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    x86: allow CONFIG_ISA_DMA_API to be disabled · 1c00f016
    David Rientjes 提交于
    Not all 64-bit systems require ISA-style DMA, so allow it to be
    configurable.  x86 utilizes the generic ISA DMA allocator from
    kernel/dma.c, so require it only when CONFIG_ISA_DMA_API is enabled.
    
    Disabling CONFIG_ISA_DMA_API is dependent on x86_64 since those machines
    do not have ISA slots and benefit the most from disabling the option (and
    on CONFIG_EXPERT as required by H.  Peter Anvin).
    
    When disabled, this also avoids declaring claim_dma_lock(),
    release_dma_lock(), request_dma(), and free_dma() since those interfaces
    will no longer be provided.
    Signed-off-by: NDavid Rientjes <rientjes@google.com>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Bjorn Helgaas <bjorn.helgaas@hp.com>
    Cc: Russell King <linux@arm.linux.org.uk>
    Cc: "Luck, Tony" <tony.luck@intel.com>
    Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
    1c00f016
Kconfig 68.7 KB