From 851a4cd7cc11fcebfa833824415fc57cf180cadf Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@kernel.org>
Date: Wed, 19 Dec 2018 11:20:57 +0100
Subject: [PATCH] Revert "x86/alternatives: Macrofy lock prefixes to work
 around GCC inlining bugs"

This reverts commit 77f48ec28e4ccff94d2e5f4260a83ac27a7f3099.

See this commit for details about the revert:

  e769742d3584 ("Revert "x86/jump-labels: Macrofy inline assembly code to work around GCC inlining bugs"")

Reported-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Borislav Petkov <bp@alien8.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Juergen Gross <jgross@suse.com>
Cc: Richard Biener <rguenther@suse.de>
Cc: Kees Cook <keescook@chromium.org>
Cc: Segher Boessenkool <segher@kernel.crashing.org>
Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Nadav Amit <namit@vmware.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/x86/include/asm/alternative-asm.h | 20 ++++++--------------
 arch/x86/include/asm/alternative.h     | 11 +++++++++--
 arch/x86/kernel/macros.S               |  1 -
 3 files changed, 15 insertions(+), 17 deletions(-)

diff --git a/arch/x86/include/asm/alternative-asm.h b/arch/x86/include/asm/alternative-asm.h
index 8e4ea39e55d0..31b627b43a8e 100644
--- a/arch/x86/include/asm/alternative-asm.h
+++ b/arch/x86/include/asm/alternative-asm.h
@@ -7,24 +7,16 @@
 #include <asm/asm.h>
 
 #ifdef CONFIG_SMP
-.macro LOCK_PREFIX_HERE
+	.macro LOCK_PREFIX
+672:	lock
 	.pushsection .smp_locks,"a"
 	.balign 4
-	.long 671f - .		# offset
+	.long 672b - .
 	.popsection
-671:
-.endm
-
-.macro LOCK_PREFIX insn:vararg
-	LOCK_PREFIX_HERE
-	lock \insn
-.endm
+	.endm
 #else
-.macro LOCK_PREFIX_HERE
-.endm
-
-.macro LOCK_PREFIX insn:vararg
-.endm
+	.macro LOCK_PREFIX
+	.endm
 #endif
 
 /*
diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h
index d7faa16622d8..4cd6a3b71824 100644
--- a/arch/x86/include/asm/alternative.h
+++ b/arch/x86/include/asm/alternative.h
@@ -31,8 +31,15 @@
  */
 
 #ifdef CONFIG_SMP
-#define LOCK_PREFIX_HERE "LOCK_PREFIX_HERE\n\t"
-#define LOCK_PREFIX "LOCK_PREFIX "
+#define LOCK_PREFIX_HERE \
+		".pushsection .smp_locks,\"a\"\n"	\
+		".balign 4\n"				\
+		".long 671f - .\n" /* offset */		\
+		".popsection\n"				\
+		"671:"
+
+#define LOCK_PREFIX LOCK_PREFIX_HERE "\n\tlock; "
+
 #else /* ! CONFIG_SMP */
 #define LOCK_PREFIX_HERE ""
 #define LOCK_PREFIX ""
diff --git a/arch/x86/kernel/macros.S b/arch/x86/kernel/macros.S
index 852487a9fc56..f1fe1d570365 100644
--- a/arch/x86/kernel/macros.S
+++ b/arch/x86/kernel/macros.S
@@ -8,4 +8,3 @@
 
 #include <linux/compiler.h>
 #include <asm/refcount.h>
-#include <asm/alternative-asm.h>
-- 
2.30.2