On Sat, 4 Feb 2006, Roland Dreier wrote:
> On some architectures, mapping the scatterlist may coalesce entries:
> if that coalesced list is then used for freeing the pages afterwards,
> there's a danger that pages may be doubly freed (and others leaked).
>
> Fix Infiniband's __ib_umem_release by freeing from a separate array
> beyond the scatterlist: IB_UMEM_MAX_PAGE_CHUNK lowered to fit one page.
It's now looking like this change won't be needed after all: Andi has
just posted a patch in the "ipr" thread which should stop x86_64 from
interfering with the scatterlist *page,offset,length fields, so what
IB and others were doing should then work safely (current thinking is
that x86_64 is the only architecture which coalesced in that way).
Hugh
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
