Re: [PATCH v2 11/14] arm, crash: wrap crash dumping code into crash related ifdefs

[Baoquan He]

On 01/20/24 at 08:13pm, kernel test robot wrote:
> Hi Baoquan,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on linus/master]
> [cannot apply to tip/x86/core arm64/for-next/core powerpc/next powerpc/fixes v6.7 next-20240119]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Baoquan-He/kexec-split-crashkernel-reservation-code-out-from-crash_core-c/20240119-225820
> base:   linus/master
> patch link:    https://lore.kernel.org/r/20240119145241.769622-12-bhe%40redhat.com
> patch subject: [PATCH v2 11/14] arm, crash: wrap crash dumping code into crash related ifdefs
> config: arm-randconfig-001-20240120 (https://download.01.org/0day-ci/archive/20240120/202401202057.aPg08Eh8-lkp@xxxxxxxxx/config)
> compiler: clang version 18.0.0git (https://github.com/llvm/llvm-project d92ce344bf641e6bb025b41b3f1a77dd25e2b3e9)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240120/202401202057.aPg08Eh8-lkp@xxxxxxxxx/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202401202057.aPg08Eh8-lkp@xxxxxxxxx/

Thanks for reporting this, I can reproduce it.

In the provided config, it has:

# CONFIG_MMU is not set
and all kexec/kdump related config items are unset. 

The if (!IS_ENABLED(CONFIG_CRASH_RESERVE)) checking will cause funciton
reserve_crashkernel() is compiled, but not built in. With CONFIG_MMU=no,
SECTION_SIZE is undefined on arm. So fix it by wrapping up
reserve_crashkernel() inside CONFIG_CRASH_RESERVE ifdeffery scope.