Re: [PATCH] Add __vunmap prototype

[Andrew Morton <akpm@linux-foundation.org>]

On Mon, 14 May 2007 17:07:03 +1000 Benjamin Herrenschmidt <benh@kernel.crashing.org> wrote:

> __vunmap is not static but I couldn't find a prototype for it, so this
> adds it. I need to use it in some powerpc patch to come.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
> 
>  include/linux/vmalloc.h |    1 +
>  1 file changed, 1 insertion(+)
> 
> Index: linux-cell/include/linux/vmalloc.h
> ===================================================================
> --- linux-cell.orig/include/linux/vmalloc.h	2007-05-14 16:03:42.000000000 +1000
> +++ linux-cell/include/linux/vmalloc.h	2007-05-14 16:03:47.000000000 +1000
> @@ -50,6 +50,7 @@ extern void vfree(void *addr);
>  extern void *vmap(struct page **pages, unsigned int count,
>  			unsigned long flags, pgprot_t prot);
>  extern void vunmap(void *addr);
> +extern void __vunmap(void *addr, int deallocate_pages);
>  
>  extern int remap_vmalloc_range(struct vm_area_struct *vma, void *addr,
>  							unsigned long pgoff);

um, the only possible reason for wanting to access __vunmap() is that you
want to do vunmap() from interrupt context, which is deadlockable.