[tip: x86/asm] x86/asm: Have the __ASM_FORM macros handle commas in arguments

[tip-bot2 for H. Peter Anvin (Intel)]

The following commit has been merged into the x86/asm branch of tip:

Commit-ID:     be5bb8021c9731f5593de6419ae35d3f16a3e497
Gitweb:        https://git.kernel.org/tip/be5bb8021c9731f5593de6419ae35d3f16a3e497
Author:        H. Peter Anvin (Intel) <hpa@xxxxxxxxx>
AuthorDate:    Mon, 10 May 2021 02:09:38 -07:00
Committer:     Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Mon, 10 May 2021 12:33:28 +02:00

x86/asm: Have the __ASM_FORM macros handle commas in arguments

The __ASM_FORM macros are really useful, but in order to be able to
use them to define instructions via .byte directives breaks because of
the necessary commas. Change the macros to handle commas correctly.

[ mingo: Removed stray whitespaces & aligned the definitions vertically. ]

Signed-off-by: H. Peter Anvin (Intel) <hpa@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20210510090940.924953-2-hpa@xxxxxxxxx
---
 arch/x86/include/asm/asm.h | 21 ++++++++++-----------
 1 file changed, 10 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 0603c74..93aad0b 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -3,25 +3,24 @@
 #define _ASM_X86_ASM_H
 
 #ifdef __ASSEMBLY__
-# define __ASM_FORM(x)	x
-# define __ASM_FORM_RAW(x)     x
-# define __ASM_FORM_COMMA(x) x,
+# define __ASM_FORM(x, ...)		x,## __VA_ARGS__
+# define __ASM_FORM_RAW(x, ...)		x,## __VA_ARGS__
+# define __ASM_FORM_COMMA(x, ...)	x,## __VA_ARGS__,
 #else
 #include <linux/stringify.h>
-
-# define __ASM_FORM(x)	" " __stringify(x) " "
-# define __ASM_FORM_RAW(x)     __stringify(x)
-# define __ASM_FORM_COMMA(x) " " __stringify(x) ","
+# define __ASM_FORM(x, ...)		" " __stringify(x,##__VA_ARGS__) " "
+# define __ASM_FORM_RAW(x, ...)		    __stringify(x,##__VA_ARGS__)
+# define __ASM_FORM_COMMA(x, ...)	" " __stringify(x,##__VA_ARGS__) ","
 #endif
 
 #ifndef __x86_64__
 /* 32 bit */
-# define __ASM_SEL(a,b) __ASM_FORM(a)
-# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
+# define __ASM_SEL(a,b)		__ASM_FORM(a)
+# define __ASM_SEL_RAW(a,b)	__ASM_FORM_RAW(a)
 #else
 /* 64 bit */
-# define __ASM_SEL(a,b) __ASM_FORM(b)
-# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(b)
+# define __ASM_SEL(a,b)		__ASM_FORM(b)
+# define __ASM_SEL_RAW(a,b)	__ASM_FORM_RAW(b)
 #endif
 
 #define __ASM_SIZE(inst, ...)	__ASM_SEL(inst##l##__VA_ARGS__, \