Re: kernel/bpf/helpers.c:1905:19: warning: no previous declaration for 'bpf_percpu_obj_new_impl'

From: Philip Li
Date: Thu Nov 02 2023 - 12:20:06 EST

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In reply to: Yonghong Song: "Re: kernel/bpf/helpers.c:1905:19: warning: no previous declaration for 'bpf_percpu_obj_new_impl'"
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On Thu, Nov 02, 2023 at 08:36:16AM -0700, Yonghong Song wrote:
>
> On 11/2/23 2:06 AM, Philip Li wrote:
> > On Thu, Nov 02, 2023 at 04:42:39PM +0800, kernel test robot wrote:
> > > Hi Yonghong,
> > Sorry, kindly ignore this report, it is similar one as https://lore.kernel.org/oe-kbuild-all/202309241550.JnHcYTZh-lkp@xxxxxxxxx/,
> > and we haven't fixed the bot side yet.
>
> The fix is just pushed to the bpf tree.
>
> https://lore.kernel.org/all/20231031215625.2343848-1-davemarchevsky@xxxxxx/

Got it, thanks for the info.

BTW: I found a few places in kernel only handle -Wmissing-prototypes but not
-Wmissing-declarations when using __diag_ignore_all. Initially the bot only
run with -Wno-missing-prototypes for old compiler, which leads to -Wmissing-declarations
warnings still being reported.

What the bot does now is run with both -Wno-missing-prototypes and -Wno-missing-declarations
now for gcc older than gcc-8.

