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Commit 851a4cd7 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

Revert "x86/alternatives: Macrofy lock prefixes to work around GCC inlining bugs" 



This reverts commit 77f48ec2.

See this commit for details about the revert:

  e769742d ("Revert "x86/jump-labels: Macrofy inline assembly code to work around GCC inlining bugs"")

Reported-by: default avatarMasahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: default avatarBorislav Petkov <bp@alien8.de>
Reviewed-by: default avatarThomas 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: default avatarIngo Molnar <mingo@kernel.org>
parent ffb61c63

arch/x86/include/asm/alternative-asm.h

+6 −14
Original line number Diff line number Diff line
@@ -7,23 +7,15 @@ 
#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

#else

.macro LOCK_PREFIX_HERE

.endm



.macro LOCK_PREFIX insn:vararg

	.macro LOCK_PREFIX

	.endm

#endif

arch/x86/include/asm/alternative.h

+9 −2
Original line number Diff line number Diff line
@@ -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 ""

arch/x86/kernel/macros.S

+0 −1
Original line number Diff line number Diff line
@@ -8,4 +8,3 @@ 


#include <linux/compiler.h>

#include <asm/refcount.h>
 
#include <asm/alternative-asm.h>