On 05/17/2012 07:54 PM, Marek Szyprowski wrote:
> find_vm_area() function is usefull for other core subsystems (like
> dma-mapping) to get access to vm_area internals.
>
> Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
> Reviewed-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
We can't know how you want to use this function.
It would be better to fold this patch into [4/4].
> ---
> include/linux/vmalloc.h | 1 +
> mm/vmalloc.c | 10 +++++++++-
> 2 files changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
> index 2e28f4d..6071e91 100644
> --- a/include/linux/vmalloc.h
> +++ b/include/linux/vmalloc.h
> @@ -93,6 +93,7 @@ extern struct vm_struct *__get_vm_area_caller(unsigned long size,
> unsigned long start, unsigned long end,
> const void *caller);
> extern struct vm_struct *remove_vm_area(const void *addr);
> +extern struct vm_struct *find_vm_area(const void *addr);
>
> extern int map_vm_area(struct vm_struct *area, pgprot_t prot,
> struct page ***pages);
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index 8bc7f3ef..8cb7f22 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -1402,7 +1402,15 @@ struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
> -1, GFP_KERNEL, caller);
> }
>
> -static struct vm_struct *find_vm_area(const void *addr)
> +/**
> + * find_vm_area - find a continuous kernel virtual area
> + * @addr: base address
> + *
> + * Search for the kernel VM area starting at @addr, and return it.
> + * It is up to the caller to do all required locking to keep the returned
> + * pointer valid.
> + */
> +struct vm_struct *find_vm_area(const void *addr)
> {
> struct vmap_area *va;
>
--
Kind regards,
Minchan Kim
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