linux-kernel - [PATCH 5.11 044/775] bpf: Avoid warning when re-casting __bpf_call_base into __bpf_call_base

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Date:   Mon,  1 Mar 2021 17:03:32 +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>,
        Andrii Nakryiko <andrii@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Yonghong Song <yhs@...com>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.11 044/775] bpf: Avoid warning when re-casting __bpf_call_base into __bpf_call_base_args

From: Andrii Nakryiko <andrii@...nel.org>

[ Upstream commit 6943c2b05bf09fd5c5729f7d7d803bf3f126cb9a ]

BPF interpreter uses extra input argument, so re-casts __bpf_call_base into
__bpf_call_base_args. Avoid compiler warning about incompatible function
prototypes by casting to void * first.

Fixes: 1ea47e01ad6e ("bpf: add support for bpf_call to interpreter")
Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Andrii Nakryiko <andrii@...nel.org>
Signed-off-by: Alexei Starovoitov <ast@...nel.org>
Acked-by: Yonghong Song <yhs@...com>
Link: https://lore.kernel.org/bpf/20210112075520.4103414-3-andrii@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 include/linux/filter.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/filter.h b/include/linux/filter.h
index 29c27656165b2..5edf2b6608812 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -886,7 +886,7 @@ void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);
 u64 __bpf_call_base(u64 r1, u64 r2, u64 r3, u64 r4, u64 r5);
 #define __bpf_call_base_args \
 	((u64 (*)(u64, u64, u64, u64, u64, const struct bpf_insn *)) \
-	 __bpf_call_base)
+	 (void *)__bpf_call_base)
 
 struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog);
 void bpf_jit_compile(struct bpf_prog *prog);
-- 
2.27.0