linux-kernel - [PATCH 1/2] Extend definitions of _ASM

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Message-Id: <1377803585-5913-2-git-send-email-dl9pf@gmx.de>
Date:	Thu, 29 Aug 2013 21:13:04 +0200
From:	dl9pf@....de
To:	dl9pf@....de
Cc:	pageexec@...email.hu, llvmlinux@...ts.linuxfoundation.org,
	behanw@...verseincode.com, hpa@...or.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] Extend definitions of _ASM_* with a raw format.

From: Jan-Simon Möller <dl9pf@....de>

The __ASM_* macros (e.g. __ASM_DX) are used to return the proper
register name (e.g. edx for 32bit / rdx for 64bit). We want to use this
also in arch/x86/include/asm/uaccess.h / get_user() .
For this to work, we need a raw form as both gcc and clang choke on the
whitespace introduced by __ASM_FORM. Thus __ASM_FORM_RAW was added.
We change __ASM_REG to use the new RAW form.

Signed-off-by: Jan-Simon Möller <dl9pf@....de>
CC: pageexec@...email.hu
CC: llvmlinux@...ts.linuxfoundation.org
CC: behanw@...verseincode.com
CC: hpa@...or.com
CC: linux-kernel@...r.kernel.org
---
 arch/x86/include/asm/asm.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/asm.h b/arch/x86/include/asm/asm.h
index 1c2d247..4582e8e 100644
--- a/arch/x86/include/asm/asm.h
+++ b/arch/x86/include/asm/asm.h
@@ -3,21 +3,25 @@
 
 #ifdef __ASSEMBLY__
 # define __ASM_FORM(x)	x
+# define __ASM_FORM_RAW(x)     x
 # define __ASM_FORM_COMMA(x) x,
 #else
 # define __ASM_FORM(x)	" " #x " "
+# define __ASM_FORM_RAW(x)     #x
 # define __ASM_FORM_COMMA(x) " " #x ","
 #endif
 
 #ifdef CONFIG_X86_32
 # define __ASM_SEL(a,b) __ASM_FORM(a)
+# define __ASM_SEL_RAW(a,b) __ASM_FORM_RAW(a)
 #else
 # 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__, \
 					  inst##q##__VA_ARGS__)
-#define __ASM_REG(reg)		__ASM_SEL(e##reg, r##reg)
+#define __ASM_REG(reg)         __ASM_SEL_RAW(e##reg, r##reg)
 
 #define _ASM_PTR	__ASM_SEL(.long, .quad)
 #define _ASM_ALIGN	__ASM_SEL(.balign 4, .balign 8)
-- 
1.8.1.4

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