| Message ID | 20240201-exception_ip-v1-3-aa26ab3ee0b5@flygoat.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Handle delay slot for extable lookup | expand |
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@intel.com/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@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/202402032150.DmM8VjRz-lkp@intel.com/ 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
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: arm64-randconfig-001-20240203 (https://download.01.org/0day-ci/archive/20240203/202402032112.NBimLx5h-lkp@intel.com/config) compiler: clang version 15.0.7 (https://github.com/llvm/llvm-project.git 8dfdcc7b7bf66834a761bd8de445840ef68e4d1a) reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240203/202402032112.NBimLx5h-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/202402032112.NBimLx5h-lkp@intel.com/ All errors (new ones prefixed by >>): >> mm/memory.c:5484:22: error: call to undeclared function 'exception_ip'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration] unsigned long ip = exception_ip(regs); ^ mm/memory.c:5509:22: error: call to undeclared function 'exception_ip'; ISO C99 and later do not support implicit function declarations [-Werror,-Wimplicit-function-declaration] unsigned long ip = exception_ip(regs); ^ 2 errors generated. 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
diff --git a/mm/memory.c b/mm/memory.c index 8d14ba440929..49433612444a 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -5481,7 +5481,7 @@ static inline bool get_mmap_lock_carefully(struct mm_struct *mm, struct pt_regs return true; if (regs && !user_mode(regs)) { - unsigned long ip = instruction_pointer(regs); + unsigned long ip = exception_ip(regs); if (!search_exception_tables(ip)) return false; } @@ -5506,7 +5506,7 @@ static inline bool upgrade_mmap_lock_carefully(struct mm_struct *mm, struct pt_r { mmap_read_unlock(mm); if (regs && !user_mode(regs)) { - unsigned long ip = instruction_pointer(regs); + unsigned long ip = exception_ip(regs); if (!search_exception_tables(ip)) return false; }
On architectures with delay slot, instruction_pointer() may differ from where exception was triggered. Use exception_ip we just introduced to search exception tables to get rid of the problem. Fixes: 4bce37a68ff8 ("mips/mm: Convert to using lock_mm_and_find_vma()") Reported-by: Xi Ruoyao <xry111@xry111.site> Link: https://lore.kernel.org/r/75e9fd7b08562ad9b456a5bdaacb7cc220311cc9.camel@xry111.site/ Suggested-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com> --- mm/memory.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)