linux-kernel - Re: [PATCH 1/2] vmap: cope with vm_unmap_aliases before vmalloc

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Date:	Wed, 05 Nov 2008 10:52:12 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH 1/2] vmap: cope with vm_unmap_aliases before vmalloc_init()

Jeremy Fitzhardinge wrote:
> Xen can end up calling vm_unmap_aliases() before vmalloc_init() has
> been called.  In this case its safe to make it a simple no-op.
>
> Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

Ping?  Nick, Ingo: do you want to pick these up, or shall I send them to 
Linus myself?

Thanks,
    J

> ---
> mm/vmalloc.c |    7 +++++++
> 1 file changed, 7 insertions(+)
>
> ===================================================================
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -592,6 +592,8 @@
>
> #define VMAP_BLOCK_SIZE        (VMAP_BBMAP_BITS * PAGE_SIZE)
>
> +static bool vmap_initialized __read_mostly = false;
> +
> struct vmap_block_queue {
>     spinlock_t lock;
>     struct list_head free;
> @@ -828,6 +830,9 @@
>     int cpu;
>     int flush = 0;
>
> +    if (unlikely(!vmap_initialized))
> +        return;
> +
>     for_each_possible_cpu(cpu) {
>         struct vmap_block_queue *vbq = &per_cpu(vmap_block_queue, cpu);
>         struct vmap_block *vb;
> @@ -941,6 +946,8 @@
>         INIT_LIST_HEAD(&vbq->dirty);
>         vbq->nr_dirty = 0;
>     }
> +
> +    vmap_initialized = true;
> }
>
> void unmap_kernel_range(unsigned long addr, unsigned long size)
>
>
> -- 
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