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:   Fri, 18 Mar 2022 14:15:07 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Mark Brown <broonie@...nel.org>
Cc:     kernel test robot <lkp@...el.com>, llvm@...ts.linux.dev,
        kbuild-all@...ts.01.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Michal Marek <michal.lkml@...kovi.net>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Linux Kbuild mailing list <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 Thu, Mar 17, 2022 at 2:05 AM Mark Brown <broonie@...nel.org> wrote:
>
> 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.


Do not add 'generated/' prefix.

Let's think about this scenario.
First foo.h was hard-coded, but sometime later,
somebody noticed it is better to generate it by scripting.
Why do we need to fix up #include <foo.h>  to #include <generated/foo.h>
in all the call sites?
Or do we need to have foo.h to wrap <generaged/foo.h> ?

No, users of foo.h do not need to know if it is
a checked-in header of a generated one.







>
> >    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



-- 
Best Regards
Masahiro Yamada