linux-kernel - Re: [akpm-mm:mm-unstable 321/323] include/linux/pgtable.h:1713:10: error: redefinition of 'vm_get_page

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Date:   Sat, 2 Jul 2022 13:59:12 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     kernel test robot <lkp@...el.com>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: [akpm-mm:mm-unstable 321/323] include/linux/pgtable.h:1713:10:
 error: redefinition of 'vm_get_page_prot'

On Sun, 3 Jul 2022 02:16:09 +0800 kernel test robot <lkp@...el.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
> head:   706370e5c2ea7bb4544eee6e1172c4d68117a526
> commit: 5b0de55b24615b5f5f600e2a61c297a0432a5e82 [321/323] sh/mm: enable ARCH_HAS_VM_GET_PAGE_PROT
> config: sh-allmodconfig (https://download.01.org/0day-ci/archive/20220703/202207030224.tqi3q1Wh-lkp@intel.com/config)
> compiler: sh4-linux-gcc (GCC) 11.3.0
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/commit/?id=5b0de55b24615b5f5f600e2a61c297a0432a5e82
>         git remote add akpm-mm https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git
>         git fetch --no-tags akpm-mm mm-unstable
>         git checkout 5b0de55b24615b5f5f600e2a61c297a0432a5e82
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.3.0 make.cross W=1 O=build_dir ARCH=sh SHELL=/bin/bash
> 
> If you fix the issue, kindly add following tag where applicable
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from arch/sh/include/asm/io.h:21,
>                     from include/linux/io.h:13,
>                     from arch/sh/mm/mmap.c:10:
> >> include/linux/pgtable.h:1713:10: error: redefinition of 'vm_get_page_prot'
>     1713 | pgprot_t vm_get_page_prot(unsigned long vm_flags)                       \
>          |          ^~~~~~~~~~~~~~~~
>    arch/sh/mm/mmap.c:184:1: note: in expansion of macro 'DECLARE_VM_GET_PAGE_PROT'
>      184 | DECLARE_VM_GET_PAGE_PROT
>          | ^~~~~~~~~~~~~~~~~~~~~~~~
>    In file included from arch/sh/mm/mmap.c:11:
>    include/linux/mm.h:2864:24: note: previous definition of 'vm_get_page_prot' with type 'pgprot_t(long unsigned int)'
>     2864 | static inline pgprot_t vm_get_page_prot(unsigned long vm_flags)
>          |                        ^~~~~~~~~~~~~~~~
> 

um, OK, CONFIG_MMU=n.  I'll let Anshuman ponder this one.

btw, that macro should be called DEFINE_VM_GET_PAGE_PROT - it provides
a definition, not a declaration.