WARNING - OLD ARCHIVES

This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
   
 
 
Xen 
 
Home Products Support Community News
 
   
 

xen-devel

[Xen-devel] Re: [PATCH 18 of 38] x86: unify pci iommu setup and allow sw

On Wed, 2008-11-26 at 11:53 +0900, FUJITA Tomonori wrote:
> 
> > +     BUG_ON(max_slots > 1UL << (BITS_PER_LONG - IO_TLB_SHIFT));
> 
> How can this BUG_ON happen? Using u64 for the mask is fine though.

It covers the cases where the previous code would have overflowed. It
can't happen right now because although mask is 64 bits the value
assigned to it is currently sizeof(unsigned long). If someone changes
the type of that field then we would start seeing unexpected values.

Ian.


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel

<Prev in Thread] Current Thread [Next in Thread>