From: Hou Tao <houtao1@xxxxxxxxxx>
ARM64 bpf jit satisfies the following two conditions:
1) support BPF_XCHG() on pointer-sized word.
2) the implementation of xchg is the same as atomic_xchg() on
pointer-sized words. Both of these two functions use arch_xchg() to
implement the exchange.
So enable the inline of bpf_kptr_xchg() for arm64 bpf jit.
Signed-off-by: Hou Tao <houtao1@xxxxxxxxxx>
---
arch/arm64/net/bpf_jit_comp.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/arm64/net/bpf_jit_comp.c b/arch/arm64/net/bpf_jit_comp.c
index 8955da5c47cf7..cfd5434de4832 100644
--- a/arch/arm64/net/bpf_jit_comp.c
+++ b/arch/arm64/net/bpf_jit_comp.c
@@ -2305,3 +2305,8 @@ int bpf_arch_text_poke(void *ip, enum bpf_text_poke_type poke_type,
return ret;
}
+
+bool bpf_jit_supports_ptr_xchg(void)
+{
+ return true;
+}
--
2.29.2
