• Bryan O'Sullivan's avatar
    [PATCH] Introduce __iowrite32_copy · c27a0d75
    Bryan O'Sullivan authored
    This arch-independent routine copies data to a memory-mapped I/O region,
    using 32-bit accesses.  The naming is double-underscored to make it clear
    that it does not guarantee write ordering, nor does it perform a memory
    barrier afterwards; the kernel doc also explicitly states this.  This style
    of access is required by some devices.
    
    This change also introduces include/linux/io.h, at Andrew's suggestion.  It
    only has one occupant at the moment, but is a logical destination for
    oft-replicated contents of include/asm-*/{io,iomap}.h to migrate to.
    Signed-off-by: 's avatarBryan O'Sullivan <bos@pathscale.com>
    Cc: Andi Kleen <ak@muc.de>
    Signed-off-by: 's avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: 's avatarLinus Torvalds <torvalds@osdl.org>
    c27a0d75
iomap_copy.c 1.4 KB