From: Chenguang Zhao <chenguang.zhao@linux.dev>
To: chenhuacai@kernel.org, kernel@xen0n.name, ast@kernel.org,
daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev,
eddyz87@gmail.com, memxor@gmail.com, yangtiezhu@loongson.cn
Cc: hengqi.chen@gmail.com, song@kernel.org, yonghong.song@linux.dev,
jolsa@kernel.org, shuah@kernel.org, loongarch@lists.linux.dev,
bpf@vger.kernel.org, linux-kselftest@vger.kernel.org,
chenguang.zhao@linux.dev,
Chenguang Zhao <zhaochenguang@kylinos.cn>
Subject: [PATCH v4 2/4] LoongArch: bpf: Advertise JIT support for kptr xchg inline
Date: Wed, 29 Jul 2026 10:28:35 +0800 [thread overview]
Message-ID: <20260729022837.355549-3-chenguang.zhao@linux.dev> (raw)
In-Reply-To: <20260729022837.355549-1-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
next prev parent reply other threads:[~2026-07-29 2:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-29 2:28 [PATCH v4 0/4] LoongArch bpf kptr xchg inline support Chenguang Zhao
2026-07-29 2:28 ` [PATCH v4 1/4] LoongArch: bpf: Fix memory ordering for value-returning atomics Chenguang Zhao
2026-07-29 2:28 ` Chenguang Zhao [this message]
2026-07-29 2:28 ` [PATCH v4 3/4] selftests/bpf: Enable kptr_xchg_inline test on LoongArch Chenguang Zhao
2026-07-29 2:28 ` [PATCH v4 4/4] selftests/bpf: Add kptr-xchg benchmark Chenguang Zhao
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