linux-kernel - Re: [PATCH] Add _

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Date:	Mon, 14 May 2007 17:56:47 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add __vunmap prototype

On Mon, 2007-05-14 at 00:16 -0700, Andrew Morton wrote:
> On Mon, 14 May 2007 17:07:03 +1000 Benjamin Herrenschmidt <benh@...nel.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@...nel.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.

Argh... I'm stupid, ignore it !

I just want to __vunmap(addr, 0); which is just what vunmap() does :-)

Why is __vunmap not static btw ? If there's no reason, I'll send a patch
to make it so.

Ben.


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