[bpf-next,1/2] riscv, bpf: Enable inline bpf_kptr_xchg() for RV64

Commit Message

Pu Lehui Jan. 30, 2024, 12:46 p.m. UTC

From: Pu Lehui <[e-mail]>

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 <[e-mail]>
---
 arch/riscv/net/bpf_jit_comp64.c | 5 +++++
 1 file changed, 5 insertions(+)

Patch

diff --git a/arch/riscv/net/bpf_jit_comp64.c b/arch/riscv/net/bpf_jit_comp64.c
index fda6b4f6a4c1..869e4282a2c4 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;
+}