Re: [Xen-devel] [PATCH v2 3/9] xen: arm: make sure we stay within the memory bank during mm setup

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 09/26/2013 11:49 AM, Ian Campbell wrote:
> Otherwise if there is a module in another bank we can run off the end.
> 
> Rename *n to *end to make it clearer what is happening.
> 
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> ---
> v2: Improve commend. s/*n/*end/
> ---
>  xen/arch/arm/setup.c |   13 ++++++++++---
>  1 file changed, 10 insertions(+), 3 deletions(-)
> 
> diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c
> index 5f88076..68f79c4 100644
> --- a/xen/arch/arm/setup.c
> +++ b/xen/arch/arm/setup.c
> @@ -207,9 +207,11 @@ static paddr_t __init consider_modules(paddr_t s, 
> paddr_t e,
>   * Return the end of the non-module region starting at s. In other
>   * words return s the start of the next modules after s.
>   *
> - * Also returns the end of that module in *n.
> + * On input *end is the end of the region wihch should be considered

s/wihch/which

Except this minor typo:

Acked-by: Julien Grall <julien.grall@xxxxxxxxxx>

> + * and is updated to reflect the end of the module, clipped to the end
> + * of the region if it would run over.
>   */
> -static paddr_t __init next_module(paddr_t s, paddr_t *n)
> +static paddr_t __init next_module(paddr_t s, paddr_t *end)
>  {
>      struct dt_module_info *mi = &early_info.modules;
>      paddr_t lowest = ~(paddr_t)0;
> @@ -224,8 +226,10 @@ static paddr_t __init next_module(paddr_t s, paddr_t *n)
>              continue;
>          if ( mod_s > lowest )
>              continue;
> +        if ( mod_s > *end )
> +            continue;
>          lowest = mod_s;
> -        *n = mod_e;
> +        *end = min(*end, mod_e);
>      }
>      return lowest;
>  }
> @@ -454,6 +458,9 @@ static void __init setup_mm(unsigned long dtb_paddr, 
> size_t dtb_size)
>                  e = n = bank_end;
>              }
>  
> +            if ( e > bank_end )
> +                e = bank_end;
> +
>              setup_xenheap_mappings(s>>PAGE_SHIFT, (e-s)>>PAGE_SHIFT);
>  
>              xenheap_mfn_end = e;
> 


-- 
Julien Grall

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