x86/percpu: Refer __percpu_prefix to __force_percpu_prefix

Refer __percpu_prefix to __force_percpu_prefix to avoid duplicate
definition. While there, slightly reorder definitions to a more
logical sequence, remove unneeded double quotes and move misplaced
comment to the right place.

No functional changes intended.

Signed-off-by: Uros Bizjak <[e-mail]>
Signed-off-by: Ingo Molnar <[e-mail]>
Cc: H. Peter Anvin <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/x86/include/asm/percpu.h

···
 
 #ifdef CONFIG_SMP
 
+#define __force_percpu_prefix	"%%"__stringify(__percpu_seg)":"
+
 #ifdef CONFIG_CC_HAS_NAMED_AS
 
 #ifdef __CHECKER__
···
 # define __seg_fs		__attribute__((address_space(__seg_fs)))
 #endif
 
+#define __percpu_prefix
 #define __percpu_seg_override	CONCATENATE(__seg_, __percpu_seg)
-#define __percpu_prefix		""
 
 #else /* !CONFIG_CC_HAS_NAMED_AS: */
 
+#define __percpu_prefix		__force_percpu_prefix
 #define __percpu_seg_override
-#define __percpu_prefix		"%%"__stringify(__percpu_seg)":"
 
 #endif /* CONFIG_CC_HAS_NAMED_AS */
-
-#define __force_percpu_prefix	"%%"__stringify(__percpu_seg)":"
-#define __my_cpu_offset		this_cpu_read(this_cpu_off)
 
 /*
  * Compared to the generic __my_cpu_offset version, the following
  * saves one instruction and avoids clobbering a temp register.
- *
+ */
+#define __my_cpu_offset		this_cpu_read(this_cpu_off)
+
+/*
  * arch_raw_cpu_ptr should not be used in 32-bit VDSO for a 64-bit
  * kernel, because games are played with CONFIG_X86_64 there and
  * sizeof(this_cpu_off) becames 4.
···
 
 #else /* !CONFIG_SMP: */
 
+#define __force_percpu_prefix
+#define __percpu_prefix
 #define __percpu_seg_override
-#define __percpu_prefix		""
-#define __force_percpu_prefix	""
 
 #define PER_CPU_VAR(var)	(var)__percpu_rel
 
···
 # define __my_cpu_var(var)	(*__my_cpu_ptr(&(var)))
 #endif
 
-#define __percpu_arg(x)		__percpu_prefix "%" #x
 #define __force_percpu_arg(x)	__force_percpu_prefix "%" #x
+#define __percpu_arg(x)		__percpu_prefix "%" #x
 
 /*
  * For arch-specific code, we can use direct single-insn ops (they