From: Alexander Lobakin <alobakin@dlink.ru>
To: "David S. Miller" <davem@davemloft.net>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
Yonghong Song <yhs@fb.com>, Andrii Nakryiko <andriin@fb.com>,
Eric Dumazet <edumazet@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
Soheil Hassas Yeganeh <soheil@google.com>,
Aaron Tomlin <atomlin@redhat.com>,
Matteo Croce <mcroce@redhat.com>,
Alexander Lobakin <alobakin@dlink.ru>,
Cong Wang <xiyou.wangcong@gmail.com>,
Edward Cree <ecree@solarflare.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
bpf@vger.kernel.org
Subject: [PATCH net] net: core: sysctl: fix compiler warning when only cBPF is present
Date: Wed, 18 Dec 2019 12:18:21 +0300 [thread overview]
Message-ID: <20191218091821.7080-1-alobakin@dlink.ru> (raw)
proc_dointvec_minmax_bpf_restricted() has been firstly introduced
in commit 2e4a30983b0f ("bpf: restrict access to core bpf sysctls")
under CONFIG_HAVE_EBPF_JIT. Then, this ifdef has been removed in
ede95a63b5e8 ("bpf: add bpf_jit_limit knob to restrict unpriv
allocations"), because a new sysctl, bpf_jit_limit, made use of it.
Finally, this parameter has become long instead of integer with
fdadd04931c2 ("bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K")
and thus, a new proc_dolongvec_minmax_bpf_restricted() has been
added.
With this last change, we got back to that
proc_dointvec_minmax_bpf_restricted() is used only under
CONFIG_HAVE_EBPF_JIT, but the corresponding ifdef has not been
brought back.
So, in configurations like CONFIG_BPF_JIT=y && CONFIG_HAVE_EBPF_JIT=n
since v4.20 we have:
CC net/core/sysctl_net_core.o
net/core/sysctl_net_core.c:292:1: warning: ‘proc_dointvec_minmax_bpf_restricted’ defined but not used [-Wunused-function]
292 | proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Suppress this by guarding it with CONFIG_HAVE_EBPF_JIT again.
Fixes: fdadd04931c2 ("bpf: fix bpf_jit_limit knob for PAGE_SIZE >= 64K")
Signed-off-by: Alexander Lobakin <alobakin@dlink.ru>
---
net/core/sysctl_net_core.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/net/core/sysctl_net_core.c b/net/core/sysctl_net_core.c
index eb29e5adc84d..70211c9edb02 100644
--- a/net/core/sysctl_net_core.c
+++ b/net/core/sysctl_net_core.c
@@ -288,6 +288,7 @@ static int proc_dointvec_minmax_bpf_enable(struct ctl_table *table, int write,
return ret;
}
+#ifdef CONFIG_HAVE_EBPF_JIT
static int
proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp,
@@ -298,6 +299,7 @@ proc_dointvec_minmax_bpf_restricted(struct ctl_table *table, int write,
return proc_dointvec_minmax(table, write, buffer, lenp, ppos);
}
+#endif /* CONFIG_HAVE_EBPF_JIT */
static int
proc_dolongvec_minmax_bpf_restricted(struct ctl_table *table, int write,
--
2.24.1
next reply other threads:[~2019-12-18 9:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-18 9:18 Alexander Lobakin [this message]
2019-12-19 16:20 ` [PATCH net] net: core: sysctl: fix compiler warning when only cBPF is present Daniel Borkmann
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