Tue, 26 Oct 2021 16:35:30 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     kernel test robot <lkp@...el.com>
Cc:     linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jirislaby@...nel.org>
Subject: Re: [PATCH v2 1/2] serial: 8250_pci: Replace custom pci_match_id()
 implementation

On Tue, Oct 26, 2021 at 04:25:58PM +0300, Andy Shevchenko wrote:
> On Tue, Oct 26, 2021 at 08:45:48PM +0800, kernel test robot wrote:

> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 ARCH=i386

> > >> drivers/tty/serial/8250/8250_pci.c:1268:6: warning: variable 'amcc' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
> >            if (match)
> >                ^~~~~
> >    drivers/tty/serial/8250/8250_pci.c:1273:6: note: uninitialized use occurs here
> >            if (amcc) {
> >                ^~~~
> >    drivers/tty/serial/8250/8250_pci.c:1268:2: note: remove the 'if' if its condition is always true
> >            if (match)
> >            ^~~~~~~~~~
> >    drivers/tty/serial/8250/8250_pci.c:1265:11: note: initialize the variable 'amcc' to silence this warning
> >            bool amcc;
> >                     ^
> >                      = 0
> 
> Clang gives a right and wrong advice at the same time.
> Thank you for the uninitialized case, but variable is boolean, what's 0 here?
> 
> I'll send a fix ASAP.

Hmm... GCC haven't showed anything here.
In any case, v3 has just been sent out.

-- 
With Best Regards,
Andy Shevchenko