linux-kernel - [PATCH 5.15 036/171] bpf, x86: Fix "no previous prototype" warning

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Message-Id: <20211213092946.282091371@linuxfoundation.org>
Date:   Mon, 13 Dec 2021 10:29:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, kernel test robot <lkp@...el.com>,
        Björn Töpel <bjorn@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [PATCH 5.15 036/171] bpf, x86: Fix "no previous prototype" warning

From: Björn Töpel <bjorn@...nel.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@...el.com>
Signed-off-by: Björn Töpel <bjorn@...nel.org>
Signed-off-by: Daniel Borkmann <daniel@...earbox.net>
Link: https://lore.kernel.org/bpf/20211117125708.769168-1-bjorn@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.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,					\