linux-kernel - Re: [broonie-misc:arm64-sysreg-gen 6/9] arch/arm64/include/asm/sysreg.h:125:10: fatal error: 'generated/asm/sysreg.h' file not found

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Date:   Wed, 16 Mar 2022 17:05:09 +0000
From:   Mark Brown <broonie@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-kbuild@...r.kernel.org
Subject: Re: [broonie-misc:arm64-sysreg-gen 6/9]
 arch/arm64/include/asm/sysreg.h:125:10: fatal error:
 'generated/asm/sysreg.h' file not found

On Wed, Mar 16, 2022 at 05:56:39AM +0800, kernel test robot wrote:

Not deleting context for the benefit of the kbuild people I just CCed...

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc.git arm64-sysreg-gen
> head:   72b2ee21681c0c515c6a8bb62bd289766ce324a1
> commit: caf0e02eaa9ed9bfa50642f0bc2ee008b1c138ff [6/9] arm64/sysreg: Enable automatic generation of system register definitions
> config: arm64-randconfig-r006-20220313 (https://download.01.org/0day-ci/archive/20220316/202203160508.k7vz4ZxC-lkp@intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project a6b2f50fb47da3baeee10b1906da6e30ac5d26ec)
> 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 arm64 cross compiling tool for clang build
>         # apt-get install binutils-aarch64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc.git/commit/?id=caf0e02eaa9ed9bfa50642f0bc2ee008b1c138ff
>         git remote add broonie-misc https://git.kernel.org/pub/scm/linux/kernel/git/broonie/misc.git
>         git fetch --no-tags broonie-misc arm64-sysreg-gen
>         git checkout caf0e02eaa9ed9bfa50642f0bc2ee008b1c138ff
>         # save the config file to linux build tree
>         mkdir build_dir
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=arm64 prepare
> 
> 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 >>):
> 
>    In file included from kernel/bounds.c:10:
>    In file included from include/linux/page-flags.h:10:
>    In file included from include/linux/bug.h:5:
>    In file included from arch/arm64/include/asm/bug.h:26:
>    In file included from include/asm-generic/bug.h:22:
>    In file included from include/linux/printk.h:9:
>    In file included from include/linux/cache.h:6:
>    In file included from arch/arm64/include/asm/cache.h:8:
>    In file included from arch/arm64/include/asm/cputype.h:173:
> >> arch/arm64/include/asm/sysreg.h:125:10: fatal error: 'generated/asm/sysreg.h' file not found
>    #include "generated/asm/sysreg.h"
>             ^~~~~~~~~~~~~~~~~~~~~~~~
>    1 error generated.

This looks like a kbuild thing which as far as I can see only exists for
O= builds and possibly only with bounds.s - if I look at the full log I
see that we correctly generated asm/sysreg.h:

  GEN     arch/arm64/include/generated/asm/sysreg.h

but that's only passed to CC (at least for bounds.s) via an
-I./arch/arm64/include/generated so won't be found with the generated/
prefix.  While this can be avoided by renaming the header and not
referencing it with the prefix I do see a bunch of other headers
throughout the tree being included with an explicit generated/ prefix so
I'm not sure this is what's supposed to be happening, it does seem like
a landmine somehow.

>    make[2]: *** [scripts/Makefile.build:121: kernel/bounds.s] Error 1
>    make[2]: Target '__build' not remade because of errors.
>    make[1]: *** [Makefile:1191: prepare0] Error 2
>    make[1]: Target 'prepare' not remade because of errors.
>    make: *** [Makefile:219: __sub-make] Error 2
>    make: Target 'prepare' not remade because of errors.
> 
> 
> vim +125 arch/arm64/include/asm/sysreg.h
> 
>    118	
>    119	/*
>    120	 * Automatically generated definitions for system registers, the
>    121	 * manual encodings below are in the process of being converted to
>    122	 * come from here. The header relies on the definition of sys_reg()
>    123	 * earlier in this file.
>    124	 */
>  > 125	#include "generated/asm/sysreg.h"
>    126	
> 
> ---
> 0-DAY CI Kernel Test Service
> https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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