>
>
> >
> > > FYI, the error/warning still remains.
> > >
> > > tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> > > head: 21e80f3841c01aeaf32d7aee7bbc87b3db1aa0c6
> > > commit: 36d8bdf75a93190e5669b9d1d95994e13e15ba1d bpf: Add alloc/xchg/direct_access support for local percpu kptr
> > > date: 8 weeks ago
> > > config: x86_64-buildonly-randconfig-006-20231102 (https://download.01.org/0day-ci/archive/20231102/202311021613.I5dZri9c-lkp@xxxxxxxxx/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/20231102/202311021613.I5dZri9c-lkp@xxxxxxxxx/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@xxxxxxxxx>
> > > | Closes: https://lore.kernel.org/oe-kbuild-all/202311021613.I5dZri9c-lkp@xxxxxxxxx/
> > >
> > > All warnings (new ones prefixed by >>):
> > >
> > > kernel/bpf/helpers.c:1891:19: warning: no previous declaration for 'bpf_obj_new_impl' [-Wmissing-declarations]
> > > __bpf_kfunc void *bpf_obj_new_impl(u64 local_type_id__k, void *meta__ign)
> > > ^~~~~~~~~~~~~~~~
> > > > > kernel/bpf/helpers.c:1905:19: warning: no previous declaration for 'bpf_percpu_obj_new_impl' [-Wmissing-declarations]
> > > __bpf_kfunc void *bpf_percpu_obj_new_impl(u64 local_type_id__k, void *meta__ign)
> > > ^~~~~~~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:1933:18: warning: no previous declaration for 'bpf_obj_drop_impl' [-Wmissing-declarations]
> > > __bpf_kfunc void bpf_obj_drop_impl(void *p__alloc, void *meta__ign)
> > > ^~~~~~~~~~~~~~~~~
> > > > > kernel/bpf/helpers.c:1941:18: warning: no previous declaration for 'bpf_percpu_obj_drop_impl' [-Wmissing-declarations]
> > > __bpf_kfunc void bpf_percpu_obj_drop_impl(void *p__alloc, void *meta__ign)
> > > ^~~~~~~~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:1947:19: warning: no previous declaration for 'bpf_refcount_acquire_impl' [-Wmissing-declarations]
> > > __bpf_kfunc void *bpf_refcount_acquire_impl(void *p__refcounted_kptr, void *meta__ign)
> > > ^~~~~~~~~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:1992:17: warning: no previous declaration for 'bpf_list_push_front_impl' [-Wmissing-declarations]
> > > __bpf_kfunc int bpf_list_push_front_impl(struct bpf_list_head *head,
> > > ^~~~~~~~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2002:17: warning: no previous declaration for 'bpf_list_push_back_impl' [-Wmissing-declarations]
> > > __bpf_kfunc int bpf_list_push_back_impl(struct bpf_list_head *head,
> > > ^~~~~~~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2035:35: warning: no previous declaration for 'bpf_list_pop_front' [-Wmissing-declarations]
> > > __bpf_kfunc struct bpf_list_node *bpf_list_pop_front(struct bpf_list_head *head)
> > > ^~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2040:35: warning: no previous declaration for 'bpf_list_pop_back' [-Wmissing-declarations]
> > > __bpf_kfunc struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *head)
> > > ^~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2045:33: warning: no previous declaration for 'bpf_rbtree_remove' [-Wmissing-declarations]
> > > __bpf_kfunc struct bpf_rb_node *bpf_rbtree_remove(struct bpf_rb_root *root,
> > > ^~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2101:17: warning: no previous declaration for 'bpf_rbtree_add_impl' [-Wmissing-declarations]
> > > __bpf_kfunc int bpf_rbtree_add_impl(struct bpf_rb_root *root, struct bpf_rb_node *node,
> > > ^~~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2111:33: warning: no previous declaration for 'bpf_rbtree_first' [-Wmissing-declarations]
> > > __bpf_kfunc struct bpf_rb_node *bpf_rbtree_first(struct bpf_rb_root *root)
> > > ^~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2124:33: warning: no previous declaration for 'bpf_task_acquire' [-Wmissing-declarations]
> > > __bpf_kfunc struct task_struct *bpf_task_acquire(struct task_struct *p)
> > > ^~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2135:18: warning: no previous declaration for 'bpf_task_release' [-Wmissing-declarations]
> > > __bpf_kfunc void bpf_task_release(struct task_struct *p)
> > > ^~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2224:33: warning: no previous declaration for 'bpf_task_from_pid' [-Wmissing-declarations]
> > > __bpf_kfunc struct task_struct *bpf_task_from_pid(s32 pid)
> > > ^~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2265:19: warning: no previous declaration for 'bpf_dynptr_slice' [-Wmissing-declarations]
> > > __bpf_kfunc void *bpf_dynptr_slice(const struct bpf_dynptr_kern *ptr, u32 offset,
