Hi Paul,

I love your patch! Yet something to improve:

[auto build test ERROR on ]

url:    https://github.com/0day-ci/linux/commits/James-Hogan/MIPS-Override-barrier_before_unreachable-to-fix-microMIPS/20180418-025742
base:    
config: i386-tinyconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from ./arch/x86/include/generated/asm/compiler.h:1:0,
                    from include/linux/compiler_types.h:58,
                    from <command-line>:0:
>> include/asm-generic/compiler.h:2:2: error: #error "Please don't include <asm/compiler.h> directly, include <linux/compiler.h> instead."
    #error "Please don't include <asm/compiler.h> directly, include <linux/compiler.h> instead."
     ^~~~~
   make[2]: *** [kernel/bounds.s] Error 1
   make[2]: Target '__build' not remade because of errors.
   make[1]: *** [prepare0] Error 2
   make[1]: Target 'prepare' not remade because of errors.
   make: *** [sub-make] Error 2

vim +2 include/asm-generic/compiler.h

   > 2	#error "Please don't include <asm/compiler.h> directly, include <linux/compiler.h> instead."
     3	#endif
     4	

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