From: kernel test robot <lkp@intel.com>
To: Alexei Starovoitov <ast@kernel.org>
Cc: oe-kbuild-all@lists.linux.dev
Subject: [ast-bpf:arena_slab 63/63] kernel/bpf/arena.c:963:15: error: 'struct slab' has no member named 'obj_exts'; did you mean 'objects'?
Date: Wed, 20 May 2026 12:37:36 +0800 [thread overview]
Message-ID: <202605201210.BlkPbSSh-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/ast/bpf.git arena_slab
head: cb83f972bd005841d18f7bbff6e50d9bcbf0adf8
commit: cb83f972bd005841d18f7bbff6e50d9bcbf0adf8 [63/63] bpf,slab: Add slub-backed allocator for bpf_arena
config: x86_64-buildonly-randconfig-004 (https://download.01.org/0day-ci/archive/20260520/202605201210.BlkPbSSh-lkp@intel.com/config)
compiler: gcc-14 (Debian 14.2.0-19) 14.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260520/202605201210.BlkPbSSh-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/202605201210.BlkPbSSh-lkp@intel.com/
All errors (new ones prefixed by >>):
kernel/bpf/arena.c: In function 'arena_alloc_slab_page':
>> kernel/bpf/arena.c:963:15: error: 'struct slab' has no member named 'obj_exts'; did you mean 'objects'?
963 | slab->obj_exts = (unsigned long)uaddr32 | BIT_ULL(63);
| ^~~~~~~~
| objects
In file included from <command-line>:
kernel/bpf/arena.c: In function 'arena_slab_uaddr32':
>> kernel/bpf/arena.c:974:47: error: 'const struct slab' has no member named 'obj_exts'; did you mean 'objects'?
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~
include/linux/compiler_types.h:679:23: note: in definition of macro '__compiletime_assert'
679 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
699 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/arena.c:974:31: note: in expansion of macro 'READ_ONCE'
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~~
>> kernel/bpf/arena.c:974:47: error: 'const struct slab' has no member named 'obj_exts'; did you mean 'objects'?
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~
include/linux/compiler_types.h:679:23: note: in definition of macro '__compiletime_assert'
679 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
699 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/arena.c:974:31: note: in expansion of macro 'READ_ONCE'
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~~
>> kernel/bpf/arena.c:974:47: error: 'const struct slab' has no member named 'obj_exts'; did you mean 'objects'?
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~
include/linux/compiler_types.h:679:23: note: in definition of macro '__compiletime_assert'
679 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
699 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/arena.c:974:31: note: in expansion of macro 'READ_ONCE'
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~~
>> kernel/bpf/arena.c:974:47: error: 'const struct slab' has no member named 'obj_exts'; did you mean 'objects'?
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~
include/linux/compiler_types.h:679:23: note: in definition of macro '__compiletime_assert'
679 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
699 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/arena.c:974:31: note: in expansion of macro 'READ_ONCE'
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~~
>> kernel/bpf/arena.c:974:47: error: 'const struct slab' has no member named 'obj_exts'; did you mean 'objects'?
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~
include/linux/compiler_types.h:679:23: note: in definition of macro '__compiletime_assert'
679 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
699 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:49:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
49 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/arena.c:974:31: note: in expansion of macro 'READ_ONCE'
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~~
>> kernel/bpf/arena.c:974:47: error: 'const struct slab' has no member named 'obj_exts'; did you mean 'objects'?
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~
include/linux/compiler_types.h:635:53: note: in definition of macro '__unqual_scalar_typeof'
635 | #define __unqual_scalar_typeof(x) __typeof_unqual__(x)
| ^
include/asm-generic/rwonce.h:50:9: note: in expansion of macro '__READ_ONCE'
50 | __READ_ONCE(x); \
| ^~~~~~~~~~~
kernel/bpf/arena.c:974:31: note: in expansion of macro 'READ_ONCE'
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~~
In file included from ./arch/x86/include/generated/asm/rwonce.h:1,
from include/linux/compiler.h:369,
from include/uapi/linux/filter.h:9,
from include/linux/bpf.h:8,
from kernel/bpf/arena.c:3:
>> kernel/bpf/arena.c:974:47: error: 'const struct slab' has no member named 'obj_exts'; did you mean 'objects'?
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~
include/asm-generic/rwonce.h:44:73: note: in definition of macro '__READ_ONCE'
44 | #define __READ_ONCE(x) (*(const volatile __unqual_scalar_typeof(x) *)&(x))
| ^
kernel/bpf/arena.c:974:31: note: in expansion of macro 'READ_ONCE'
974 | unsigned long stash = READ_ONCE(slab->obj_exts);
| ^~~~~~~~~
kernel/bpf/arena.c: In function 'arena_free_slab_page':
kernel/bpf/arena.c:988:26: error: 'struct slab' has no member named 'obj_exts'; did you mean 'objects'?
988 | WRITE_ONCE(slab->obj_exts, 0);
| ^~~~~~~~
include/linux/compiler_types.h:679:23: note: in definition of macro '__compiletime_assert'
679 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
699 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
60 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/arena.c:988:9: note: in expansion of macro 'WRITE_ONCE'
988 | WRITE_ONCE(slab->obj_exts, 0);
| ^~~~~~~~~~
kernel/bpf/arena.c:988:26: error: 'struct slab' has no member named 'obj_exts'; did you mean 'objects'?
