From: Pu Lehui <pulehui@huawei.com>
Date: Tue, 30 Jan 2024 12:46:58 +0000 (+0000)
Subject: riscv, bpf: Enable inline bpf_kptr_xchg() for RV64
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=69065aa11ca680d76a6c6bc088aa0f0abe24afdb;p=linux.git

riscv, bpf: Enable inline bpf_kptr_xchg() for RV64

RV64 JIT supports 64-bit BPF_XCHG atomic instructions. At the same time,
the underlying implementation of xchg() and atomic64_xchg() in RV64 both
are raw_xchg() that supported 64-bit. Therefore inline bpf_kptr_xchg()
will have equivalent semantics. Let's inline it for better performance.

Signed-off-by: Pu Lehui <pulehui@huawei.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Björn Töpel <bjorn@kernel.org>
Link: https://lore.kernel.org/bpf/20240130124659.670321-2-pulehui@huaweicloud.com
---

diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index fda6b4f6a4c12..869e4282a2c42 100644
--- a/arch/riscv/net/bpf_jit_comp64.c
+++ b/arch/riscv/net/bpf_jit_comp64.c
@@ -1806,3 +1806,8 @@ bool bpf_jit_supports_kfunc_call(void)
 {
 	return true;
 }
+
+bool bpf_jit_supports_ptr_xchg(void)
+{
+	return true;
+}