• Jared Hulbert's avatar
    return pfn from direct_access, for XIP · 30afcb4b
    Jared Hulbert authored
    Alter the block device ->direct_access() API to work with the new
    get_xip_mem() API (that requires both kaddr and pfn are returned).
    
    Some architectures will not do the right thing in their virt_to_page() for use
    by XIP (to translate from the kernel virtual address returned by
    direct_access(), to a user mappable pfn in XIP's page fault handler.
    
    However, we can't switch it to just return the pfn and not the kaddr, because
    we have no good way to get a kva from a pfn, and XIP requires the kva for its
    read(2) and write(2) handlers.  So we have to return both.
    Signed-off-by: default avatarJared Hulbert <jaredeh@gmail.com>
    Signed-off-by: default avatarNick Piggin <npiggin@suse.de>
    Cc: Carsten Otte <cotte@de.ibm.com>
    Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
    Cc: linux-mm@kvack.org
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    30afcb4b
brd.c 13.4 KB