Re: [RFC PATCH] test: mm/arm: pgtable: remove young bit check for pte_valid_user

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

Hi Brian,

[This is a private test report for your RFC patch.]
kernel test robot noticed the following build warnings:

[auto build test WARNING on arm/for-next]
[also build test WARNING on akpm-mm/mm-everything arm-perf/for-next/perf arm64/for-next/core linus/master arm/fixes v7.0 next-20260414]
[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/Brian-Ruley/test-mm-arm-pgtable-remove-young-bit-check-for-pte_valid_user/20260414-235000
base:   git://git.armlinux.org.uk/~rmk/linux-arm.git for-next
patch link:    https://lore.kernel.org/r/20260410114336.983057-1-brian.ruley%40gehealthcare.com
patch subject: [RFC PATCH] test: mm/arm: pgtable: remove young bit check for pte_valid_user
config: arc-allyesconfig (https://download.01.org/0day-ci/archive/20260415/202604152036.dETGeqQ0-lkp@intel.com/config)
compiler: arc-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260415/202604152036.dETGeqQ0-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/202604152036.dETGeqQ0-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> mm/migrate.c:64:6: warning: no previous prototype for 'migrate_exec_log_add' [-Wmissing-prototypes]
      64 | void migrate_exec_log_add(unsigned long addr, unsigned long old_pfn,
         |      ^~~~~~~~~~~~~~~~~~~~
>> mm/migrate.c:79:6: warning: no previous prototype for 'migrate_exec_log_dump' [-Wmissing-prototypes]
      79 | void migrate_exec_log_dump(unsigned long fault_addr)
         |      ^~~~~~~~~~~~~~~~~~~~~


vim +/migrate_exec_log_add +64 mm/migrate.c

    63	
  > 64	void migrate_exec_log_add(unsigned long addr, unsigned long old_pfn,
    65				  unsigned long new_pfn, bool flushed)
    66	{
    67		unsigned int idx = __this_cpu_read(migrate_exec_idx);
    68		struct migrate_exec_entry *log = this_cpu_ptr(migrate_exec_log);
    69		struct migrate_exec_entry *e = &log[idx];
    70	
    71		e->addr = addr;
    72		e->old_pfn = old_pfn;
    73		e->new_pfn = new_pfn;
    74		e->pid = current->pid;
    75		e->flushed = flushed;
    76		__this_cpu_write(migrate_exec_idx, (idx + 1) % MIGRATE_EXEC_LOG_SIZE);
    77	}
    78	
  > 79	void migrate_exec_log_dump(unsigned long fault_addr)
    80	{
    81		int cpu;
    82	
    83		pr_err("SIGILL at %lx pid %d, recent exec migrations:\n",
    84		       fault_addr, current->pid);
    85		for_each_online_cpu(cpu) {
    86			struct migrate_exec_entry *log = per_cpu(migrate_exec_log, cpu);
    87			int i;
    88			for (i = 0; i < MIGRATE_EXEC_LOG_SIZE; i++) {
    89				if (log[i].addr == 0)
    90					continue;
    91				pr_err("  cpu%d: addr=%lx old_pfn=%lx new_pfn=%lx pid=%d flushed=%d%s\n",
    92				       cpu, log[i].addr, log[i].old_pfn, log[i].new_pfn,
    93				       log[i].pid, log[i].flushed,
    94				       (PAGE_ALIGN(fault_addr) == PAGE_ALIGN(log[i].addr)) ?
    95				       " *** MATCH ***" : "");
    96			}
    97		}
    98	}
    99	#include "internal.h"
   100	#include "swap.h"
   101	

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