From 1fec6bbc09e3066a0f39d85741df2a7877c97945 Mon Sep 17 00:00:00 2001
From: Chenguang Zhao <zhaochenguang@kylinos.cn>
Date: Mon, 17 Aug 2026 22:07:39 +0800
Subject: [PATCH] LoongArch: BPF: Advertise JIT support for kptr xchg inline

The BPF verifier can lower bpf_kptr_xchg() to BPF_XCHG when the JIT
advertises ptr xchg support. With ordered amswap_db.* emission from the
previous patch, declare that LoongArch bpf JIT supports this inlining.

Acked-by: Hengqi Chen <hengqi.chen@gmail.com>
Acked-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Tested-by: Tiezhu Yang <yangtiezhu@loongson.cn>
Signed-off-by: Chenguang Zhao <zhaochenguang@kylinos.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
---
 arch/loongarch/net/bpf_jit.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/loongarch/net/bpf_jit.c b/arch/loongarch/net/bpf_jit.c
index e11f9c9dbe1a..d2ce187d1e23 100644
--- a/arch/loongarch/net/bpf_jit.c
+++ b/arch/loongarch/net/bpf_jit.c
@@ -2371,6 +2371,11 @@ bool bpf_jit_supports_fsession(void)
 	return true;
 }
 
+bool bpf_jit_supports_ptr_xchg(void)
+{
+	return true;
+}
+
 /* Indicate the JIT backend supports mixing bpf2bpf and tailcalls. */
 bool bpf_jit_supports_subprog_tailcalls(void)
 {