Re: [PATCH] mm/page_alloc: Add lockdep assertion for pageblock type change

[Johannes Weiner <hannes@cmpxchg.org>]

On Sat, Mar 01, 2025 at 01:31:30AM +0800, kernel test robot wrote:
> Hi Brendan,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on d58172d128acbafa2295aa17cc96e28260da9a86]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Brendan-Jackman/mm-page_alloc-Add-lockdep-assertion-for-pageblock-type-change/20250228-002107
> base:   d58172d128acbafa2295aa17cc96e28260da9a86
> patch link:    https://lore.kernel.org/r/20250227-pageblock-lockdep-v1-1-3701efb331bb%40google.com
> patch subject: [PATCH] mm/page_alloc: Add lockdep assertion for pageblock type change
> config: x86_64-buildonly-randconfig-002-20250228 (https://download.01.org/0day-ci/archive/20250301/202503010129.rJvGqZN1-lkp@intel.com/config)
> compiler: clang version 19.1.7 (https://github.com/llvm/llvm-project cd708029e0b2869e80abe31ddb175f7c35361f90)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250301/202503010129.rJvGqZN1-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/202503010129.rJvGqZN1-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from mm/page_alloc.c:19:
>    In file included from include/linux/mm.h:2302:
>    include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
>      518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
>          |                               ~~~~~~~~~~~ ^ ~~~
>    In file included from mm/page_alloc.c:44:
>    include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
>       47 |         __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
>          |                                    ~~~~~~~~~~~ ^ ~~~
>    include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
>       49 |                                 NR_ZONE_LRU_BASE + lru, nr_pages);
>          |                                 ~~~~~~~~~~~~~~~~ ^ ~~~
> >> mm/page_alloc.c:421:3: error: call to undeclared function 'in_mem_hotplug'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
>      421 |                 in_mem_hotplug() ||

The patch is missing a dummy in_mem_hotplug() in the
!CONFIG_MEMORY_HOTPLUG section of <linux/memory_hotplug.h>.