Simple #define for cache line size

[Jason Evans]

Robert Watson wrote:
> Index: arm/include/param.h
> ===================================================================
> --- arm/include/param.h    (revision 190941)
> +++ arm/include/param.h    (working copy)
> @@ -81,6 +81,10 @@
>  #define    ALIGNBYTES    _ALIGNBYTES
>  #define    ALIGN(p)    _ALIGN(p)
> 
> +#ifndef CACHE_LINE_SIZE
> +#define    CACHE_LINE_SIZE    64
> +#endif
> +
>  #define    PAGE_SHIFT    12
>  #define    PAGE_SIZE    (1 << PAGE_SHIFT)    /* Page size */
>  #define    PAGE_MASK    (PAGE_SIZE - 1)
> Index: powerpc/include/param.h

It would be helpful to instead do:

#ifndef CACHE_LINE_SHIFT
#define	CACHE_LINE_SHIFT 6
#endif
#define	CACHE_LINE_SIZE (1 << CACHE_LINE_SHIFT)

In particular, src/lib/libc/stdlib/malloc.c would benefit.

Thanks,
Jason