linux-kernel - [PATCHv3 bpf-next 1/5] kallsyms: Fully export kallsyms_on_each

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Message-Id: <20220427210345.455611-2-jolsa@kernel.org>
Date:   Wed, 27 Apr 2022 23:03:41 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Christoph Hellwig <hch@....de>, netdev@...r.kernel.org,
        bpf@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>
Subject: [PATCHv3 bpf-next 1/5] kallsyms: Fully export kallsyms_on_each_symbol function

Fully exporting kallsyms_on_each_symbol function, so it can be used
in following changes.

Rather than adding another ifdef option let's export the function
completely (when CONFIG_KALLSYMS option is defined).

Cc: Christoph Hellwig <hch@....de>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 include/linux/kallsyms.h | 5 +++++
 kernel/kallsyms.c        | 2 --
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/linux/kallsyms.h b/include/linux/kallsyms.h
index ce1bd2fbf23e..d423f3cffa6d 100644
--- a/include/linux/kallsyms.h
+++ b/include/linux/kallsyms.h
@@ -163,6 +163,11 @@ static inline bool kallsyms_show_value(const struct cred *cred)
 	return false;
 }
 
+static inline int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *, unsigned long),
+					  void *data)
+{
+	return -EOPNOTSUPP;
+}
 #endif /*CONFIG_KALLSYMS*/
 
 static inline void print_ip_sym(const char *loglvl, unsigned long ip)
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 79f2eb617a62..fdfd308bebc4 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -228,7 +228,6 @@ unsigned long kallsyms_lookup_name(const char *name)
 	return module_kallsyms_lookup_name(name);
 }
 
-#ifdef CONFIG_LIVEPATCH
 /*
  * Iterate over all symbols in vmlinux.  For symbols from modules use
  * module_kallsyms_on_each_symbol instead.
@@ -251,7 +250,6 @@ int kallsyms_on_each_symbol(int (*fn)(void *, const char *, struct module *,
 	}
 	return 0;
 }
-#endif /* CONFIG_LIVEPATCH */
 
 static unsigned long get_symbol_pos(unsigned long addr,
 				    unsigned long *symbolsize,
-- 
2.35.1