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Date: Sat, 5 Jun 2021 10:59:06 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: kernel test robot <lkp@...el.com>
Cc: kbuild-all@...ts.01.org, clang-built-linux@...glegroups.com,
linux-kernel@...r.kernel.org, Michael Ellerman <mpe@...erman.id.au>
Subject: Re: arch/powerpc/mm/mem.c:53:12: error: no previous prototype for
function 'create_section_mapping'
Le 05/06/2021 à 05:11, kernel test robot a écrit :
> Hi Christophe,
>
> FYI, the error/warning still remains.
>
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head: ff6091075a687676d76b3beb24fa77389b387b00
> commit: b26e8f27253a47bff90972b987112fd8396e9b8d powerpc/mem: Move cache flushing functions into mm/cacheflush.c
> date: 7 weeks ago
Fixed by
https://patchwork.ozlabs.org/project/linuxppc-dev/patch/3e5b63bb3daab54a1eb9c20221c2e9528c4db9b3.1622883330.git.christophe.leroy@csgroup.eu/
Christophe
> config: powerpc-randconfig-r005-20210605 (attached as .config)
> compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 8ec9aa236e325fd4629cfeefac2919302e14d61a)
> 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
> # install powerpc cross compiling tool for clang build
> # apt-get install binutils-powerpc-linux-gnu
> # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b26e8f27253a47bff90972b987112fd8396e9b8d
> git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> git fetch --no-tags linus master
> git checkout b26e8f27253a47bff90972b987112fd8396e9b8d
> # save the attached .config to linux build tree
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
> ^
> arch/powerpc/include/asm/io.h:537:62: note: expanded from macro '__do_outl'
> #define __do_outl(val, port) writel(val,(PCI_IO_ADDR)_IO_BASE+port);
> ~~~~~~~~~~~~~~~~~~~~~^
> In file included from arch/powerpc/mm/mem.c:15:
> In file included from include/linux/memblock.h:14:
> In file included from arch/powerpc/include/asm/dma.h:22:
> In file included from arch/powerpc/include/asm/io.h:619:
> arch/powerpc/include/asm/io-defs.h:43:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
> DEF_PCI_AC_NORET(insb, (unsigned long p, void *b, unsigned long c),
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
> __do_##name al; \
> ^~~~~~~~~~~~~~
> <scratch space>:200:1: note: expanded from here
> __do_insb
> ^
> arch/powerpc/include/asm/io.h:556:56: note: expanded from macro '__do_insb'
> #define __do_insb(p, b, n) readsb((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
> ~~~~~~~~~~~~~~~~~~~~~^
> In file included from arch/powerpc/mm/mem.c:15:
> In file included from include/linux/memblock.h:14:
> In file included from arch/powerpc/include/asm/dma.h:22:
> In file included from arch/powerpc/include/asm/io.h:619:
> arch/powerpc/include/asm/io-defs.h:45:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
> DEF_PCI_AC_NORET(insw, (unsigned long p, void *b, unsigned long c),
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
> __do_##name al; \
> ^~~~~~~~~~~~~~
> <scratch space>:202:1: note: expanded from here
> __do_insw
> ^
> arch/powerpc/include/asm/io.h:557:56: note: expanded from macro '__do_insw'
> #define __do_insw(p, b, n) readsw((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
> ~~~~~~~~~~~~~~~~~~~~~^
> In file included from arch/powerpc/mm/mem.c:15:
> In file included from include/linux/memblock.h:14:
> In file included from arch/powerpc/include/asm/dma.h:22:
> In file included from arch/powerpc/include/asm/io.h:619:
> arch/powerpc/include/asm/io-defs.h:47:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
> DEF_PCI_AC_NORET(insl, (unsigned long p, void *b, unsigned long c),
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
> __do_##name al; \
> ^~~~~~~~~~~~~~
> <scratch space>:204:1: note: expanded from here
> __do_insl
> ^
> arch/powerpc/include/asm/io.h:558:56: note: expanded from macro '__do_insl'
