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    Subject[PATCH 5.15 036/171] bpf, x86: Fix "no previous prototype" warning
    Date
    From: Björn Töpel <bjorn@kernel.org>

    commit f45b2974cc0ae959a4c503a071e38a56bd64372f upstream.

    The arch_prepare_bpf_dispatcher function does not have a prototype, and
    yields the following warning when W=1 is enabled for the kernel build.

    >> arch/x86/net/bpf_jit_comp.c:2188:5: warning: no previous \
    prototype for 'arch_prepare_bpf_dispatcher' [-Wmissing-prototypes]
    2188 | int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, \
    int num_funcs)
    | ^~~~~~~~~~~~~~~~~~~~~~~~~~~

    Remove the warning by adding a function declaration to include/linux/bpf.h.

    Fixes: 75ccbef6369e ("bpf: Introduce BPF dispatcher")
    Reported-by: kernel test robot <lkp@intel.com>
    Signed-off-by: Björn Töpel <bjorn@kernel.org>
    Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
    Link: https://lore.kernel.org/bpf/20211117125708.769168-1-bjorn@kernel.org
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    include/linux/bpf.h | 1 +
    1 file changed, 1 insertion(+)

    --- a/include/linux/bpf.h
    +++ b/include/linux/bpf.h
    @@ -723,6 +723,7 @@ int bpf_trampoline_unlink_prog(struct bp
    struct bpf_trampoline *bpf_trampoline_get(u64 key,
    struct bpf_attach_target_info *tgt_info);
    void bpf_trampoline_put(struct bpf_trampoline *tr);
    +int arch_prepare_bpf_dispatcher(void *image, s64 *funcs, int num_funcs);
    #define BPF_DISPATCHER_INIT(_name) { \
    .mutex = __MUTEX_INITIALIZER(_name.mutex), \
    .func = &_name##_func, \

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