• Arnd Bergmann's avatar
    dma-ops: Remove flush_write_buffers() in dma-mapping-common.h · a8ad568d
    Arnd Bergmann authored
    This moves flush_write_buffers() in
    asm-generic/dma-mapping-common.h to
    arch/x86/kernel/pci-nommu.c.
    
    The purpose of this patch is that, we can avoid defining NULL
    flush_write_buffers() on IA64 and SPARC.
    
    dma-mapping-common.h is used by X86 and IA64 (and SPARC soon)
    but only X86 with CONFIG_X86_OOSTORE or CONFIG_X86_PPRO_FENCE
    actually uses flush_write_buffers(). CONFIG_X86_OOSTORE or
    CONFIG_X86_PPRO_FENCE is usable with only kernel/pci-nommu.c
    (that is, not usable with other X86 IOMMU implementations such
    as SWIOTLB, VT-d, etc) so we can safely move
    flush_write_buffers() in asm-generic/dma-mapping-common.h to
    arch/x86/kernel/pci-nommu.c.
    
    The further discussion is:
    
      http://lkml.org/lkml/2009/6/28/104Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
    Acked-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
    Cc: davem@davemloft.net
    Cc: tony.luck@intel.com
    Cc: fenghua.yu@intel.com
    LKML-Reference: <1249872797-1314-2-git-send-email-fujita.tomonori@lab.ntt.co.jp>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    a8ad568d
pci-nommu.c 3.04 KB