MIPS: Simplify GCC_OFF_SMALL_ASM definition

The GCC_OFF_SMALL_ASM macro defines the constraint to use for
instructions needing "small offsets", typically the LL or SC
instructions. Historically these had 16 bit offsets, but microMIPS &
MIPS32/MIPS64r6 onwards reduced the width of the offset field.

GCC 4.9 & higher supports a ZC constraint which matches the offset
requirements of the LL & SC instructions. Where supported we can use
the ZC constraint regardless of ISA, and it will handle the requirements
of the ISA correctly. As such we require 3 cases:

  - GCC 4.9 & higher can use ZC.

  - GCC older than 4.9 must use the older R constraint, which does not
    take into account microMIPS or MIPSr6.

  - microMIPS builds therefore require GCC 4.9 or higher. MIPSr6 support
    was only introduced in newer compilers anyway so it can be ignored
    here.

The current code complicates this a little by specifically having MIPSr6
bypass the GCC version check, and using the R constraint for pre-MIPSr6
builds even if the compiler supports ZC which would be equivalent.

Simplify this such that the code straightforwardly implements the 3
cases outlined above.

For non-GCC compilers we presume that ZC is safe to use. In practice the
only non-GCC compiler of interest is clang and it has supported the ZC
constraint since version 3.7.0. It seems safe enough to presume that
nobody will expect to built a working kernel using a clang version older
than that, and if they do then they'll have bigger problems. As such we
don't check the clang version number & just presume ZC is usable when
the compiler is not GCC.
Signed-off-by: Paul Burton <paul.burton@mips.com>
Patchwork: https://patchwork.linux-mips.org/patch/20999/
Cc: linux-mips@linux-mips.org

arch/mips/include/asm/compiler.h

@@ -43,18 +43,14 @@
 #undef barrier_before_unreachable
 #define barrier_before_unreachable() asm volatile(".insn")
 
-#ifdef CONFIG_CPU_MIPSR6
-/* All MIPS R6 toolchains support the ZC constrain */
-#define GCC_OFF_SMALL_ASM() "ZC"
-#else
-#ifndef CONFIG_CPU_MICROMIPS
-#define GCC_OFF_SMALL_ASM() "R"
-#elif __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)
-#define GCC_OFF_SMALL_ASM() "ZC"
+#if !defined(CONFIG_CC_IS_GCC) || \
+    (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 9)
+# define GCC_OFF_SMALL_ASM() "ZC"
+#elif defined(CONFIG_CPU_MICROMIPS)
+# error "microMIPS compilation unsupported with GCC older than 4.9"
 #else
-#error "microMIPS compilation unsupported with GCC older than 4.9"
-#endif /* CONFIG_CPU_MICROMIPS */
-#endif /* CONFIG_CPU_MIPSR6 */
+# define GCC_OFF_SMALL_ASM() "R"
+#endif
 
 #ifdef CONFIG_CPU_MIPSR6
 #define MIPS_ISA_LEVEL "mips64r6"