[kbuild-all] [mingo-tip:master 1863/2382] arch/x86/entry/vsyscall/vsyscall_64.c:323:24: warning: no previous prototype for 'get_gate_vma'

tree: git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git master head: 1a880941a087613ed42f77001229edfcf75ea8a5 commit: 8c564323537ccfe86a2423a4b98a423ab2182c9e [1863/2382] headers/deps: mm: Optimize <linux/mm_api.h>, remove the <linux/mm_api_gate_area.h> header config: x86_64-randconfig-a013 (https://download.01.org/0day-ci/archive/20220114/202201140224.O4rqby5c-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce (this is a W=1 build): # https://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git/commit/?id=... git remote add mingo-tip git://git.kernel.org/pub/scm/linux/kernel/git/mingo/tip.git git fetch --no-tags mingo-tip master git checkout 8c564323537ccfe86a2423a4b98a423ab2182c9e # 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(a)intel.com&gt; All warnings (new ones prefixed by >>): 323 | struct vm_area_struct *get_gate_vma(struct mm_struct *mm) | ^~~~~~~~~~~~ 334 | int in_gate_area(struct mm_struct *mm, unsigned long addr) | ^~~~~~~~~~~~ 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(a)amacapital.net&gt; :::::: CC: Ingo Molnar <mingo(a)kernel.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org