WARNING: modpost: vmlinux: section mismatch in reference: set_high_memory+0x8c (section: .text.unlikely) -> zone_movable_pfn (section: .init.data)

WARNING: modpost: vmlinux: section mismatch in reference: set_high_memory+0x8c (section: .text.unlikely) -> zone_movable_pfn (section: .init.data)

[kernel test robot]

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   01f95500a162fca88cefab9ed64ceded5afabc12
commit: e120d1bc12da5c1bb871c346f741296610fd6fcb arch, mm: set high_memory in free_area_init()
date:   7 weeks ago
config: arm-randconfig-r062-20250506 (https://download.01.org/0day-ci/archive/20250506/202505060901.Qcs06UoB-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 10.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250506/202505060901.Qcs06UoB-lkp@intel.com/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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505060901.Qcs06UoB-lkp@intel.com/

All warnings (new ones prefixed by >>, old ones prefixed by <<):

>> WARNING: modpost: vmlinux: section mismatch in reference: set_high_memory+0x8c (section: .text.unlikely) -> zone_movable_pfn (section: .init.data)

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki

Re: WARNING: modpost: vmlinux: section mismatch in reference: set_high_memory+0x8c (section: .text.unlikely) -> zone_movable_pfn (section: .init.data)

[Oscar Salvador]

On Tue, May 06, 2025 at 09:42:54AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   01f95500a162fca88cefab9ed64ceded5afabc12
> commit: e120d1bc12da5c1bb871c346f741296610fd6fcb arch, mm: set high_memory in free_area_init()
> date:   7 weeks ago
> config: arm-randconfig-r062-20250506 (https://download.01.org/0day-ci/archive/20250506/202505060901.Qcs06UoB-lkp@intel.com/config)
> compiler: arm-linux-gnueabi-gcc (GCC) 10.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250506/202505060901.Qcs06UoB-lkp@intel.com/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@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202505060901.Qcs06UoB-lkp@intel.com/
> 
> All warnings (new ones prefixed by >>, old ones prefixed by <<):
> 
> >> WARNING: modpost: vmlinux: section mismatch in reference: set_high_memory+0x8c (section: .text.unlikely) -> zone_movable_pfn (section: .init.data)

Perhaps?

 diff --git a/mm/mm_init.c b/mm/mm_init.c
 index 80a5370ac6ab..5efec0399e18 100644
 --- a/mm/mm_init.c
 +++ b/mm/mm_init.c
 @@ -1785,7 +1785,7 @@ static bool arch_has_descending_max_zone_pfns(void)
  	return IS_ENABLED(CONFIG_ARC) && !IS_ENABLED(CONFIG_ARC_HAS_PAE40);
  }
 
 -static void set_high_memory(void)
 +static void __init set_high_memory(void)
  {
  	phys_addr_t highmem = memblock_end_of_DRAM();


-- 
Oscar Salvador
SUSE Labs

Re: WARNING: modpost: vmlinux: section mismatch in reference: set_high_memory+0x8c (section: .text.unlikely) -> zone_movable_pfn (section: .init.data)

[Mike Rapoport]

On Tue, May 06, 2025 at 09:29:08AM +0200, Oscar Salvador wrote:
> On Tue, May 06, 2025 at 09:42:54AM +0800, kernel test robot wrote:
> > tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > head:   01f95500a162fca88cefab9ed64ceded5afabc12
> > commit: e120d1bc12da5c1bb871c346f741296610fd6fcb arch, mm: set high_memory in free_area_init()
> > date:   7 weeks ago
> > config: arm-randconfig-r062-20250506 (https://download.01.org/0day-ci/archive/20250506/202505060901.Qcs06UoB-lkp@intel.com/config)
> > compiler: arm-linux-gnueabi-gcc (GCC) 10.5.0
> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250506/202505060901.Qcs06UoB-lkp@intel.com/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@intel.com>
> > | Closes: https://lore.kernel.org/oe-kbuild-all/202505060901.Qcs06UoB-lkp@intel.com/
> > 
> > All warnings (new ones prefixed by >>, old ones prefixed by <<):
> > 
> > >> WARNING: modpost: vmlinux: section mismatch in reference: set_high_memory+0x8c (section: .text.unlikely) -> zone_movable_pfn (section: .init.data)
> 
> Perhaps?

Looks right, thanks for a quick fix!
Care sending a formal patch?
 
>  diff --git a/mm/mm_init.c b/mm/mm_init.c
>  index 80a5370ac6ab..5efec0399e18 100644
>  --- a/mm/mm_init.c
>  +++ b/mm/mm_init.c
>  @@ -1785,7 +1785,7 @@ static bool arch_has_descending_max_zone_pfns(void)
>   	return IS_ENABLED(CONFIG_ARC) && !IS_ENABLED(CONFIG_ARC_HAS_PAE40);
>   }
>  
>  -static void set_high_memory(void)
>  +static void __init set_high_memory(void)
>   {
>   	phys_addr_t highmem = memblock_end_of_DRAM();
> 
> 
> -- 
> Oscar Salvador
> SUSE Labs
> 

-- 
Sincerely yours,
Mike.