Commit a936af8e authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

x86/smap: Ditch __stringify() 



Linus noticed all users of __ASM_STAC/__ASM_CLAC are with
__stringify(). Just make them a string.

Suggested-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent e74deb11

arch/x86/include/asm/smap.h

+9 −10
Original line number Diff line number Diff line
@@ -13,13 +13,12 @@ 
#ifndef _ASM_X86_SMAP_H

#define _ASM_X86_SMAP_H



#include <linux/stringify.h>

#include <asm/nops.h>

#include <asm/cpufeatures.h>



/* "Raw" instruction opcodes */

#define __ASM_CLAC	.byte 0x0f,0x01,0xca

#define __ASM_STAC	.byte 0x0f,0x01,0xcb

#define __ASM_CLAC	".byte 0x0f,0x01,0xca"

#define __ASM_STAC	".byte 0x0f,0x01,0xcb"



#ifdef __ASSEMBLY__
@@ -28,10 +27,10 @@ 
#ifdef CONFIG_X86_SMAP



#define ASM_CLAC \

	ALTERNATIVE "", __stringify(__ASM_CLAC), X86_FEATURE_SMAP

	ALTERNATIVE "", __ASM_CLAC, X86_FEATURE_SMAP



#define ASM_STAC \

	ALTERNATIVE "", __stringify(__ASM_STAC), X86_FEATURE_SMAP

	ALTERNATIVE "", __ASM_STAC, X86_FEATURE_SMAP



#else /* CONFIG_X86_SMAP */
@@ -49,20 +48,20 @@ 
static __always_inline void clac(void)

{

	/* Note: a barrier is implicit in alternative() */

	alternative("", __stringify(__ASM_CLAC), X86_FEATURE_SMAP);

	alternative("", __ASM_CLAC, X86_FEATURE_SMAP);

}



static __always_inline void stac(void)

{

	/* Note: a barrier is implicit in alternative() */

	alternative("", __stringify(__ASM_STAC), X86_FEATURE_SMAP);

	alternative("", __ASM_STAC, X86_FEATURE_SMAP);

}



static __always_inline unsigned long smap_save(void)

{

	unsigned long flags;



	asm volatile (ALTERNATIVE("", "pushf; pop %0; " __stringify(__ASM_CLAC),

	asm volatile (ALTERNATIVE("", "pushf; pop %0; " __ASM_CLAC,

				  X86_FEATURE_SMAP)

		      : "=rm" (flags) : : "memory", "cc");
@@ -77,9 +76,9 @@ static __always_inline void smap_restore(unsigned long flags) 


/* These macros can be used in asm() statements */

#define ASM_CLAC \

	ALTERNATIVE("", __stringify(__ASM_CLAC), X86_FEATURE_SMAP)

	ALTERNATIVE("", __ASM_CLAC, X86_FEATURE_SMAP)

#define ASM_STAC \

	ALTERNATIVE("", __stringify(__ASM_STAC), X86_FEATURE_SMAP)

	ALTERNATIVE("", __ASM_STAC, X86_FEATURE_SMAP)



#else /* CONFIG_X86_SMAP */

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