[MIPS] Rename CONFIG_BUILD_ELF64 into KBUILD_64BIT_SYM32

This patch renames it for 3 reasons:

    - "CONFIG" pattern is used by Kconfig. Now this macro is
      no more defined by Kconfig but by Kbuild itself make this
      clear by translating "CONFIG" into "KBUILD".

    - "ELF32" word is improper because it is irrelevant to ELF
      format and it makes confusion with CONFIG_BOOT_ELF32. So
      translate it with SYM32.

    - Add "64BIT" part to make clear that this macro implies a
      64 bits kernel.
Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/Makefile

@@ -577,19 +577,17 @@ endif
 # Automatically detect the build format. By default we choose
 # the elf format according to the load address.
 # We can always force a build with a 64-bits symbol format by
-# passing 'BUILD_ELF32=no' option to the make's command line.
+# passing 'KBUILD_SYM32=no' option to the make's command line.
 #
 ifdef CONFIG_64BIT
-  ifndef BUILD_ELF32
+  ifndef KBUILD_SYM32
     ifeq ($(shell expr $(load-y) \< 0xffffffff80000000), 0)
-      BUILD_ELF32 = y
+      KBUILD_SYM32 = y
     endif
   endif
 
-  ifeq ($(BUILD_ELF32), y)
-    cflags-y += -msym32
-  else
-    cflags-y += -DCONFIG_BUILD_ELF64
+  ifeq ($(KBUILD_SYM32), y)
+    cflags-y += -msym32 -DKBUILD_64BIT_SYM32
   endif
 endif
 

include/asm-mips/page.h

@@ -142,7 +142,7 @@ typedef struct { unsigned long pgprot; } pgprot_t;
 /*
  * __pa()/__va() should be used only during mem init.
  */
-#if defined(CONFIG_64BIT) && !defined(CONFIG_BUILD_ELF64)
+#ifdef KBUILD_64BIT_SYM32
 #define __pa(x)								\
 ({									\
     unsigned long __x = (unsigned long)(x);				\

include/asm-mips/pgtable-64.h

@@ -104,7 +104,7 @@
 #define VMALLOC_START		MAP_BASE
 #define VMALLOC_END	\
 	(VMALLOC_START + PTRS_PER_PGD * PTRS_PER_PMD * PTRS_PER_PTE * PAGE_SIZE)
-#if defined(CONFIG_MODULES) && !defined(CONFIG_BUILD_ELF64) && \
+#if defined(CONFIG_MODULES) && defined(KBUILD_64BIT_SYM32) && \
 	VMALLOC_START != CKSSEG
 /* Load modules into 32bit-compatible segment. */
 #define MODULE_START	CKSSEG

include/asm-mips/stackframe.h

@@ -91,14 +91,14 @@
 #else
 		MFC0	k0, CP0_CONTEXT
 #endif
-#if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4)
+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
+		lui	k1, %hi(kernelsp)
+#else
 		lui	k1, %highest(kernelsp)
 		daddiu	k1, %higher(kernelsp)
 		dsll	k1, 16
 		daddiu	k1, %hi(kernelsp)
 		dsll	k1, 16
-#else
-		lui	k1, %hi(kernelsp)
 #endif
 		LONG_SRL	k0, PTEBASE_SHIFT
 		LONG_ADDU	k1, k0
@@ -116,14 +116,14 @@
 		.endm
 #else
 		.macro	get_saved_sp	/* Uniprocessor variation */
-#if defined(CONFIG_BUILD_ELF64) || (defined(CONFIG_64BIT) && __GNUC__ < 4)
+#if defined(CONFIG_32BIT) || defined(KBUILD_64BIT_SYM32)
+		lui	k1, %hi(kernelsp)
+#else
 		lui	k1, %highest(kernelsp)
 		daddiu	k1, %higher(kernelsp)
 		dsll	k1, k1, 16
 		daddiu	k1, %hi(kernelsp)
 		dsll	k1, k1, 16
-#else
-		lui	k1, %hi(kernelsp)
 #endif
 		LONG_L	k1, %lo(kernelsp)(k1)
 		.endm