988 | WRITE_ONCE(slab->obj_exts, 0);
| ^~~~~~~~
include/linux/compiler_types.h:679:23: note: in definition of macro '__compiletime_assert'
679 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
699 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
60 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/arena.c:988:9: note: in expansion of macro 'WRITE_ONCE'
988 | WRITE_ONCE(slab->obj_exts, 0);
| ^~~~~~~~~~
kernel/bpf/arena.c:988:26: error: 'struct slab' has no member named 'obj_exts'; did you mean 'objects'?
988 | WRITE_ONCE(slab->obj_exts, 0);
| ^~~~~~~~
include/linux/compiler_types.h:679:23: note: in definition of macro '__compiletime_assert'
679 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
699 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
60 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/arena.c:988:9: note: in expansion of macro 'WRITE_ONCE'
988 | WRITE_ONCE(slab->obj_exts, 0);
| ^~~~~~~~~~
kernel/bpf/arena.c:988:26: error: 'struct slab' has no member named 'obj_exts'; did you mean 'objects'?
988 | WRITE_ONCE(slab->obj_exts, 0);
| ^~~~~~~~
include/linux/compiler_types.h:679:23: note: in definition of macro '__compiletime_assert'
679 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
699 | _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
| ^~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:9: note: in expansion of macro 'compiletime_assert'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:36:28: note: in expansion of macro '__native_word'
36 | compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long), \
| ^~~~~~~~~~~~~
include/asm-generic/rwonce.h:60:9: note: in expansion of macro 'compiletime_assert_rwonce_type'
60 | compiletime_assert_rwonce_type(x); \
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/bpf/arena.c:988:9: note: in expansion of macro 'WRITE_ONCE'
988 | WRITE_ONCE(slab->obj_exts, 0);
| ^~~~~~~~~~
kernel/bpf/arena.c:988:26: error: 'struct slab' has no member named 'obj_exts'; did you mean 'objects'?
988 | WRITE_ONCE(slab->obj_exts, 0);
| ^~~~~~~~
include/linux/compiler_types.h:679:23: note: in definition of macro '__compiletime_assert'
679 | if (!(condition)) \
| ^~~~~~~~~
include/linux/compiler_types.h:699:9: note: in expansion of macro '_compiletime_assert'
vim +963 kernel/bpf/arena.c
917
918 /*
919 * SLAB_BPF_ARENA support: each arena owns a set of kmem_cache buckets that
920 * back kmalloc-style alloc/free for BPF programs. Slab pages are drawn from
921 * the arena's page pool, but slub treats them as ordinary direct-map kernel
922 * memory (slab_address/virt_to_slab/freepointers all use direct-map VAs).
923 * The arena's vmalloc mapping is what BPF programs see; bpf_arena_alloc/free
924 * translate between direct-map and arena offset in O(1) by reading the slab
925 * page's arena uaddr32 stashed in slab->obj_exts.
926 */
927
928 static struct slab *arena_alloc_slab_page(void *arena_p, gfp_t flags, int node,
929 unsigned int order, bool allow_spin)
930 {
931 struct bpf_arena *arena = arena_p;
932 long ret_user_va;
933 u32 uaddr32;
934 void *kva;
935 struct page *page;
936 struct slab *slab;
937
938 if (order)
939 return NULL;
940
941 /* Propagate allow_spin to the arena page allocator; non-sleeping
942 * contexts (BPF NMI/irq-off) take the best-effort path.
943 */
944 ret_user_va = arena_alloc_pages(arena, 0, 1, node, allow_spin);
945 if (!ret_user_va)
946 return NULL;
947
948 uaddr32 = (u32)ret_user_va;
949 kva = (void *)(bpf_arena_get_kern_vm_start(arena) + uaddr32);
950
951 page = vmalloc_to_page(kva);
952 if (WARN_ON_ONCE(!page))
953 goto fail;
954
955 __SetPageSlab(page);
956 slab = page_slab(page);
957 /*
958 * Stash this slab page's arena offset in obj_exts. allocate_slab()
959 * skips init_slab_obj_exts() for SLAB_BPF_ARENA caches, so this
960 * survives until __free_slab(). High bit set as a presence sentinel
961 * (uaddr32 < 4GB so bit 63 is always free).
962 */
> 963 slab->obj_exts = (unsigned long)uaddr32 | BIT_ULL(63);
964 WRITE_ONCE(arena->slab_pages[uaddr32 >> PAGE_SHIFT], page);
965
966 return slab;
967 fail:
968 arena_free_pages(arena, uaddr32, 1, true);
969 return NULL;
970 }
971
972 static u32 arena_slab_uaddr32(const struct slab *slab)
973 {
> 974 unsigned long stash = READ_ONCE(slab->obj_exts);
975
976 if (WARN_ON_ONCE(!(stash & BIT_ULL(63))))
977 return 0;
978 return (u32)stash;
979 }
980
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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