Re: [Xen-devel] [PATCH 02/10] Move PAGE_SHIFT to memmap.h

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Fri, Aug 19, 2011 at 01:03:19AM +0900, Daniel Castro wrote:
> PAGE_SHIFT is used by both Virtio and Xen as a contant when moving
> addresses from guest space to machine space, in order to have a
> single definition PAGE_SHIFT has been moved to memmap.h. This has
> no impact on neither virtio or xen.
> 
> Signed-off-by: Daniel Castro <evil.dani@xxxxxxxxx>
> ---
>  src/memmap.h      |    2 ++
>  src/virtio-ring.h |    2 +-
>  2 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/src/memmap.h b/src/memmap.h
> index 01c7ddb..8674168 100644
> --- a/src/memmap.h
> +++ b/src/memmap.h
> @@ -21,6 +21,8 @@ void memmap_finalize(void);
>  
>  // A typical OS page size
>  #define PAGE_SIZE 4096
> +//Used by Virtio and Xen
> +#define PAGE_SHIFT 12

So aren't those two files also used on other architectures - say
PPC64 which have a different page size - 64K. Isn't there some other
defines for this? Or are the patches for that not present anywhere yet?

>  
>  // e820 map storage (defined in system.c)
>  extern struct e820entry e820_list[];
> diff --git a/src/virtio-ring.h b/src/virtio-ring.h
> index b7a7aaf..fd30778 100644
> --- a/src/virtio-ring.h
> +++ b/src/virtio-ring.h
> @@ -4,7 +4,7 @@
>  #include "types.h" // u64
>  #include "memmap.h" // PAGE_SIZE
>  
> -#define PAGE_SHIFT 12
> +
>  #define PAGE_MASK  (PAGE_SIZE-1)
>  
>  #define virt_to_phys(v) (unsigned long)(v)
> -- 
> 1.7.4.1
> 
> 
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