On Wednesday 17 April 2013, Linus Torvalds wrote:
> Anyway, I'm attaching the untested patch to several drivers. Guys,
> mind taking a look? The point here is to simplify the interface,
> avoiding bugs, but also:
>
> 5 files changed, 21 insertions(+), 87 deletions(-)
>
> it needs current -git for the new helper function.
>
> NOTE! The driver subsystem .mmap functions seem to almost universally do
>
> if (io_remap_pfn_range(..))
> return -EAGAIN;
> return 0;
I took a look at the hpet_mmap function, which still contains this check:
if (((vma->vm_end - vma->vm_start) != PAGE_SIZE) || vma->vm_pgoff)
return -EINVAL;
As far as I can tell, this check is implied by the new code in
vm_iomap_memory as the len argument passed here is PAGE_SIZE, so you
can remove another three lines in hpet_mmap.
Arnd
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