Re: [PATCH bpf 1/3] bpf: fix mm lifecycle in open-coded task_vma iterator

[kernel test robot <lkp@intel.com>]

Hi Puranjay,

kernel test robot noticed the following build errors:

[auto build test ERROR on 3ebc98c1ae7efda949a015990280a097f4a5453a]

url:    https://github.com/intel-lab-lkp/linux/commits/Puranjay-Mohan/bpf-fix-mm-lifecycle-in-open-coded-task_vma-iterator/20260304-224301
base:   3ebc98c1ae7efda949a015990280a097f4a5453a
patch link:    https://lore.kernel.org/r/20260304142026.1443666-2-puranjay%40kernel.org
patch subject: [PATCH bpf 1/3] bpf: fix mm lifecycle in open-coded task_vma iterator
config: arm-randconfig-003-20260305 (https://download.01.org/0day-ci/archive/20260305/202603051628.H3HNsDUG-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 9a109fbb6e184ec9bcce10615949f598f4c974a9)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260305/202603051628.H3HNsDUG-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/202603051628.H3HNsDUG-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/bpf/task_iter.c:840:3: error: call to undeclared function 'mmput_async'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     840 |                 mmput_async(work->mm);
         |                 ^
   kernel/bpf/task_iter.c:848:3: error: call to undeclared function 'mmput_async'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     848 |                 mmput_async(mm);
         |                 ^
   2 errors generated.


vim +/mmput_async +840 kernel/bpf/task_iter.c

   833	
   834	static void do_bpf_iter_mmput(struct irq_work *entry)
   835	{
   836		struct bpf_iter_mmput_irq_work *work;
   837	
   838		work = container_of(entry, struct bpf_iter_mmput_irq_work, irq_work);
   839		if (work->mm) {
 > 840			mmput_async(work->mm);
   841			work->mm = NULL;
   842		}
   843	}
   844	

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