* Re: [PATCH 10/26] mm: asi: Avoid warning from NMI userspace accesses in ASI context
[not found] <20240712-asi-rfc-24-v1-10-144b319a40d8@google.com>
@ 2024-07-14 3:59 ` kernel test robot
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From: kernel test robot @ 2024-07-14 3:59 UTC (permalink / raw)
To: Brendan Jackman, Thomas Gleixner, Ingo Molnar, Borislav Petkov,
Dave Hansen, H. Peter Anvin, Andy Lutomirski, Peter Zijlstra,
Sean Christopherson, Paolo Bonzini, Alexandre Chartre, Liran Alon,
Jan Setje-Eilers, Catalin Marinas, Will Deacon, Mark Rutland,
Andrew Morton, Mel Gorman, Lorenzo Stoakes, David Hildenbrand,
Vlastimil Babka, Michal Hocko, Khalid Aziz, Juri Lelli,
Vincent Guittot, Dietmar Eggemann, Steven Rostedt,
Valentin Schneider, Paul Turner, Reiji Watanabe
Cc: llvm, oe-kbuild-all, Linux Memory Management List
Hi Brendan,
kernel test robot noticed the following build warnings:
[auto build test WARNING on a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6]
url: https://github.com/intel-lab-lkp/linux/commits/Brendan-Jackman/mm-asi-Make-some-utility-functions-noinstr-compatible/20240713-012107
base: a38297e3fb012ddfa7ce0321a7e5a8daeb1872b6
patch link: https://lore.kernel.org/r/20240712-asi-rfc-24-v1-10-144b319a40d8%40google.com
patch subject: [PATCH 10/26] mm: asi: Avoid warning from NMI userspace accesses in ASI context
config: i386-buildonly-randconfig-004-20240714 (https://download.01.org/0day-ci/archive/20240714/202407141109.Vpmj3Sze-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240714/202407141109.Vpmj3Sze-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/202407141109.Vpmj3Sze-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> arch/x86/mm/tlb.c:1329:20: warning: function 'cr3_matches_current_mm' is not needed and will not be emitted [-Wunneeded-internal-declaration]
1329 | static inline bool cr3_matches_current_mm(void)
| ^~~~~~~~~~~~~~~~~~~~~~
1 warning generated.
vim +/cr3_matches_current_mm +1329 arch/x86/mm/tlb.c
1328
> 1329 static inline bool cr3_matches_current_mm(void)
1330 {
1331 struct asi *asi = asi_get_current();
1332 pgd_t *cr3_pgd;
1333
1334 /*
1335 * Prevent read_cr3_pa -> [NMI, asi_exit] -> asi_get_current,
1336 * otherwise we might find CR3 pointing to the ASI PGD but not
1337 * find a current ASI domain.
1338 */
1339 barrier();
1340 cr3_pgd = __va(read_cr3_pa());
1341
1342 if (cr3_pgd == current->mm->pgd)
1343 return true;
1344 return asi && (cr3_pgd == asi_pgd(asi));
1345 }
1346
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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2024-07-14 3:59 ` [PATCH 10/26] mm: asi: Avoid warning from NMI userspace accesses in ASI context kernel test robot
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