[lkml]   [2004]   [Mar]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: can device drivers return non-ram via vm_ops->nopage?
    On Sun, Mar 21, 2004 at 06:23:22AM +0000, Christoph Hellwig wrote:

    > Not sure how you get to fetchop here, but that driver does map ram
    > pages so it should take pagefaults and not use remap_page_range().

    It's been a while since I looked at this.... the fetchop driver maps
    AMO space which is excluded from the EFI memory map (and any SHub
    aliases) and thus shouldn't be touching anything normally considered


    Checking the source I see:

    if (remap_page_range(vm_start, __pa(maddr), PAGE_SIZE, vma->vm_page_prot)) {
    fetchop_update_stats(-1, -pages);
    return -EAGAIN;

    as part of the drivers 'mmap fop'. The underlying page is actually
    from region-6 so I'm pretty sure it's safe. If you think it is doing
    something weird please let me know.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2005-03-22 14:01    [W:0.018 / U:5.784 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site