netdev - [PATCH bpf-next 2/5] riscv, bpf: Relax restrictions on Zbb instructions

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Date: Thu, 28 Mar 2024 12:49:13 +0000
From: Pu Lehui <pulehui@...weicloud.com>
To: bpf@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	netdev@...r.kernel.org
Cc: Björn Töpel <bjorn@...nel.org>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	Andrii Nakryiko <andrii@...nel.org>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	Eduard Zingerman <eddyz87@...il.com>,
	Song Liu <song@...nel.org>,
	Yonghong Song <yhs@...com>,
	John Fastabend <john.fastabend@...il.com>,
	KP Singh <kpsingh@...nel.org>,
	Stanislav Fomichev <sdf@...gle.com>,
	Hao Luo <haoluo@...gle.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Mykola Lysenko <mykolal@...com>,
	Manu Bretelle <chantr4@...il.com>,
	Pu Lehui <pulehui@...wei.com>,
	Pu Lehui <pulehui@...weicloud.com>
Subject: [PATCH bpf-next 2/5] riscv, bpf: Relax restrictions on Zbb instructions

From: Pu Lehui <pulehui@...wei.com>

This patch relaxes the restrictions on the Zbb instructions. The hardware
is capable of recognizing the Zbb instructions independently, eliminating
the need for reliance on kernel compile configurations.

Signed-off-by: Pu Lehui <pulehui@...wei.com>
---
 arch/riscv/net/bpf_jit.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/net/bpf_jit.h b/arch/riscv/net/bpf_jit.h
index 5fc374ed98ea..bcf109b88df5 100644
--- a/arch/riscv/net/bpf_jit.h
+++ b/arch/riscv/net/bpf_jit.h
@@ -20,7 +20,7 @@ static inline bool rvc_enabled(void)
 
 static inline bool rvzbb_enabled(void)
 {
-	return IS_ENABLED(CONFIG_RISCV_ISA_ZBB) && riscv_has_extension_likely(RISCV_ISA_EXT_ZBB);
+	return riscv_has_extension_likely(RISCV_ISA_EXT_ZBB);
 }
 
 enum {
-- 
2.34.1