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Date:   Mon, 12 Jun 2023 09:02:37 -0700
From:   Nathan Chancellor <nathan@kernel.org>
To:     Baoquan He <bhe@redhat.com>
Cc:     Mike Rapoport <rppt@kernel.org>, kernel test robot <lkp@intel.com>,
        linux-kernel@vger.kernel.org, llvm@lists.linux.dev,
        oe-kbuild-all@lists.linux.dev, linux-arch@vger.kernel.org,
        linux-mm@kvack.org, arnd@arndb.de, christophe.leroy@csgroup.eu,
        hch@lst.de, willy@infradead.org, agordeev@linux.ibm.com,
        wangkefeng.wang@huawei.com, schnelle@linux.ibm.com,
        David.Laight@aculab.com, shorne@gmail.com, deller@gmx.de,
        Brian Cain <bcain@quicinc.com>, linux-hexagon@vger.kernel.org
Subject: Re: [PATCH v6 02/19] hexagon: mm: Convert to GENERIC_IOREMAP
Message-ID: <20230612160237.GA199007@dev-arch.thelio-3990X>
References: <20230609075528.9390-3-bhe@redhat.com>
 <202306091859.NhlW2nny-lkp@intel.com>
 <ZIQzrRo0JhfBLDes@MiWiFi-R3L-srv>
 <20230611054019.GL52412@kernel.org>
 <ZIV+bD1ksJz0CTz2@MiWiFi-R3L-srv>
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In-Reply-To: <ZIV+bD1ksJz0CTz2@MiWiFi-R3L-srv>
Precedence: bulk

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@intel.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/

Cheers,
Nathan

> > > stdin>:1520:2: warning: syscall clone3 not implemented [-W#warnings]
> > >  1520 | #warning syscall clone3 not implemented
> > >       |  ^
> > > 1 warning generated.
> > > 
> > > ------
> > > diff --git a/scripts/checksyscalls.sh b/scripts/checksyscalls.sh
> > > index 1e5d2eeb726d..3a369b78edb7 100755
> > > --- a/scripts/checksyscalls.sh
> > > +++ b/scripts/checksyscalls.sh
> > > @@ -148,6 +148,7 @@ cat << EOF
> > >  #define __IGNORE_nanosleep
> > >  #define __IGNORE_io_getevents
> > >  #define __IGNORE_recvmmsg
> > > +#define __IGNORE_clone3
> > >  #endif
> > > 
> > > 
> > > From 6a86f4360a61a2b7b4d71172e5c03be554367553 Mon Sep 17 00:00:00 2001
> > > From: root <root@dell-pem620-01.dell2.lab.eng.bos.redhat.com>
> > > Date: Fri, 9 Jun 2023 21:21:36 -0400
> > > Subject: [PATCH] hexagon: mm: fix warning in asm/io.h
> > > Content-type: text/plain
> > > 
> > > Remove the old iounmap() declaration which is not consistent with the
> > > standard one in asm-generic/io.h, let's use the standard one.
> > > 
> > > And also add macro definition of inb/w/l and outb/w/l to override
> > > the definition of them in asm-generic/io.h.
> > > 
> > > Reported-by: kernel test robot <lkp@intel.com>
> > > Signed-off-by: Baoquan He <bhe@redhat.com>
> > > ---
> > >  arch/hexagon/include/asm/io.h | 8 ++++++--
> > >  scripts/checksyscalls.sh      | 1 +
> > >  2 files changed, 7 insertions(+), 2 deletions(-)
> > > 
> > > diff --git a/arch/hexagon/include/asm/io.h b/arch/hexagon/include/asm/io.h
> > > index dcd9cbbf5934..efe9cb00ebf8 100644
> > > --- a/arch/hexagon/include/asm/io.h
> > > +++ b/arch/hexagon/include/asm/io.h
> > > @@ -27,8 +27,6 @@
> > >  extern int remap_area_pages(unsigned long start, unsigned long phys_addr,
> > >  				unsigned long end, unsigned long flags);
> > >  
> > > -extern void iounmap(const volatile void __iomem *addr);
> > > -
> > >  /* Defined in lib/io.c, needed for smc91x driver. */
> > >  extern void __raw_readsw(const void __iomem *addr, void *data, int wordlen);
> > >  extern void __raw_writesw(void __iomem *addr, const void *data, int wordlen);
> > > @@ -207,16 +205,19 @@ static inline void memset_io(volatile void __iomem *addr, int value,
> > >   *
> > >   * Operates on "I/O bus I/O space"
> > >   */
> > > +#define inb inb
> > >  static inline u8 inb(unsigned long port)
> > >  {
> > >  	return readb(_IO_BASE + (port & IO_SPACE_LIMIT));
> > >  }
> > >  
> > > +#define inw inw
> > >  static inline u16 inw(unsigned long port)
> > >  {
> > >  	return readw(_IO_BASE + (port & IO_SPACE_LIMIT));
> > >  }
> > >  
> > > +#define inl inl
> > >  static inline u32 inl(unsigned long port)
> > >  {
> > >  	return readl(_IO_BASE + (port & IO_SPACE_LIMIT));
> > > @@ -227,16 +228,19 @@ static inline u32 inl(unsigned long port)
> > >   * @data: data to write to
> > >   * @addr:  address in I/O space
> > >   */
> > > +#define outb outb
> > >  static inline void outb(u8 data, unsigned long port)
> > >  {
> > >  	writeb(data, _IO_BASE + (port & IO_SPACE_LIMIT));
> > >  }
> > >  
> > > +#define outw outw
> > >  static inline void outw(u16 data, unsigned long port)
> > >  {
> > >  	writew(data, _IO_BASE + (port & IO_SPACE_LIMIT));
> > >  }
> > >  
> > > +#define outl outl
> > >  static inline void outl(u32 data, unsigned long port)
> > >  {
> > >  	writel(data, _IO_BASE + (port & IO_SPACE_LIMIT));
> > > 
> > 
> > -- 
> > Sincerely yours,
> > Mike.
> > 
> 
>