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bpf, x86: Remove unnecessary handling of BPF_SUB atomic op

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According to the LLVM commit (https://reviews.llvm.org/D72184),
sync_fetch_and_sub() is implemented as a negation followed by
sync_fetch_and_add(), so there will be no BPF_SUB op, thus just
remove it. BPF_SUB is also rejected by the verifier anyway.

Signed-off-by: Hou Tao <houtao1@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Brendan Jackman <jackmanb@google.com>
Link: https://lore.kernel.org/bpf/20220127083240.1425481-1-houtao1@huawei.com
This commit is contained in:
Hou Tao 2022-01-27 16:32:40 +08:00 committed by Daniel Borkmann
parent 50fc9786b2
commit b6ec79518e
1 changed files with 0 additions and 1 deletions
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arch/x86/net/bpf_jit_comp.c
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@ -787,7 +787,6 @@ static int emit_atomic(u8 **pprog, u8 atomic_op,
/* emit opcode */
switch (atomic_op) {
case BPF_ADD:
case BPF_SUB:
case BPF_AND:
case BPF_OR:
case BPF_XOR: