linux-kernel - Re: [stable:linux-5.10.y 2705/5321] WARNING: modpost: vmlinux.o(.text+0x8cc4): Section mismatch in reference from the function __arm_ioremap_pfn_caller() to the function .meminit.text:memblock_is_map

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Message-ID: <YmbEempwznDkAJ84@kroah.com>
Date:   Mon, 25 Apr 2022 17:55:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Mark-PK Tsai <mark-pk.tsai@...iatek.com>
Subject: Re: [stable:linux-5.10.y 2705/5321] WARNING: modpost:
 vmlinux.o(.text+0x8cc4): Section mismatch in reference from the function
 __arm_ioremap_pfn_caller() to the function
 .meminit.text:memblock_is_map_memory()

On Fri, Apr 22, 2022 at 01:42:42PM +0300, Mike Rapoport wrote:
> On Fri, Apr 22, 2022 at 07:37:19AM +0800, kernel test robot wrote:
> > Hi Mike,
> > 
> > FYI, the error/warning still remains.
> > 
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git linux-5.10.y
> > head:   1052f9bce62982023737a95b7ff1ad26a5149af6
> > commit: 8dd559d53b3b2de960ca1ec1359f5a9b4a12e181 [2705/5321] arm: ioremap: don't abuse pfn_valid() to check if pfn is in RAM
> > config: arm-hackkit_defconfig (https://download.01.org/0day-ci/archive/20220422/202204220723.zOZ7gZGT-lkp@intel.com/config)
> > compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 5bd87350a5ae429baf8f373cb226a57b62f87280)
> > 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 arm cross compiling tool for clang build
> >         # apt-get install binutils-arm-linux-gnueabi
> >         # https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git/commit/?id=8dd559d53b3b2de960ca1ec1359f5a9b4a12e181
> >         git remote add stable https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
> >         git fetch --no-tags stable linux-5.10.y
> >         git checkout 8dd559d53b3b2de960ca1ec1359f5a9b4a12e181
> >         # save the config file
> >         mkdir build_dir && cp config build_dir/.config
> >         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm SHELL=/bin/bash
> > 
> > If you fix the issue, kindly add following tag as appropriate
> > Reported-by: kernel test robot <lkp@...el.com>
> > 
> > All warnings (new ones prefixed by >>, old ones prefixed by <<):
> > 
> > >> WARNING: modpost: vmlinux.o(.text+0x8cc4): Section mismatch in reference from the function __arm_ioremap_pfn_caller() to the function .meminit.text:memblock_is_map_memory()
> > The function __arm_ioremap_pfn_caller() references
> > the function __meminit memblock_is_map_memory().
> > This is often because __arm_ioremap_pfn_caller lacks a __meminit
> > annotation or the annotation of memblock_is_map_memory is wrong.
> 
> In 5.10 the hackkit defconfig does not select ARCH_KEEP_MEMBLOCK which is
> required for memblock_is_map_memory() to function after boot.
> 
> In upstream kernels ARCH_KEEP_MEMBLOCK is always selected by ARM after
> commit 5e545df3292f ("arm: remove CONFIG_ARCH_HAS_HOLES_MEMORYMODEL")
> 
> So the fix would be either to backport 5e545df3292f or unconditionally
> select ARCH_KEEP_MEMBLOCK on ARM in 5.10.
> 
> (the same applies to 5.4)
> 
> Greg, what is your preference?

I'll defer to you all, but normally I prefer whatever is in Linus's
tree.

thanks,

greg k-h