On Tuesday 13 December 2005 5:25 pm, Luck, Tony wrote:
> > Tony, can you ack/nak this please? It touches both ia64 and generic
> > code.
>
> So if someone tries to mmap a range that spans across more than
> one EFI memory descriptor, the size will get trimmed back to an
> EFI memory boundary. Isn't that a problem since 1<<EFI_PAGE_SHIFT
> is less than the default ia64 Linux page size?
The EFI page size is smaller than the Linux page size, but firmware
typically coalesces adjacent ranges with the same attributes.
> I think you may need a more complex checker that does aggregation
> of adjacent efi memory descriptors with the same attributes.
We could, but I don't think it's worth it at this point. We've
been using the same simple-minded scheme for validating /dev/mem
read & write requests for quite a while with no problems, and I
don't want to over-engineer this.
If hot-plug memory is ever finished, the checker may have to
be extended to comprehend regions described by ACPI as well as
those described in the boot-time EFI memory map. I think that
would be the right time to make it smarter about spanning
descriptors.
-
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]
