[PATCH bpf] bpf, x86: Fix "no previous prototype" warning

[PATCH bpf] bpf, x86: Fix "no previous prototype" warning

[Björn Töpel]

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>
---
 include/linux/bpf.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index e7a163a3146b..84ff6ef49462 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -732,6 +732,7 @@ int bpf_trampoline_unlink_prog(struct bpf_prog *prog, struct bpf_trampoline *tr)
 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,					\

base-commit: 3751c3d34cd5a750c86d1c8eaf217d8faf7f9325
-- 
2.32.0

Re: [PATCH bpf] bpf, x86: Fix "no previous prototype" warning

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf.git (master)
by Daniel Borkmann <daniel@iogearbox.net>:

On Wed, 17 Nov 2021 13:57:08 +0100 you wrote:
> 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)
>              |     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> [...]

Here is the summary with links:
  - [bpf] bpf, x86: Fix "no previous prototype" warning
    https://git.kernel.org/bpf/bpf/c/f45b2974cc0a

You are awesome, thank you!
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