Re: [Qemu-devel] [PATCH 02/10] compiler.h: add QEMU_CACHELINE + QEMU_ALIGN() + QEMU_CACHELINE_ALIGNED

[Lluís Vilanova]

Emilio G Cota writes:

> I'm assuming windows compilers don't support this attribute.
> Signed-off-by: Emilio G. Cota <address@hidden>
> ---
>  include/qemu/compiler.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)

> diff --git a/include/qemu/compiler.h b/include/qemu/compiler.h
> index 8f1cc7b..fb946f1 100644
> --- a/include/qemu/compiler.h
> +++ b/include/qemu/compiler.h
> @@ -41,6 +41,16 @@
>  # define QEMU_PACKED __attribute__((packed))
>  #endif
 
> +#define QEMU_CACHELINE (64)
[...]

You should make this a value taken from configure. In linux you could use
something like:

  getconf LEVEL1_DCACHE_LINESIZE

Or an equivalent program using sysconf(3) if getconf is not present.


Cheers,
  Lluis