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Message-ID: <202308180156.XOZHWYw5-lkp@intel.com>
Date: Fri, 18 Aug 2023 01:43:12 +0800
From: kernel test robot <lkp@...el.com>
To: Yonghong Song <yhs@...com>
Cc: oe-kbuild-all@...ts.linux.dev, linux-kernel@...r.kernel.org,
Alexei Starovoitov <ast@...nel.org>
Subject: kernel/bpf/helpers.c:1993:6: warning: no previous declaration for
'bpf_rcu_read_lock'
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 16931859a6500d360b90aeacab3b505a3560a3ed
commit: 9bb00b2895cbfe0ad410457b605d0a72524168c1 bpf: Add kfunc bpf_rcu_read_lock/unlock()
date: 9 months ago
config: x86_64-randconfig-x012-20230816 (https://download.01.org/0day-ci/archive/20230818/202308180156.XOZHWYw5-lkp@intel.com/config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce: (https://download.01.org/0day-ci/archive/20230818/202308180156.XOZHWYw5-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@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308180156.XOZHWYw5-lkp@intel.com/
All warnings (new ones prefixed by >>):
kernel/bpf/helpers.c:1760:7: warning: no previous declaration for 'bpf_obj_new_impl' [-Wmissing-declarations]
void *bpf_obj_new_impl(u64 local_type_id__k, void *meta__ign)
^~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1774:6: warning: no previous declaration for 'bpf_obj_drop_impl' [-Wmissing-declarations]
void bpf_obj_drop_impl(void *p__alloc, void *meta__ign)
^~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1795:6: warning: no previous declaration for 'bpf_list_push_front' [-Wmissing-declarations]
void bpf_list_push_front(struct bpf_list_head *head, struct bpf_list_node *node)
^~~~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1800:6: warning: no previous declaration for 'bpf_list_push_back' [-Wmissing-declarations]
void bpf_list_push_back(struct bpf_list_head *head, struct bpf_list_node *node)
^~~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1818:23: warning: no previous declaration for 'bpf_list_pop_front' [-Wmissing-declarations]
struct bpf_list_node *bpf_list_pop_front(struct bpf_list_head *head)
^~~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1823:23: warning: no previous declaration for 'bpf_list_pop_back' [-Wmissing-declarations]
struct bpf_list_node *bpf_list_pop_back(struct bpf_list_head *head)
^~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1834:21: warning: no previous declaration for 'bpf_task_acquire' [-Wmissing-declarations]
struct task_struct *bpf_task_acquire(struct task_struct *p)
^~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1846:21: warning: no previous declaration for 'bpf_task_kptr_get' [-Wmissing-declarations]
struct task_struct *bpf_task_kptr_get(struct task_struct **pp)
^~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1877:6: warning: no previous declaration for 'bpf_task_release' [-Wmissing-declarations]
void bpf_task_release(struct task_struct *p)
^~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1892:16: warning: no previous declaration for 'bpf_cgroup_acquire' [-Wmissing-declarations]
struct cgroup *bpf_cgroup_acquire(struct cgroup *cgrp)
^~~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1904:16: warning: no previous declaration for 'bpf_cgroup_kptr_get' [-Wmissing-declarations]
struct cgroup *bpf_cgroup_kptr_get(struct cgroup **cgrpp)
^~~~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1936:6: warning: no previous declaration for 'bpf_cgroup_release' [-Wmissing-declarations]
void bpf_cgroup_release(struct cgroup *cgrp)
^~~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1951:16: warning: no previous declaration for 'bpf_cgroup_ancestor' [-Wmissing-declarations]
struct cgroup *bpf_cgroup_ancestor(struct cgroup *cgrp, int level)
^~~~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1970:21: warning: no previous declaration for 'bpf_task_from_pid' [-Wmissing-declarations]
struct task_struct *bpf_task_from_pid(s32 pid)
^~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1983:7: warning: no previous declaration for 'bpf_cast_to_kern_ctx' [-Wmissing-declarations]
void *bpf_cast_to_kern_ctx(void *obj)
^~~~~~~~~~~~~~~~~~~~
kernel/bpf/helpers.c:1988:7: warning: no previous declaration for 'bpf_rdonly_cast' [-Wmissing-declarations]
void *bpf_rdonly_cast(void *obj__ign, u32 btf_id__k)
^~~~~~~~~~~~~~~
>> kernel/bpf/helpers.c:1993:6: warning: no previous declaration for 'bpf_rcu_read_lock' [-Wmissing-declarations]
void bpf_rcu_read_lock(void)
^~~~~~~~~~~~~~~~~
>> kernel/bpf/helpers.c:1998:6: warning: no previous declaration for 'bpf_rcu_read_unlock' [-Wmissing-declarations]
void bpf_rcu_read_unlock(void)
^~~~~~~~~~~~~~~~~~~
vim +/bpf_rcu_read_lock +1993 kernel/bpf/helpers.c
1963
1964 /**
1965 * bpf_task_from_pid - Find a struct task_struct from its pid by looking it up
1966 * in the root pid namespace idr. If a task is returned, it must either be
1967 * stored in a map, or released with bpf_task_release().
1968 * @pid: The pid of the task being looked up.
1969 */
> 1970 struct task_struct *bpf_task_from_pid(s32 pid)
1971 {
1972 struct task_struct *p;
1973
1974 rcu_read_lock();
1975 p = find_task_by_pid_ns(pid, &init_pid_ns);
1976 if (p)
1977 bpf_task_acquire(p);
1978 rcu_read_unlock();
1979
1980 return p;
1981 }
1982
> 1983 void *bpf_cast_to_kern_ctx(void *obj)
1984 {
1985 return obj;
1986 }
1987
1988 void *bpf_rdonly_cast(void *obj__ign, u32 btf_id__k)
1989 {
1990 return obj__ign;
1991 }
1992
> 1993 void bpf_rcu_read_lock(void)
1994 {
1995 rcu_read_lock();
1996 }
1997
> 1998 void bpf_rcu_read_unlock(void)
1999 {
2000 rcu_read_unlock();
2001 }
2002
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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