linux-kernel - Re: [PATCH v6 02/19] hexagon: mm: Convert to GENERIC

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Date:   Fri, 16 Jun 2023 20:46:33 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     Mike Rapoport <rppt@...nel.org>, kernel test robot <lkp@...el.com>,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev,
        oe-kbuild-all@...ts.linux.dev, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, arnd@...db.de, christophe.leroy@...roup.eu,
        hch@....de, willy@...radead.org, agordeev@...ux.ibm.com,
        wangkefeng.wang@...wei.com, schnelle@...ux.ibm.com,
        David.Laight@...lab.com, shorne@...il.com, deller@....de,
        Brian Cain <bcain@...cinc.com>, linux-hexagon@...r.kernel.org
Subject: Re: [PATCH v6 02/19] hexagon: mm: Convert to GENERIC_IOREMAP

On 06/12/23 at 09:02am, Nathan Chancellor wrote:
> On Sun, Jun 11, 2023 at 03:57:32PM +0800, Baoquan He wrote:
> > On 06/11/23 at 08:40am, Mike Rapoport wrote:
> > > Hi Baoquan,
> > > 
> > > On Sat, Jun 10, 2023 at 04:26:21PM +0800, Baoquan He wrote:
> > > > On 06/09/23 at 07:09pm, kernel test robot wrote:
> > > > > Hi Baoquan,
> > > > > 
> > > > > kernel test robot noticed the following build errors:
> > > > > 
> > > > > [auto build test ERROR on akpm-mm/mm-everything]
> > > > > 
> > > > > url:    https://github.com/intel-lab-lkp/linux/commits/Baoquan-He/asm-generic-iomap-h-remove-ARCH_HAS_IOREMAP_xx-macros/20230609-160014
> > > > > base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> > > > > patch link:    https://lore.kernel.org/r/20230609075528.9390-3-bhe%40redhat.com
> > > > > patch subject: [PATCH v6 02/19] hexagon: mm: Convert to GENERIC_IOREMAP
> > > > > config: hexagon-randconfig-r041-20230608 (https://download.01.org/0day-ci/archive/20230609/202306091859.NhlW2nny-lkp@intel.com/config)
> > > > > compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
> > > > > reproduce (this is a W=1 build):
> > > > >         mkdir -p ~/bin
> > > > >         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> > > > >         chmod +x ~/bin/make.cross
> > > > >         git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
> > > > >         git fetch akpm-mm mm-everything
> > > > >         git checkout akpm-mm/mm-everything
> > > > >         b4 shazam https://lore.kernel.org/r/20230609075528.9390-3-bhe@redhat.com
> > > > >         # save the config file
> > > > >         mkdir build_dir && cp config build_dir/.config
> > > > >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=hexagon olddefconfig
> > > > >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=hexagon prepare
> > > > > 
> > > > > If you fix the issue in a separate patch/commit (i.e. not just a new version of
> > > > > the same patch/commit), kindly add following tags
> > > > > | Reported-by: kernel test robot <lkp@...el.com>
> > > > > | Closes: https://lore.kernel.org/oe-kbuild-all/202306091859.NhlW2nny-lkp@intel.com/
> > > > 
> > > > Thanks for reporting. I reproduced them on my local machine. Below patch
> > > > can fix them. And by the way, I also saw the clone3 warning, and have to 
> > > > made change in scripts/checksyscalls.sh to mute it, wondering how you
> > > > handle it in your testing.
> > > 
> > > I think the warning kbuild reported is rather this one:
> > > 
> > > >> include/asm-generic/io.h:1078:6: error: conflicting types for 'iounmap'
> > >     1078 | void iounmap(volatile void __iomem *addr);
> > >          |      ^
> > 
> > This one is reported as error. The old iounmap() declaration has a const,
> > while the standard one doesn't have. So I just remove the old one to use
> > the standard one.
> > 
> > Another one is warning about PCI_IOBASE. Because inb/w/l and outb/w/l is
> > redefined in asm-generic/io.h, and it uses PCI_IOBASE which is defniend
> > as NULL in asm-generic/io.h if ARCH doesn't have its own PCI_IOBASE
> > definition. Then the warning is triggered. So I define macro to override
> > the standard inb/w/l and outb/w/l.
> > 
> > #ifndef PCI_IOBASE
> > #define PCI_IOBASE ((void __iomem *)0)
> > #endif
> 
> I believe that this series [1] by Niklas Schnelle should take care of
> the PCI_IOBASE warnings (which are not Hexagon specific), so there is no
> need to worry about them when they show up in build reports.
> 
> [1]: https://lore.kernel.org/20230522105049.1467313-1-schnelle@linux.ibm.com/

That's great, then I can skip the fixing of PCI_IOBASE warnings, only
wrap the fixing of iounmap() declaration issue into the new post. Thanks
a lot for the information, Nathan.

Thanks
Baoquan