Re: [RFC PATCH v3] futex: Introduce __vdso_robust_futex_unlock_u32 and __vdso_robust_pi_futex_try_unlock_u32

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

Hi Mathieu,

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

[auto build test ERROR on tip/locking/core]
[also build test ERROR on linus/master v7.0-rc3 next-20260311]
[cannot apply to tip/x86/core tip/x86/vdso]
[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/Mathieu-Desnoyers/futex-Introduce-__vdso_robust_futex_unlock_u32-and-__vdso_robust_pi_futex_try_unlock_u32/20260313-201027
base:   tip/locking/core
patch link:    https://lore.kernel.org/r/20260312181850.2156985-1-mathieu.desnoyers%40efficios.com
patch subject: [RFC PATCH v3] futex: Introduce __vdso_robust_futex_unlock_u32 and __vdso_robust_pi_futex_try_unlock_u32
config: arm64-allnoconfig (https://download.01.org/0day-ci/archive/20260314/202603140547.Wi2MxToc-lkp@intel.com/config)
compiler: aarch64-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260314/202603140547.Wi2MxToc-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/202603140547.Wi2MxToc-lkp@intel.com/

All errors (new ones prefixed by >>):

   In file included from include/linux/sched.h:13,
                    from include/linux/percpu.h:12,
                    from arch/arm64/include/asm/arch_timer.h:18,
                    from arch/arm64/include/asm/timex.h:8,
                    from include/linux/timex.h:67,
                    from include/linux/time32.h:13,
                    from include/linux/time.h:60,
                    from include/linux/compat.h:10,
                    from kernel/futex/core.c:34:
   kernel/futex/core.c: In function 'handle_futex_death':
>> arch/arm64/include/asm/processor.h:384:43: error: implicit declaration of function 'task_stack_page'; did you mean 'task_stack_vm_area'? [-Wimplicit-function-declaration]
     384 |         ((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
         |                                           ^~~~~~~~~~~~~~~
   kernel/futex/core.c:1148:38: note: in expansion of macro 'task_pt_regs'
    1148 |                 futex_vdso_exception(task_pt_regs(curr), &in_futex_vdso, &vdso_need_action);
         |                                      ^~~~~~~~~~~~


vim +384 arch/arm64/include/asm/processor.h

2f79d2fc391e4ba Peter Collingbourne 2021-03-18  378  
9cce7a435f89c9e Catalin Marinas     2012-03-05  379  /* Thread switching */
9cce7a435f89c9e Catalin Marinas     2012-03-05  380  extern struct task_struct *cpu_switch_to(struct task_struct *prev,
9cce7a435f89c9e Catalin Marinas     2012-03-05  381  					 struct task_struct *next);
9cce7a435f89c9e Catalin Marinas     2012-03-05  382  
9cce7a435f89c9e Catalin Marinas     2012-03-05  383  #define task_pt_regs(p) \
34be98f4944f990 Ard Biesheuvel      2017-07-20 @384  	((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)
9cce7a435f89c9e Catalin Marinas     2012-03-05  385  

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