[mingo-tip:sched/headers 1791/2308] arch/x86/entry/vsyscall/vsyscall_64.c:323:24: warning: no previous prototype for 'get_gate_vma'

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

tree:   git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git sched/headers
head:   ef90a8d1de7ff54bfd0fcfe6371c20f544b14d6d
commit: a225f3c5267e5fcd7fc93714b68702c9af291dd4 [1791/2308] headers/deps: mm: Optimize <linux/mm_api.h>, remove the <linux/mm_api_gate_area.h> header
config: x86_64-randconfig-c022-20220314 (https://download.01.org/0day-ci/archive/20220318/202203180128.4e09OmYA-lkp@intel.com/config)
compiler: gcc-9 (Ubuntu 9.4.0-1ubuntu1~20.04) 9.4.0
reproduce (this is a W=1 build):
        # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=a225f3c5267e5fcd7fc93714b68702c9af291dd4
        git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git
        git fetch --no-tags mingo-tip sched/headers
        git checkout a225f3c5267e5fcd7fc93714b68702c9af291dd4
        # save the config file to linux build tree
        mkdir build_dir
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash arch/x86/entry/vsyscall/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> arch/x86/entry/vsyscall/vsyscall_64.c:323:24: warning: no previous prototype for 'get_gate_vma' [-Wmissing-prototypes]
     323 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
         |                        ^~~~~~~~~~~~
>> arch/x86/entry/vsyscall/vsyscall_64.c:334:5: warning: no previous prototype for 'in_gate_area' [-Wmissing-prototypes]
     334 | int in_gate_area(struct mm_struct *mm, unsigned long addr)
         |     ^~~~~~~~~~~~
>> arch/x86/entry/vsyscall/vsyscall_64.c:349:5: warning: no previous prototype for 'in_gate_area_no_mm' [-Wmissing-prototypes]
     349 | int in_gate_area_no_mm(unsigned long addr)
         |     ^~~~~~~~~~~~~~~~~~


vim +/get_gate_vma +323 arch/x86/entry/vsyscall/vsyscall_64.c

b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  322  
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23 @323  struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  324  {
c338867d0e4224 arch/x86/entry/vsyscall/vsyscall_64.c Brian Gerst             2015-06-22  325  #ifdef CONFIG_COMPAT
ff170cd0595398 arch/x86/entry/vsyscall/vsyscall_64.c Gabriel Krisman Bertazi 2020-10-03  326  	if (!mm || !(mm->context.flags & MM_CONTEXT_HAS_VSYSCALL))
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  327  		return NULL;
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  328  #endif
87983c66bc02c9 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-10-29  329  	if (vsyscall_mode == NONE)
87983c66bc02c9 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-10-29  330  		return NULL;
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  331  	return &gate_vma;
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  332  }
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  333  
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23 @334  int in_gate_area(struct mm_struct *mm, unsigned long addr)
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  335  {
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  336  	struct vm_area_struct *vma = get_gate_vma(mm);
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  337  
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  338  	if (!vma)
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  339  		return 0;
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  340  
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  341  	return (addr >= vma->vm_start) && (addr < vma->vm_end);
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  342  }
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  343  
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  344  /*
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  345   * Use this when you have no reliable mm, typically from interrupt
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  346   * context. It is less reliable than using a task's mm and may give
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  347   * false positives.
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  348   */
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23 @349  int in_gate_area_no_mm(unsigned long addr)
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  350  {
87983c66bc02c9 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-10-29  351  	return vsyscall_mode != NONE && (addr & PAGE_MASK) == VSYSCALL_ADDR;
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  352  }
b93590901a01a6 arch/x86/kernel/vsyscall_64.c         Andy Lutomirski         2014-09-23  353  

:::::: The code at line 323 was first introduced by commit
:::::: b93590901a01a6d036b3b7c856bcc5724fdb9911 x86_64/vsyscall: Move all of the gate_area code to vsyscall_64.c

:::::: TO: Andy Lutomirski <luto@amacapital.net>
:::::: CC: Ingo Molnar <mingo@kernel.org>

---
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