From: Borislav Petkov <bp@suse.de>
Date: Mon, 18 Nov 2019 17:20:12 +0000 (+0100)
Subject: x86/ftrace: Mark ftrace_modify_code_direct() __ref
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=38ebd8d119245eecb99fe00b0f57e269baf22767;p=linux.git

x86/ftrace: Mark ftrace_modify_code_direct() __ref

... because it calls the .init.text function text_poke_early(). That is
ok because it does call that function early, during boot.

Fixes: 9706f7c3531f ("x86/ftrace: Use text_poke()")
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Daniel Bristot de Oliveira <bristot@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20191116204607.GC23231@zn.tnic
---

diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
index 2a179fb35cd18..108ee96f8b663 100644
--- a/arch/x86/kernel/ftrace.c
+++ b/arch/x86/kernel/ftrace.c
@@ -99,7 +99,12 @@ static int ftrace_verify_code(unsigned long ip, const char *old_code)
 	return 0;
 }
 
-static int
+/*
+ * Marked __ref because it calls text_poke_early() which is .init.text. That is
+ * ok because that call will happen early, during boot, when .init sections are
+ * still present.
+ */
+static int __ref
 ftrace_modify_code_direct(unsigned long ip, const char *old_code,
 			  const char *new_code)
 {