Re: [Xen-devel] [PATCH] x86/xen: Free bootmem in free_p2m_page() during early boot

[Juergen Gross <jgross@xxxxxxxx>]

On 01/07/2015 03:08 PM, Boris Ostrovsky wrote:
> With recent changes in p2m we now have legitimate cases when
> p2m memory needs to be freed during early boot (i.e. before
> slab is initialized).
>
> Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Reviewed-by: Juergen Gross <jgross@xxxxxxxx>

> ---
>   arch/x86/xen/p2m.c | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/xen/p2m.c b/arch/x86/xen/p2m.c
> index edbc7a6..df8acb4 100644
> --- a/arch/x86/xen/p2m.c
> +++ b/arch/x86/xen/p2m.c
> @@ -167,10 +167,13 @@ static void * __ref alloc_p2m_page(void)
>         return (void *)__get_free_page(GFP_KERNEL | __GFP_REPEAT);
>   }
>
> -/* Only to be called in case of a race for a page just allocated! */
>   static void free_p2m_page(void *p)
>   {
> -       BUG_ON(!slab_is_available());
> +       if (unlikely(!slab_is_available())) {
> +               free_bootmem((unsigned long)p, PAGE_SIZE);
> +               return;
> +       }
> +
>         free_page((unsigned long)p);
>   }

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