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| author | Daniel Borkmann <daniel@iogearbox.net> | 2019-04-26 21:48:21 +0200 |
|---|---|---|
| committer | Bruno Martins <bgcngm@gmail.com> | 2024-01-10 14:16:43 +0000 |
| commit | 5a18785449b692228589667baf6dc290d640dae8 (patch) | |
| tree | a5b654e48104870b6c12a8f5e7837737c7a019a7 /lib/string_helpers.c | |
| parent | c76a2e79e92a82bed040e0277b395978ab732b14 (diff) | |
bpf, arm64: remove prefetch insn in xadd mapping
commit 8968c67a82ab7501bc3b9439c3624a49b42fe54c upstream.
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: 85f68fe89832 ("bpf, arm64: implement jiting of BPF_XADD")
Reported-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Change-Id: I3c0f7d2357d668a223991c47402f5004bad70edb
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Diab Neiroukh <lazerl0rd@thezest.dev>
Diffstat (limited to 'lib/string_helpers.c')
0 files changed, 0 insertions, 0 deletions