• Hugh Dickins's avatar
    [PATCH] unpaged: private write VM_RESERVED · 83e9b7e9
    Hugh Dickins authored
    The PageReserved removal in 2.6.15-rc1 issued a "deprecated" message when you
    tried to mmap or mprotect MAP_PRIVATE PROT_WRITE a VM_RESERVED, and failed
    with -EACCES: because do_wp_page lacks the refinement to COW pages in those
    areas, nor do we expect to find anonymous pages in them; and it seemed just
    bloat to add code for handling such a peculiar case.  But immediately it
    caused vbetool and ddcprobe (using lrmi) to fail.
    So revert the "deprecated" messages, letting mmap and mprotect succeed.  But
    leave do_wp_page's BUG_ON(vma->vm_flags & VM_RESERVED) in place until we've
    added the code to do it right: so this particular patch is only good if the
    app doesn't really need to write to that private area.
    Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
mprotect.c 6.52 KB