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    DateSat, 24 Dec 2005 00:32:26 -0800 (PST)
    FromLinus Torvalds <>
    SubjectRe: More info for DSM w/r/t sunffb on 2.6.15-rc6
    
    On Fri, 23 Dec 2005, David S. Miller wrote:
    >
    > Something like this patch below.
    > 
    > Signed-off-by: David S. Miller <davem@davemloft.net>
    > 
    > diff --git a/drivers/video/sbuslib.c b/drivers/video/sbuslib.c
    > index 646c43f..ac937da 100644
    > --- a/drivers/video/sbuslib.c
    > +++ b/drivers/video/sbuslib.c
    > @@ -46,6 +46,9 @@ int sbusfb_mmap_helper(struct sbus_mmap_
    >  	unsigned long off;
    >  	int i;
    > 
    > +	if (!(vma->vm_flags & VM_SHARED))
    > +		return -EINVAL;
    > +
    
    Side note - as I explained to Nick the other week, VM_SHARED really means 
    "shared _writable_" mapping, so you're now disallowing a shared read-only 
    open too.
    
    Which may be fine, of course. Especially if sbusfb always ends up giving a 
    writable pfn-mapping. But I wanted to check that that was what you meant 
    to do.
    
    To test for MAP_SHARED, either do the is_cow_mapping() thing, or check 
    the VM_MAYSHARE bit.
    
    		Linus
    -
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