[PATCH v4 2/4] LoongArch: bpf: Advertise JIT support for kptr xchg inline

[Chenguang Zhao <chenguang.zhao@linux.dev>]

From: Chenguang Zhao <zhaochenguang@kylinos.cn>

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.

Signed-off-by: Chenguang Zhao <zhaochenguang@kylinos.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 5417a5624327..686d333146ce 100644
--- a/arch/loongarch/net/bpf_jit.c
+++ b/arch/loongarch/net/bpf_jit.c
@@ -2396,6 +2396,11 @@ 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)
 {
-- 
2.25.1