From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Subject: Re: [PATCH] bpf: fix build error with clang
Date: Mon, 27 Aug 2018 20:44:44 -0700
Message-ID: <20180828034442.drkvs6erk4dh65eu@ast-mbp>
References: <20180827193042.3573-1-stefan@agner.ch>
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Cc: daniel@iogearbox.net, kafai@fb.com, ast@kernel.org,
        mka@chromium.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
To: Stefan Agner <stefan@agner.ch>
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In-Reply-To: <20180827193042.3573-1-stefan@agner.ch>
Sender: linux-kernel-owner@vger.kernel.org
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On Mon, Aug 27, 2018 at 09:30:42PM +0200, Stefan Agner wrote:
> Building the newly introduced BPF_PROG_TYPE_SK_REUSEPORT leads to
> a compile time error when building with clang:
> net/core/filter.o: In function `sk_reuseport_convert_ctx_access':
>   ../net/core/filter.c:7284: undefined reference to `__compiletime_assert_7284'
> 
> It seems that clang has issues resolving hweight_long at compile
> time. Since SK_FL_PROTO_MASK is a constant, we can use the interface
> for known constant arguments which works fine with clang.
> 
> Fixes: 2dbb9b9e6df6 ("bpf: Introduce BPF_PROG_TYPE_SK_REUSEPORT")
> Signed-off-by: Stefan Agner <stefan@agner.ch>

Applied, Thanks