> > > ^~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2349:19: warning: no previous declaration for 'bpf_dynptr_slice_rdwr' [-Wmissing-declarations]
> > > __bpf_kfunc void *bpf_dynptr_slice_rdwr(const struct bpf_dynptr_kern *ptr, u32 offset,
> > > ^~~~~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2380:17: warning: no previous declaration for 'bpf_dynptr_adjust' [-Wmissing-declarations]
> > > __bpf_kfunc int bpf_dynptr_adjust(struct bpf_dynptr_kern *ptr, u32 start, u32 end)
> > > ^~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2398:18: warning: no previous declaration for 'bpf_dynptr_is_null' [-Wmissing-declarations]
> > > __bpf_kfunc bool bpf_dynptr_is_null(struct bpf_dynptr_kern *ptr)
> > > ^~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2403:18: warning: no previous declaration for 'bpf_dynptr_is_rdonly' [-Wmissing-declarations]
> > > __bpf_kfunc bool bpf_dynptr_is_rdonly(struct bpf_dynptr_kern *ptr)
> > > ^~~~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2411:19: warning: no previous declaration for 'bpf_dynptr_size' [-Wmissing-declarations]
> > > __bpf_kfunc __u32 bpf_dynptr_size(const struct bpf_dynptr_kern *ptr)
> > > ^~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2419:17: warning: no previous declaration for 'bpf_dynptr_clone' [-Wmissing-declarations]
> > > __bpf_kfunc int bpf_dynptr_clone(struct bpf_dynptr_kern *ptr,
> > > ^~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2432:19: warning: no previous declaration for 'bpf_cast_to_kern_ctx' [-Wmissing-declarations]
> > > __bpf_kfunc void *bpf_cast_to_kern_ctx(void *obj)
> > > ^~~~~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2437:19: warning: no previous declaration for 'bpf_rdonly_cast' [-Wmissing-declarations]
> > > __bpf_kfunc void *bpf_rdonly_cast(void *obj__ign, u32 btf_id__k)
> > > ^~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2442:18: warning: no previous declaration for 'bpf_rcu_read_lock' [-Wmissing-declarations]
> > > __bpf_kfunc void bpf_rcu_read_lock(void)
> > > ^~~~~~~~~~~~~~~~~
> > > kernel/bpf/helpers.c:2447:18: warning: no previous declaration for 'bpf_rcu_read_unlock' [-Wmissing-declarations]
> > > __bpf_kfunc void bpf_rcu_read_unlock(void)
> > > ^~~~~~~~~~~~~~~~~~~
> > >
> > >
> > > vim +/bpf_percpu_obj_new_impl +1905 kernel/bpf/helpers.c
> > >
> > > 1904
> > > > 1905 __bpf_kfunc void *bpf_percpu_obj_new_impl(u64 local_type_id__k, void *meta__ign)
> > > 1906 {
> > > 1907 u64 size = local_type_id__k;
> > > 1908
> > > 1909 /* The verifier has ensured that meta__ign must be NULL */
> > > 1910 return bpf_mem_alloc(&bpf_global_percpu_ma, size);
> > > 1911 }
> > > 1912
> > > 1913 /* Must be called under migrate_disable(), as required by bpf_mem_free */
> > > 1914 void __bpf_obj_drop_impl(void *p, const struct btf_record *rec)
> > > 1915 {
> > > 1916 if (rec && rec->refcount_off >= 0 &&
> > > 1917 !refcount_dec_and_test((refcount_t *)(p + rec->refcount_off))) {
> > > 1918 /* Object is refcounted and refcount_dec didn't result in 0
> > > 1919 * refcount. Return without freeing the object
> > > 1920 */
> > > 1921 return;
> > > 1922 }
> > > 1923
> > > 1924 if (rec)
> > > 1925 bpf_obj_free_fields(rec, p);
> > > 1926
> > > 1927 if (rec && rec->refcount_off >= 0)
> > > 1928 bpf_mem_free_rcu(&bpf_global_ma, p);
> > > 1929 else
> > > 1930 bpf_mem_free(&bpf_global_ma, p);
> > > 1931 }
> > > 1932
> > > 1933 __bpf_kfunc void bpf_obj_drop_impl(void *p__alloc, void *meta__ign)
> > > 1934 {
> > > 1935 struct btf_struct_meta *meta = meta__ign;
> > > 1936 void *p = p__alloc;
> > > 1937
> > > 1938 __bpf_obj_drop_impl(p, meta ? meta->record : NULL);
> > > 1939 }
> > > 1940
> > > > 1941 __bpf_kfunc void bpf_percpu_obj_drop_impl(void *p__alloc, void *meta__ign)
> > > 1942 {
> > > 1943 /* The verifier has ensured that meta__ign must be NULL */
> > > 1944 bpf_mem_free_rcu(&bpf_global_percpu_ma, p__alloc);
> > > 1945 }
> > > 1946
> > >
> > > --
> > > 0-DAY CI Kernel Test Service
> > > https://github.com/intel/lkp-tests/wiki
> > >
>

Next message: Paul Durrant: "[PATCH v5] KVM x86/xen: add an override for PVCLOCK_TSC_STABLE_BIT"
Previous message: Sebastian Andrzej Siewior: "Re: [PATCH] sched/fair: Make the BW replenish timer expire in hardirq context for PREEMPT_RT"
In reply to: Yonghong Song: "Re: kernel/bpf/helpers.c:1905:19: warning: no previous declaration for 'bpf_percpu_obj_new_impl'"
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