linux-kernel - Re: [PATCH v7 02/19] hexagon: mm: Convert to GENERIC

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Date:   Sun, 25 Jun 2023 09:15:05 +0800
From:   Baoquan He <bhe@...hat.com>
To:     Nathan Chancellor <nathan@...nel.org>
Cc:     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,
        hch@....de, christophe.leroy@...roup.eu, rppt@...nel.org,
        willy@...radead.org, agordeev@...ux.ibm.com,
        wangkefeng.wang@...wei.com, schnelle@...ux.ibm.com,
        David.Laight@...lab.com, shorne@...il.com, deller@....de,
        glaubitz@...sik.fu-berlin.de, Brian Cain <bcain@...cinc.com>,
        linux-hexagon@...r.kernel.org
Subject: Re: [PATCH v7 02/19] hexagon: mm: Convert to GENERIC_IOREMAP

On 06/21/23 at 07:08pm, Nathan Chancellor wrote:
> On Wed, Jun 21, 2023 at 04:50:53PM +0800, Baoquan He wrote:
> > Hi,
> > 
> > On 06/21/23 at 10:15am, 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/20230620-212135
> > > base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> > > patch link:    https://lore.kernel.org/r/20230620131356.25440-3-bhe%40redhat.com
> > > patch subject: [PATCH v7 02/19] hexagon: mm: Convert to GENERIC_IOREMAP
> > > config: hexagon-randconfig-r041-20230620 (https://download.01.org/0day-ci/archive/20230621/202306211030.DioMEPhl-lkp@intel.com/config)
> > > compiler: clang version 17.0.0 (https://github.com/llvm/llvm-project.git 4a5ac14ee968ff0ad5d2cc1ffa0299048db4c88a)
> > > reproduce: (https://download.01.org/0day-ci/archive/20230621/202306211030.DioMEPhl-lkp@intel.com/reproduce)
> > > 
> > > 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/202306211030.DioMEPhl-lkp@intel.com/
> > > 
> > > All errors (new ones prefixed by >>):
> > > 
> > > >> arch/hexagon/kernel/hexagon_ksyms.o: error: local symbol ioremap was exported
> > 
> > I followed steps in your reproduce link, didn't reproduce the error as
> > above line reported. I can still see those PCI_IOMAP warning, however
> > they will disappear when rebuilding. The clone3 warning can always ben
> > seen. I didn't see the symbol ioremap error. Could you double check if
> > anything missed in steps?
> > 
> > [root@...l-pem620-01 linux]# COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang ~/bin/make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash
> > Compiler will be installed in /root/0day
> > make --keep-going LLVM=1 CROSS_COMPILE=hexagon-linux- LLVM_IAS=1 --jobs=48 W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash
> > make[1]: Entering directory '/root/linux/build_dir'
> >   GEN     Makefile
> > ld.lld: /lib64/libtinfo.so.6: no version information available (required by ld.lld)
> 
> Hmmm, seems like a dynamic linking issue, likely because either libtinfo
> is not available or the version on your system is older or newer than
> the one that the compiler was built with.
> 
> Intel folks, you can opt out of this particular library dependency with
> '-DLLVM_ENABLE_TERMINFO=OFF' to cmake, which will make it easier for
> others to use it; the compiler can still output color on most terminals
> even without libtinfo.
> 
> > tools/testing/selftests/arm64/tags/.gitignore: warning: ignored by one of the .gitignore files
> > tools/testing/selftests/arm64/tags/Makefile: warning: ignored by one of the .gitignore files
> > tools/testing/selftests/arm64/tags/run_tags_test.sh: warning: ignored by one of the .gitignore files
> > tools/testing/selftests/arm64/tags/tags_test.c: warning: ignored by one of the .gitignore files
> > tools/testing/selftests/kvm/.gitignore: warning: ignored by one of the .gitignore files
> > tools/testing/selftests/kvm/Makefile: warning: ignored by one of the .gitignore files
> > tools/testing/selftests/kvm/config: warning: ignored by one of the .gitignore files
> > tools/testing/selftests/kvm/settings: warning: ignored by one of the .gitignore files
> >   CALL    ../scripts/checksyscalls.sh
> > clang: /lib64/libtinfo.so.6: no version information available (required by clang)
> > <stdin>:1519:2: warning: syscall clone3 not implemented [-W#warnings]
> >  1519 | #warning syscall clone3 not implemented
> >       |  ^
> > 1 warning generated.
> > make[1]: Leaving directory '/root/linux/build_dir'
> > [root@...l-pem620-01 linux]# 
> > 
> > 
> 
> I am able to reproduce this with the kernel.org LLVM builds that I do,
> which should not have that library dependency:
> 
> https://mirrors.edge.kernel.org/pub/tools/llvm/
> 
> $ curl -LSso .config https://download.01.org/0day-ci/archive/20230621/202306211030.DioMEPhl-lkp@intel.com/config
> 
> $ make -skj"$(nproc)" ARCH=hexagon LLVM=$(realpath llvm-16.0.6-x86_64/bin)/ olddefconfig all
> ...
> make[5]: *** No rule to make target 'arch/hexagon/mm/ioremap.o', needed by 'arch/hexagon/mm/built-in.a'.
> ...
> arch/hexagon/kernel/hexagon_ksyms.o: error: local symbol ioremap was exported
> ...
> 
> The first issue is resolved with:
> 
> diff --git a/arch/hexagon/mm/Makefile b/arch/hexagon/mm/Makefile
> index 49911a906fd0..ba4b04d962d6 100644
> --- a/arch/hexagon/mm/Makefile
> +++ b/arch/hexagon/mm/Makefile
> @@ -3,5 +3,5 @@
>  # Makefile for Hexagon memory management subsystem
>  #
>  
> -obj-y := init.o ioremap.o uaccess.o vm_fault.o cache.o
> +obj-y := init.o uaccess.o vm_fault.o cache.o
>  obj-y += copy_to_user.o copy_from_user.o vm_tlb.o

Ah, right, arch/hexagon/mm/ioremap.c is removed, I forgot change that in
Makefile. Thanks.

> 
> For the second issue, it seems that ioremap is exported in
> arch/hexagon/kernel/hexagon_ksyms.c but ioremap() is a static inline
> function with CONFIG_GENERIC_IOREMAP. I think we can just remove the
> ioremap and iounmap exports now, as ioremap() calls ioremap_prot(),
> which is exported, and iounmap() is exported in mm/ioremap.c.
> 
> diff --git a/arch/hexagon/kernel/hexagon_ksyms.c b/arch/hexagon/kernel/hexagon_ksyms.c
> index ec56ce2d92a2..36a80e31d187 100644
> --- a/arch/hexagon/kernel/hexagon_ksyms.c
> +++ b/arch/hexagon/kernel/hexagon_ksyms.c
> @@ -14,12 +14,10 @@
>  EXPORT_SYMBOL(__clear_user_hexagon);
>  EXPORT_SYMBOL(raw_copy_from_user);
>  EXPORT_SYMBOL(raw_copy_to_user);
> -EXPORT_SYMBOL(iounmap);
>  EXPORT_SYMBOL(__vmgetie);
>  EXPORT_SYMBOL(__vmsetie);
>  EXPORT_SYMBOL(__vmyield);
>  EXPORT_SYMBOL(empty_zero_page);
> -EXPORT_SYMBOL(ioremap);
>  EXPORT_SYMBOL(memcpy);
>  EXPORT_SYMBOL(memset);
>  
> 
> With those two diffs, the randconfig the robot provides builds and links
> without any errors.

Thanks a lot, I will add this into patch 02/19 of v8 post.