MIPS: Avoid macro redefinitions

To be able to compile the kernel with LTO, the assembler macros cannot
be declared in the global scope, or the compiler will complain about
redefined macros.

Update the code so that macros are defined then undefined when they are
used.

Note that virt support was added in 2.24 and xpa in 2.25. So we still
need the TOOLCHAIN defines for them.

Signed-off-by: Paul Cercueil <paul@crapouillou.net>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/include/asm/ginvt.h

@@ -12,11 +12,13 @@ enum ginvt_type {
 
 #ifdef TOOLCHAIN_SUPPORTS_GINV
 # define _ASM_SET_GINV	".set	ginv\n"
+# define _ASM_UNSET_GINV
 #else
-_ASM_MACRO_1R1I(ginvt, rs, type,
-		_ASM_INSN_IF_MIPS(0x7c0000bd | (__rs << 21) | (\\type << 8))
-		_ASM_INSN32_IF_MM(0x0000717c | (__rs << 16) | (\\type << 9)));
-# define _ASM_SET_GINV
+# define _ASM_SET_GINV							\
+	_ASM_MACRO_1R1I(ginvt, rs, type,				\
+			_ASM_INSN_IF_MIPS(0x7c0000bd | (__rs << 21) | (\\type << 8))	\
+			_ASM_INSN32_IF_MM(0x0000717c | (__rs << 16) | (\\type << 9)))
+# define _ASM_UNSET_GINV ".purgem ginvt\n"
 #endif
 
 static __always_inline void ginvt(unsigned long addr, enum ginvt_type type)
@@ -25,6 +27,7 @@ static __always_inline void ginvt(unsigned long addr, enum ginvt_type type)
 		".set	push\n"
 		_ASM_SET_GINV
 		"	ginvt	%0, %1\n"
+		_ASM_UNSET_GINV
 		".set	pop"
 		: /* no outputs */
 		: "r"(addr), "i"(type)

arch/mips/include/asm/mach-loongson64/loongson_regs.h

@@ -21,8 +21,10 @@ static inline u32 read_cpucfg(u32 reg)
 	u32 __res;
 
 	__asm__ __volatile__(
+		_ASM_SET_PARSE_R
 		"parse_r __res,%0\n\t"
 		"parse_r reg,%1\n\t"
+		_ASM_UNSET_PARSE_R
 		".insn \n\t"
 		".word (0xc8080118 | (reg << 21) | (__res << 11))\n\t"
 		:"=r"(__res)
@@ -143,8 +145,10 @@ static inline u32 csr_readl(u32 reg)
 
 	/* RDCSR reg, val */
 	__asm__ __volatile__(
+		_ASM_SET_PARSE_R
 		"parse_r __res,%0\n\t"
 		"parse_r reg,%1\n\t"
+		_ASM_UNSET_PARSE_R
 		".insn \n\t"
 		".word (0xc8000118 | (reg << 21) | (__res << 11))\n\t"
 		:"=r"(__res)
@@ -160,8 +164,10 @@ static inline u64 csr_readq(u32 reg)
 
 	/* DRDCSR reg, val */
 	__asm__ __volatile__(
+		_ASM_SET_PARSE_R
 		"parse_r __res,%0\n\t"
 		"parse_r reg,%1\n\t"
+		_ASM_UNSET_PARSE_R
 		".insn \n\t"
 		".word (0xc8020118 | (reg << 21) | (__res << 11))\n\t"
 		:"=r"(__res)
@@ -175,8 +181,10 @@ static inline void csr_writel(u32 val, u32 reg)
 {
 	/* WRCSR reg, val */
 	__asm__ __volatile__(
+		_ASM_SET_PARSE_R
 		"parse_r reg,%0\n\t"
 		"parse_r val,%1\n\t"
+		_ASM_UNSET_PARSE_R
 		".insn \n\t"
 		".word (0xc8010118 | (reg << 21) | (val << 11))\n\t"
 		:
@@ -189,8 +197,10 @@ static inline void csr_writeq(u64 val, u32 reg)
 {
 	/* DWRCSR reg, val */
 	__asm__ __volatile__(
+		_ASM_SET_PARSE_R
 		"parse_r reg,%0\n\t"
 		"parse_r val,%1\n\t"
+		_ASM_UNSET_PARSE_R
 		".insn \n\t"
 		".word (0xc8030118 | (reg << 21) | (val << 11))\n\t"
 		:
@@ -243,8 +253,10 @@ static inline u64 drdtime(void)
 	u64 val = 0;
 
 	__asm__ __volatile__(
+		_ASM_SET_PARSE_R
 		"parse_r rID,%0\n\t"
 		"parse_r val,%1\n\t"
+		_ASM_UNSET_PARSE_R
 		".insn \n\t"
 		".word (0xc8090118 | (rID << 21) | (val << 11))\n\t"
 		:"=r"(rID),"=r"(val)