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authorStefan Agner <stefan@agner.ch>2018-08-27 21:30:42 +0200
committerAlexei Starovoitov <ast@kernel.org>2018-08-27 20:37:05 -0700
commit3f6e138d41ddff196f452993528cfe75762ede0f (patch)
tree88865bff5748dab42ec22cbab9756418abcfc647 /net/core
parent15c480efab01197c965ce0562a43ffedd852b8f9 (diff)
downloadlinux-3f6e138d41ddff196f452993528cfe75762ede0f.tar.bz2
bpf: fix build error with clang
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> Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'net/core')
-rw-r--r--net/core/filter.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/core/filter.c b/net/core/filter.c
index c25eb36f1320..7a2430945c71 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -7281,7 +7281,7 @@ static u32 sk_reuseport_convert_ctx_access(enum bpf_access_type type,
break;
case offsetof(struct sk_reuseport_md, ip_protocol):
- BUILD_BUG_ON(hweight_long(SK_FL_PROTO_MASK) != BITS_PER_BYTE);
+ BUILD_BUG_ON(HWEIGHT32(SK_FL_PROTO_MASK) != BITS_PER_BYTE);
SK_REUSEPORT_LOAD_SK_FIELD_SIZE_OFF(__sk_flags_offset,
BPF_W, 0);
*insn++ = BPF_ALU32_IMM(BPF_AND, si->dst_reg, SK_FL_PROTO_MASK);