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From: Jiri Olsa <jolsa@kernel.org>
To: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>
Cc: "Song Liu" <songliubraving@fb.com>,
	netdev@vger.kernel.org, bpf@vger.kernel.org,
	"Andrii Nakryiko" <andriin@fb.com>, "Yonghong Song" <yhs@fb.com>,
	"Martin KaFai Lau" <kafai@fb.com>,
	"Jakub Kicinski" <kuba@kernel.org>,
	"David Miller" <davem@redhat.com>,
	"Björn Töpel" <bjorn.topel@intel.com>,
	"John Fastabend" <john.fastabend@gmail.com>,
	"Jesper Dangaard Brouer" <hawk@kernel.org>,
	"Arnaldo Carvalho de Melo" <acme@redhat.com>,
	"Song Liu" <song@kernel.org>
Subject: [PATCH 09/15] bpf: Add bpf_ksym_add/del functions
Date: Mon,  2 Mar 2020 15:31:48 +0100	[thread overview]
Message-ID: <20200302143154.258569-10-jolsa@kernel.org> (raw)
In-Reply-To: <20200302143154.258569-1-jolsa@kernel.org>

Adding bpf_ksym_add/del functions as locked version
for __bpf_ksym_add/del. It will be used in following
patches for bpf_trampoline and bpf_dispatcher.

Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
---
 include/linux/bpf.h |  3 +++
 kernel/bpf/core.c   | 14 ++++++++++++++
 2 files changed, 17 insertions(+)

diff --git a/include/linux/bpf.h b/include/linux/bpf.h
index 5d6649cdc3df..76934893bccf 100644
--- a/include/linux/bpf.h
+++ b/include/linux/bpf.h
@@ -573,6 +573,9 @@ struct bpf_image {
 #define BPF_IMAGE_SIZE (PAGE_SIZE - sizeof(struct bpf_image))
 bool is_bpf_image_address(unsigned long address);
 void *bpf_image_alloc(void);
+/* Called only from code, so there's no need for stubs. */
+void bpf_ksym_add(struct bpf_ksym *ksym);
+void bpf_ksym_del(struct bpf_ksym *ksym);
 #else
 static inline struct bpf_trampoline *bpf_trampoline_lookup(u64 key)
 {
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 387e1bac3a45..46ef6f66aab4 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -652,6 +652,13 @@ static void __bpf_ksym_add(struct bpf_ksym *ksym)
 	latch_tree_insert(&ksym->tnode, &bpf_ksym_tree, &bpf_ksym_tree_ops);
 }
 
+void bpf_ksym_add(struct bpf_ksym *ksym)
+{
+	spin_lock_bh(&bpf_lock);
+	__bpf_ksym_add(ksym);
+	spin_unlock_bh(&bpf_lock);
+}
+
 static void __bpf_ksym_del(struct bpf_ksym *ksym)
 {
 	if (list_empty(&ksym->lnode))
@@ -661,6 +668,13 @@ static void __bpf_ksym_del(struct bpf_ksym *ksym)
 	list_del_rcu(&ksym->lnode);
 }
 
+void bpf_ksym_del(struct bpf_ksym *ksym)
+{
+	spin_lock_bh(&bpf_lock);
+	__bpf_ksym_del(ksym);
+	spin_unlock_bh(&bpf_lock);
+}
+
 static bool bpf_prog_kallsyms_candidate(const struct bpf_prog *fp)
 {
 	return fp->jited && !bpf_prog_was_classic(fp);
-- 
2.24.1


  parent reply	other threads:[~2020-03-02 14:32 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-02 14:31 [PATCHv4 00/15] bpf: Add trampoline and dispatcher to /proc/kallsyms Jiri Olsa
2020-03-02 14:31 ` [PATCH 01/15] x86/mm: Rename is_kernel_text to __is_kernel_text Jiri Olsa
2020-03-02 14:31 ` [PATCH 02/15] bpf: Add bpf_trampoline_ name prefix for DECLARE_BPF_DISPATCHER Jiri Olsa
2020-03-02 14:31 ` [PATCH 03/15] bpf: Add struct bpf_ksym Jiri Olsa
2020-03-02 14:31 ` [PATCH 04/15] bpf: Add name to " Jiri Olsa
2020-03-02 14:31 ` [PATCH 05/15] bpf: Move lnode list node " Jiri Olsa
2020-03-02 14:31 ` [PATCH 06/15] bpf: Add bpf_ksym_tree tree Jiri Olsa
2020-03-03 18:03   ` Alexei Starovoitov
2020-03-03 20:12     ` Jiri Olsa
2020-03-02 14:31 ` [PATCH 07/15] bpf: Move bpf_tree add/del from bpf_prog_ksym_node_add/del Jiri Olsa
2020-03-02 14:31 ` [PATCH 08/15] bpf: Separate kallsyms add/del functions Jiri Olsa
2020-03-02 14:31 ` Jiri Olsa [this message]
2020-03-02 14:31 ` [PATCH 10/15] bpf: Rename bpf_tree to bpf_progs_tree Jiri Olsa
2020-03-02 14:31 ` [PATCH 11/15] bpf: Add trampolines to kallsyms Jiri Olsa
2020-03-02 14:31 ` [PATCH 12/15] bpf: Add dispatchers " Jiri Olsa
2020-03-02 14:31 ` [PATCH 13/15] perf tools: Synthesize bpf_trampoline/dispatcher ksymbol event Jiri Olsa
2020-03-02 14:31 ` [PATCH 14/15] perf tools: Set ksymbol dso as loaded on arrival Jiri Olsa
2020-03-02 14:31 ` [PATCH 15/15] perf annotate: Add base support for bpf_image Jiri Olsa
2020-03-12 19:55 [PATCHv5 00/15] bpf: Add trampoline and dispatcher to /proc/kallsyms Jiri Olsa
2020-03-12 19:56 ` [PATCH 09/15] bpf: Add bpf_ksym_add/del functions Jiri Olsa

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