linux-kernel - [tip:x86/urgent] x86/error_inject: Make just_return

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Date:   Tue, 13 Feb 2018 07:25:56 -0800
From:   tip-bot for Arnd Bergmann <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mhiramat@...nel.org, torvalds@...ux-foundation.org, arnd@...db.de,
        hpa@...or.com, jbacik@...com, ast@...nel.org, nico@...aro.org,
        linux-kernel@...r.kernel.org, peterz@...radead.org,
        mingo@...nel.org, tglx@...utronix.de
Subject: [tip:x86/urgent] x86/error_inject: Make just_return_func() globally
 visible

Commit-ID:  01684e72f16727e6ae0aeb1392f478e11ec5b8f7
Gitweb:     https://git.kernel.org/tip/01684e72f16727e6ae0aeb1392f478e11ec5b8f7
Author:     Arnd Bergmann <arnd@...db.de>
AuthorDate: Fri, 2 Feb 2018 15:56:19 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 13 Feb 2018 14:33:35 +0100

x86/error_inject: Make just_return_func() globally visible

With link time optimizations enabled, I get a link failure:

  ./ccLbOEHX.ltrans19.ltrans.o: In function `override_function_with_return':
  <artificial>:(.text+0x7f3): undefined reference to `just_return_func'

Marking the symbol .globl makes it work as expected.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
Acked-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Josef Bacik <jbacik@...com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Nicolas Pitre <nico@...aro.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Fixes: 540adea3809f ("error-injection: Separate error-injection from kprobe")
Link: http://lkml.kernel.org/r/20180202145634.200291-3-arnd@arndb.de
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/lib/error-inject.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/lib/error-inject.c b/arch/x86/lib/error-inject.c
index 7b881d0..3cdf061 100644
--- a/arch/x86/lib/error-inject.c
+++ b/arch/x86/lib/error-inject.c
@@ -7,6 +7,7 @@ asmlinkage void just_return_func(void);
 
 asm(
 	".type just_return_func, @function\n"
+	".globl just_return_func\n"
 	"just_return_func:\n"
 	"	ret\n"
 	".size just_return_func, .-just_return_func\n"