On Tue, Dec 22, 2009 at 05:47:46AM +0900, Nobuhiro Iwamatsu wrote:
> +#define nop __asm__ __volatile__ ("nop": : :"memory")
> +#define read_barrier() __asm__ __volatile__ (" " : : : "memory")
> +#define write_barrier() __asm__ __volatile__ (" " : : : "memory")
This is true for SH-4, but not for SH-4A, which wants a synco for these.
See how the kernel does it.
The sooner we stop pretending like SH-4A and SH-4 are the same thing the
sooner we stop introducing subtle bugs all over the place.
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