Re: [PATCH] bpf: fix build error with clang

From: Alexei Starovoitov
Date: Mon Aug 27 2018 - 23:44:49 EST

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@xxxxxxxx>

Applied, Thanks