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Date: Fri, 18 Mar 2022 01:36:36 +0800
From: kernel test robot <lkp@...el.com>
To: Ingo Molnar <mingo@...nel.org>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [mingo-tip:sched/headers 1791/2308]
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 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@...el.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@...capital.net>
:::::: CC: Ingo Molnar <mingo@...nel.org>
---
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