[PATCH 3/3] riscv: keep booting if KFENCE pool reservation fails
kernel test robot
lkp at intel.com
Wed Oct 28 19:28:33 PDT 2026
Hi Jackie,
kernel test robot noticed the following build errors:
[auto build test ERROR on 7be4bc52fd9e0e55dc9a2e0232b89427d2c4b614]
url: https://github.com/intel-lab-lkp/linux/commits/Jackie-Liu/kfence-fix-pool-cleanup-on-metadata-allocation-failure/20261026-202302
base: 7be4bc52fd9e0e55dc9a2e0232b89427d2c4b614
patch link: https://lore.kernel.org/r/58e3baebbf4e454725e6bde8b7a267fb71cfdaae.1793017074.git.liuyun01%40kylinos.cn
patch subject: [PATCH 3/3] riscv: keep booting if KFENCE pool reservation fails
config: riscv-randconfig-1001-20261029 (https://download.01.org/0day-ci/archive/20261029/202610290904.wbrEL97y-lkp@intel.com/config)
compiler: riscv64-linux-gcc (GCC) 15.3.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20261029/202610290904.wbrEL97y-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 at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202610290904.wbrEL97y-lkp@intel.com/
All errors (new ones prefixed by >>):
In file included from arch/riscv/mm/init.c:30:
arch/riscv/include/asm/kfence.h: In function 'kfence_protect_page':
>> arch/riscv/include/asm/kfence.h:21:22: error: implicit declaration of function 'virt_to_kpte'; did you mean 'virt_to_page'? [-Wimplicit-function-declaration]
21 | pte_t *pte = virt_to_kpte(addr);
| ^~~~~~~~~~~~
| virt_to_page
>> arch/riscv/include/asm/kfence.h:21:22: error: initialization of 'pte_t *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
>> arch/riscv/include/asm/kfence.h:24:17: error: implicit declaration of function 'set_pte'; did you mean 'set_pgd'? [-Wimplicit-function-declaration]
24 | set_pte(pte, __pte(pte_val(ptep_get(pte)) & ~_PAGE_PRESENT));
| ^~~~~~~
| set_pgd
In file included from arch/riscv/include/asm/thread_info.h:11,
from include/linux/thread_info.h:62,
from include/asm-generic/preempt.h:5,
from ./arch/riscv/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:107,
from include/linux/spinlock.h:56,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:7,
from include/linux/mm.h:8,
from arch/riscv/mm/init.c:10:
>> arch/riscv/include/asm/kfence.h:24:44: error: implicit declaration of function 'ptep_get' [-Wimplicit-function-declaration]
24 | set_pte(pte, __pte(pte_val(ptep_get(pte)) & ~_PAGE_PRESENT));
| ^~~~~~~~
arch/riscv/include/asm/page.h:75:37: note: in definition of macro '__pte'
75 | #define __pte(x) ((pte_t) { (x) })
| ^
arch/riscv/include/asm/kfence.h:24:36: note: in expansion of macro 'pte_val'
24 | set_pte(pte, __pte(pte_val(ptep_get(pte)) & ~_PAGE_PRESENT));
| ^~~~~~~
>> arch/riscv/include/asm/page.h:71:29: error: request for member 'pte' in something not a structure or union
71 | #define pte_val(x) ((x).pte)
| ^
arch/riscv/include/asm/page.h:75:37: note: in definition of macro '__pte'
75 | #define __pte(x) ((pte_t) { (x) })
| ^
arch/riscv/include/asm/kfence.h:24:36: note: in expansion of macro 'pte_val'
24 | set_pte(pte, __pte(pte_val(ptep_get(pte)) & ~_PAGE_PRESENT));
| ^~~~~~~
>> arch/riscv/include/asm/page.h:71:29: error: request for member 'pte' in something not a structure or union
71 | #define pte_val(x) ((x).pte)
| ^
arch/riscv/include/asm/page.h:75:37: note: in definition of macro '__pte'
75 | #define __pte(x) ((pte_t) { (x) })
| ^
arch/riscv/include/asm/kfence.h:26:36: note: in expansion of macro 'pte_val'
26 | set_pte(pte, __pte(pte_val(ptep_get(pte)) | _PAGE_PRESENT));
| ^~~~~~~
>> arch/riscv/include/asm/kfence.h:27:17: error: implicit declaration of function 'mark_new_valid_map' [-Wimplicit-function-declaration]
27 | mark_new_valid_map();
| ^~~~~~~~~~~~~~~~~~
>> arch/riscv/include/asm/kfence.h:31:9: error: implicit declaration of function 'local_flush_tlb_kernel_range'; did you mean 'local_flush_icache_range'? [-Wimplicit-function-declaration]
31 | local_flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
| local_flush_icache_range
vim +21 arch/riscv/include/asm/kfence.h
47513f243b452a Liu Shixin 2021-06-15 18
47513f243b452a Liu Shixin 2021-06-15 19 static inline bool kfence_protect_page(unsigned long addr, bool protect)
47513f243b452a Liu Shixin 2021-06-15 20 {
47513f243b452a Liu Shixin 2021-06-15 @21 pte_t *pte = virt_to_kpte(addr);
47513f243b452a Liu Shixin 2021-06-15 22
8d6c8c40e733b3 Vivian Wang 2026-03-03 23 if (protect) {
edf95564726942 Alexandre Ghiti 2023-12-13 @24 set_pte(pte, __pte(pte_val(ptep_get(pte)) & ~_PAGE_PRESENT));
8d6c8c40e733b3 Vivian Wang 2026-03-03 25 } else {
edf95564726942 Alexandre Ghiti 2023-12-13 26 set_pte(pte, __pte(pte_val(ptep_get(pte)) | _PAGE_PRESENT));
8d6c8c40e733b3 Vivian Wang 2026-03-03 @27 mark_new_valid_map();
8d6c8c40e733b3 Vivian Wang 2026-03-03 28 }
47513f243b452a Liu Shixin 2021-06-15 29
b3431a8bb336ce Alexandre Ghiti 2024-12-09 30 preempt_disable();
b3431a8bb336ce Alexandre Ghiti 2024-12-09 @31 local_flush_tlb_kernel_range(addr, addr + PAGE_SIZE);
b3431a8bb336ce Alexandre Ghiti 2024-12-09 32 preempt_enable();
47513f243b452a Liu Shixin 2021-06-15 33
47513f243b452a Liu Shixin 2021-06-15 34 return true;
47513f243b452a Liu Shixin 2021-06-15 35 }
47513f243b452a Liu Shixin 2021-06-15 36
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