* Re: [PATCH v6 23/30] arm64: kpkeys: Ensure the linear map can be modified
[not found] <20260227175518.3728055-24-kevin.brodsky@arm.com>
@ 2026-02-27 22:56 ` kernel test robot
0 siblings, 0 replies; only message in thread
From: kernel test robot @ 2026-02-27 22:56 UTC (permalink / raw)
To: Kevin Brodsky, linux-hardening
Cc: llvm, oe-kbuild-all, linux-kernel, Kevin Brodsky, Andrew Morton,
Linux Memory Management List, Andy Lutomirski, Catalin Marinas,
Dave Hansen, David Hildenbrand, Ira Weiny, Jann Horn, Jeff Xu,
Joey Gouly, Kees Cook, Linus Walleij, Lorenzo Stoakes,
Marc Zyngier, Mark Brown, Matthew Wilcox, Maxwell Bland,
Mike Rapoport (IBM), Peter Zijlstra, Pierre Langlois,
Quentin Perret, Rick Edgecombe, Ryan Roberts, Thomas Gleixner,
Vlastimil Babka, Will Deacon, Yang Shi
Hi Kevin,
kernel test robot noticed the following build errors:
[auto build test ERROR on 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f]
url: https://github.com/intel-lab-lkp/linux/commits/Kevin-Brodsky/mm-Introduce-kpkeys/20260228-020115
base: 6de23f81a5e08be8fbf5e8d7e9febc72a5b5f27f
patch link: https://lore.kernel.org/r/20260227175518.3728055-24-kevin.brodsky%40arm.com
patch subject: [PATCH v6 23/30] arm64: kpkeys: Ensure the linear map can be modified
config: arm64-randconfig-001-20260228 (https://download.01.org/0day-ci/archive/20260228/202602280610.KQRFmbR3-lkp@intel.com/config)
compiler: clang version 23.0.0git (https://github.com/llvm/llvm-project 9a109fbb6e184ec9bcce10615949f598f4c974a9)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260228/202602280610.KQRFmbR3-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/202602280610.KQRFmbR3-lkp@intel.com/
All errors (new ones prefixed by >>):
>> arch/arm64/mm/pageattr.c:100:3: error: call to undeclared function 'arm64_supports_kpkeys_hardened_pgtables'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
100 | arm64_supports_kpkeys_hardened_pgtables();
| ^
1 error generated.
--
>> arch/arm64/mm/mmu.c:768:3: error: call to undeclared function 'arm64_supports_kpkeys_hardened_pgtables'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
768 | arm64_supports_kpkeys_hardened_pgtables();
| ^
1 error generated.
vim +/arm64_supports_kpkeys_hardened_pgtables +100 arch/arm64/mm/pageattr.c
86
87 bool can_set_direct_map(void)
88 {
89 /*
90 * rodata_full, DEBUG_PAGEALLOC and a Realm guest all require linear
91 * map to be mapped at page granularity, so that it is possible to
92 * protect/unprotect single pages.
93 *
94 * KFENCE pool requires page-granular mapping if initialized late.
95 *
96 * Realms need to make pages shared/protected at page granularity.
97 */
98 return rodata_full || debug_pagealloc_enabled() ||
99 arm64_kfence_can_set_direct_map() || is_realm_world() ||
> 100 arm64_supports_kpkeys_hardened_pgtables();
101 }
102
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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