Daniel Borkmann 8968c67a82 bpf, arm64: remove prefetch insn in xadd mapping ... Prefetch-with-intent-to-write is currently part of the XADD mapping in the AArch64 JIT and follows the kernel's implementation of atomic_add. This may interfere with other threads executing the LDXR/STXR loop, leading to potential starvation and fairness issues. Drop the optional prefetch instruction. Fixes: 85f68fe898 ("bpf, arm64: implement jiting of BPF_XADD") Reported-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2019-04-26 18:53:15 -07:00
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bpf_jit.h	bpf, arm64: remove prefetch insn in xadd mapping	2019-04-26 18:53:15 -07:00
bpf_jit_comp.c	bpf, arm64: remove prefetch insn in xadd mapping	2019-04-26 18:53:15 -07:00
Makefile