Re: [PATCH 3/3] mm/memory: Use exception ip to search exception tables

From: kernel test robot
Date: Sat Feb 03 2024 - 08:17:01 EST


Hi Jiaxun,

kernel test robot noticed the following build errors:

[auto build test ERROR on 06f658aadff0e483ee4f807b0b46c9e5cba62bfa]

url: https://github.com/intel-lab-lkp/linux/commits/Jiaxun-Yang/ptrace-Introduce-exception_ip-arch-hook/20240201-234906
base: 06f658aadff0e483ee4f807b0b46c9e5cba62bfa
patch link: https://lore.kernel.org/r/20240201-exception_ip-v1-3-aa26ab3ee0b5%40flygoat.com
patch subject: [PATCH 3/3] mm/memory: Use exception ip to search exception tables
config: i386-buildonly-randconfig-002-20240203 (https://download.01.org/0day-ci/archive/20240203/202402032150.DmM8VjRz-lkp@xxxxxxxxx/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240203/202402032150.DmM8VjRz-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202402032150.DmM8VjRz-lkp@xxxxxxxxx/

All errors (new ones prefixed by >>):

mm/memory.c: In function 'get_mmap_lock_carefully':
>> mm/memory.c:5484:22: error: implicit declaration of function 'exception_ip' [-Werror=implicit-function-declaration]
unsigned long ip = exception_ip(regs);
^~~~~~~~~~~~
cc1: some warnings being treated as errors


vim +/exception_ip +5484 mm/memory.c

5477
5478 static inline bool get_mmap_lock_carefully(struct mm_struct *mm, struct pt_regs *regs)
5479 {
5480 if (likely(mmap_read_trylock(mm)))
5481 return true;
5482
5483 if (regs && !user_mode(regs)) {
> 5484 unsigned long ip = exception_ip(regs);
5485 if (!search_exception_tables(ip))
5486 return false;
5487 }
5488
5489 return !mmap_read_lock_killable(mm);
5490 }
5491

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