> #define __do_insl(p, b, n) readsl((PCI_IO_ADDR)_IO_BASE+(p), (b), (n))
> ~~~~~~~~~~~~~~~~~~~~~^
> In file included from arch/powerpc/mm/mem.c:15:
> In file included from include/linux/memblock.h:14:
> In file included from arch/powerpc/include/asm/dma.h:22:
> In file included from arch/powerpc/include/asm/io.h:619:
> arch/powerpc/include/asm/io-defs.h:49:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
> DEF_PCI_AC_NORET(outsb, (unsigned long p, const void *b, unsigned long c),
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
> __do_##name al; \
> ^~~~~~~~~~~~~~
> <scratch space>:206:1: note: expanded from here
> __do_outsb
> ^
> arch/powerpc/include/asm/io.h:559:58: note: expanded from macro '__do_outsb'
> #define __do_outsb(p, b, n) writesb((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
> ~~~~~~~~~~~~~~~~~~~~~^
> In file included from arch/powerpc/mm/mem.c:15:
> In file included from include/linux/memblock.h:14:
> In file included from arch/powerpc/include/asm/dma.h:22:
> In file included from arch/powerpc/include/asm/io.h:619:
> arch/powerpc/include/asm/io-defs.h:51:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
> DEF_PCI_AC_NORET(outsw, (unsigned long p, const void *b, unsigned long c),
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
> __do_##name al; \
> ^~~~~~~~~~~~~~
> <scratch space>:208:1: note: expanded from here
> __do_outsw
> ^
> arch/powerpc/include/asm/io.h:560:58: note: expanded from macro '__do_outsw'
> #define __do_outsw(p, b, n) writesw((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
> ~~~~~~~~~~~~~~~~~~~~~^
> In file included from arch/powerpc/mm/mem.c:15:
> In file included from include/linux/memblock.h:14:
> In file included from arch/powerpc/include/asm/dma.h:22:
> In file included from arch/powerpc/include/asm/io.h:619:
> arch/powerpc/include/asm/io-defs.h:53:1: error: performing pointer arithmetic on a null pointer has undefined behavior [-Werror,-Wnull-pointer-arithmetic]
> DEF_PCI_AC_NORET(outsl, (unsigned long p, const void *b, unsigned long c),
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> arch/powerpc/include/asm/io.h:616:3: note: expanded from macro 'DEF_PCI_AC_NORET'
> __do_##name al; \
> ^~~~~~~~~~~~~~
> <scratch space>:210:1: note: expanded from here
> __do_outsl
> ^
> arch/powerpc/include/asm/io.h:561:58: note: expanded from macro '__do_outsl'
> #define __do_outsl(p, b, n) writesl((PCI_IO_ADDR)_IO_BASE+(p),(b),(n))
> ~~~~~~~~~~~~~~~~~~~~~^
>>> arch/powerpc/mm/mem.c:53:12: error: no previous prototype for function 'create_section_mapping' [-Werror,-Wmissing-prototypes]
> int __weak create_section_mapping(unsigned long start, unsigned long end,
> ^
> arch/powerpc/mm/mem.c:53:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
> int __weak create_section_mapping(unsigned long start, unsigned long end,
> ^
> static
> 14 errors generated.
>
>
> vim +/create_section_mapping +53 arch/powerpc/mm/mem.c
>
> bc02af93dd2bbd Yasunori Goto 2006-06-27 52
> 4e00c5affdd4b0 Logan Gunthorpe 2020-04-10 @53 int __weak create_section_mapping(unsigned long start, unsigned long end,
> 4e00c5affdd4b0 Logan Gunthorpe 2020-04-10 54 int nid, pgprot_t prot)
> fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 55 {
> fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 56 return -ENODEV;
> fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 57 }
> fecbfabe1dc940 Benjamin Herrenschmidt 2016-07-05 58
>
> :::::: The code at line 53 was first introduced by commit
> :::::: 4e00c5affdd4b04e6392001716333971932f3d0c powerpc/mm: thread pgprot_t through create_section_mapping()
>
> :::::: TO: Logan Gunthorpe <logang@...tatee.com>
> :::::: CC: Linus Torvalds <torvalds@...ux-foundation.org>
>
> ---
> 0-DAY CI Kernel Test Service, Intel Corporation
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
>
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