• David S. Miller's avatar
    sparc64: Make rwsems 64-bit. · 9b3bb86a
    David S. Miller authored
    Basically tip-off the powerpc code, use a 64-bit type and atomic64_t
    interfaces for the implementation.
    
    This gets us off of the by-hand asm code I wrote, which frankly I
    think probably ruins I-cache hit rates.
    
    The idea was the keep the call chains less deep, but anything taking
    the rw-semaphores probably is also calling other stuff and therefore
    already has allocated a stack-frame.  So no real stack frame savings
    ever.
    
    Ben H. has posted patches to make powerpc use 64-bit too and with some
    abstractions we can probably use a shared header file somewhere.
    
    With suggestions from Sam Ravnborg.
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    9b3bb86a
Makefile 1.75 KB