5ca419f2864a2c60940dcf4bbaeb69546200e36f - linux

commit	5ca419f2864a2c60940dcf4bbaeb69546200e36f	[log] [tgz]
author	Brendan Jackman <jackmanb@google.com>	Thu Jan 14 18:17:46 2021 +0000
committer	Alexei Starovoitov <ast@kernel.org>	Thu Jan 14 18:34:29 2021 -0800
tree	edd181e67503cb404dfa55cfaae6d757db3e22b6
parent	c5bcb5eb4db632280b4123135d583a7bc8caea3e [diff]

bpf: Add BPF_FETCH field / create atomic_fetch_add instruction

The BPF_FETCH field can be set in bpf_insn.imm, for BPF_ATOMIC
instructions, in order to have the previous value of the
atomically-modified memory location loaded into the src register
after an atomic op is carried out.

Suggested-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Brendan Jackman <jackmanb@google.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: John Fastabend <john.fastabend@gmail.com>
Link: https://lore.kernel.org/bpf/20210114181751.768687-7-jackmanb@google.com

arch/x86/net/bpf_jit_comp.c[diff]
include/linux/filter.h[diff]
include/uapi/linux/bpf.h[diff]
kernel/bpf/core.c[diff]
kernel/bpf/disasm.c[diff]
kernel/bpf/verifier.c[diff]
tools/include/linux/filter.h[diff]
tools/include/uapi/linux/bpf.h[diff]

8 files changed

tree: edd181e67503cb404dfa55cfaae6d757db3e22b6