netdev - [PATCH 01/18] bpf: Export bpf_link

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Message-ID: <20220328175033.2437312-2-roberto.sassu@huawei.com>
Date:   Mon, 28 Mar 2022 19:50:16 +0200
From:   Roberto Sassu <roberto.sassu@...wei.com>
To:     <corbet@....net>, <viro@...iv.linux.org.uk>, <ast@...nel.org>,
        <daniel@...earbox.net>, <andrii@...nel.org>, <kpsingh@...nel.org>,
        <shuah@...nel.org>, <mcoquelin.stm32@...il.com>,
        <alexandre.torgue@...s.st.com>, <zohar@...ux.ibm.com>
CC:     <linux-doc@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        <linux-kselftest@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-integrity@...r.kernel.org>,
        <linux-security-module@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        Roberto Sassu <roberto.sassu@...wei.com>
Subject: [PATCH 01/18] bpf: Export bpf_link_inc()

In the upcoming patches, populate_bpffs() will not have visibility anymore
on the links and maps to be pinned (to avoid the limitation of the 'objs'
fixed-size array), but the eBPF-program-specific preload method will
directly do the pinning and increase/decrease the reference count.

Since the preload method can be implemented in a kernel module, also
bpf_link_inc(), before called by populate_bpffs(), should be exported.
Thus, export bpf_link_inc().

Signed-off-by: Roberto Sassu <roberto.sassu@...wei.com>
---
 kernel/bpf/syscall.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index cdaa1152436a..8ffe342545c3 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -2459,6 +2459,7 @@ void bpf_link_inc(struct bpf_link *link)
 {
 	atomic64_inc(&link->refcnt);
 }
+EXPORT_SYMBOL_GPL(bpf_link_inc);
 
 /* bpf_link_free is guaranteed to be called from process context */
 static void bpf_link_free(struct bpf_link *link)
-- 
2.32.0