x86_64: Work around old GAS bug

GAS in binutils(2.16.91) could not parse parentheses within
macro parameters unless fully parenthesized, and this is a
workaround to make old gas work without generating below errors:

 arch/x86/kernel/entry_64.S: Assembler messages:
 arch/x86/kernel/entry_64.S:387: Error: too many positional arguments
 arch/x86/kernel/entry_64.S:389: Error: too many positional arguments
 [...]

Signed-off-by: Tao Guo <glorioustao@gmail.com>
Reluctantly-Acked-by: Jan Beulich <jbeulich@novell.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Link: http://lkml.kernel.org/r/1348648102-12653-1-git-send-email-glorioustao@gmail.com
[ Jan argues that these old GAS versions are fragile - which is so, but lets give them a chance. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 23 insertions, 25 deletions

diff --git a/arch/x86/include/asm/calling.h b/arch/x86/include/asm/calling.h
index a9e3a740f697..7f8422a28a46 100644
--- a/arch/x86/include/asm/calling.h
+++ b/arch/x86/include/asm/calling.h
@@ -49,38 +49,36 @@ For 32-bit we have the following conventions - kernel is built with
 #include "dwarf2.h"
 
 /*
- * 64-bit system call stack frame layout defines and helpers, for
- * assembly code (note that the seemingly unnecessary parentheses
- * are to prevent cpp from inserting spaces in expressions that get
- * passed to macros):
+ * 64-bit system call stack frame layout defines and helpers,
+ * for assembly code:
  */
 
-#define R15               (0)
-#define R14               (8)
-#define R13              (16)
-#define R12              (24)
-#define RBP              (32)
-#define RBX              (40)
+#define R15               0
+#define R14               8
+#define R13              16
+#define R12              24
+#define RBP              32
+#define RBX              40
 
 /* arguments: interrupts/non tracing syscalls only save up to here: */
-#define R11              (48)
-#define R10              (56)
-#define R9               (64)
-#define R8               (72)
-#define RAX              (80)
-#define RCX              (88)
-#define RDX              (96)
-#define RSI             (104)
-#define RDI             (112)
-#define ORIG_RAX        (120)       /* + error_code */
+#define R11              48
+#define R10              56
+#define R9               64
+#define R8               72
+#define RAX              80
+#define RCX              88
+#define RDX              96
+#define RSI             104
+#define RDI             112
+#define ORIG_RAX        120       /* + error_code */
 /* end of arguments */
 
 /* cpu exception frame or undefined in case of fast syscall: */
-#define RIP             (128)
-#define CS              (136)
-#define EFLAGS          (144)
-#define RSP             (152)
-#define SS              (160)
+#define RIP             128
+#define CS              136
+#define EFLAGS          144
+#define RSP             152
+#define SS              160
 
 #define ARGOFFSET       R11
 #define SWFRAME         ORIG_RAX