linux-kernel - [PATCH 2/2] net: smc: SMC_HS_CTRL_BPF should depend on BPF

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Message-ID: <988c61e5fea280872d81b3640f1f34d0619cfbbf.1764843951.git.geert@linux-m68k.org>
Date: Thu,  4 Dec 2025 11:29:16 +0100
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Kui-Feng Lee <thinker.li@...il.com>,
	Martin KaFai Lau <martin.lau@...ux.dev>,
	"D . Wythe" <alibuda@...ux.alibaba.com>,
	Dust Li <dust.li@...ux.alibaba.com>,
	Alexei Starovoitov <ast@...nel.org>,
	Daniel Borkmann <daniel@...earbox.net>,
	John Fastabend <john.fastabend@...il.com>,
	Sidraya Jayagond <sidraya@...ux.ibm.com>,
	Wenjia Zhang <wenjia@...ux.ibm.com>,
	Mahanta Jambigi <mjambigi@...ux.ibm.com>,
	Tony Lu <tonylu@...ux.alibaba.com>,
	Wen Gu <guwen@...ux.alibaba.com>,
	"David S . Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Simon Horman <horms@...nel.org>
Cc: bpf@...r.kernel.org,
	linux-rdma@...r.kernel.org,
	linux-s390@...r.kernel.org,
	netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: [PATCH 2/2] net: smc: SMC_HS_CTRL_BPF should depend on BPF_JIT

If CONFIG_BPF_SYSCALL=y, but CONFIG_BPF_JIT=n:

    net/smc/smc_hs_bpf.c: In function ‘bpf_smc_hs_ctrl_init’:
    include/linux/bpf.h:2068:50: error: statement with no effect [-Werror=unused-value]
     2068 | #define register_bpf_struct_ops(st_ops, type) ({ (void *)(st_ops); 0; })
	  |                                                  ^~~~~~~~~~~~~~~~
    net/smc/smc_hs_bpf.c:139:16: note: in expansion of macro ‘register_bpf_struct_ops’
      139 |         return register_bpf_struct_ops(&bpf_smc_hs_ctrl_ops, smc_hs_ctrl);
	  |                ^~~~~~~~~~~~~~~~~~~~~~~

While this compile error is caused by a bug in <linux/bpf.h>, none of
the code in net/smc/smc_hs_bpf.c becomes effective if CONFIG_BPF_JIT is
not enabled.  Hence add a dependency on BPF_JIT.

While at it, add the missing newline at the end of the file.

Fixes: 15f295f55656658e ("net/smc: bpf: Introduce generic hook for handshake flow")
Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
---
 net/smc/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/net/smc/Kconfig b/net/smc/Kconfig
index 325addf83cc69f6c..277ef504bc26ef89 100644
--- a/net/smc/Kconfig
+++ b/net/smc/Kconfig
@@ -22,10 +22,10 @@ config SMC_DIAG
 
 config SMC_HS_CTRL_BPF
 	bool "Generic eBPF hook for SMC handshake flow"
-	depends on SMC && BPF_SYSCALL
+	depends on SMC && BPF_JIT && BPF_SYSCALL
 	default y
 	help
 	  SMC_HS_CTRL_BPF enables support to register generic eBPF hook for SMC
 	  handshake flow, which offer much greater flexibility in modifying the behavior
 	  of the SMC protocol stack compared to a complete kernel-based approach. Select
-	  this option if you want filtring the handshake process via eBPF programs.
\ No newline at end of file
+	  this option if you want filtring the handshake process via eBPF programs.
-- 
2.43.0