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    cramfs: direct memory access support · 99c18ce5
    Nicolas Pitre 提交于
    Small embedded systems typically execute the kernel code in place (XIP)
    directly from flash to save on precious RAM usage. This patch adds to
    cramfs the ability to consume filesystem data directly from flash as
    well. Cramfs is particularly well suited to this feature as it is very
    simple with low RAM usage, and with this feature it is possible to use
    it with no block device support and consequently even lower RAM usage.
    
    This patch was inspired by a similar patch from Shane Nay dated 17 years
    ago that used to be very popular in embedded circles but never made it
    into mainline. This is a cleaned-up implementation that uses far fewer
    ifdef's and gets the actual memory location for the filesystem image
    via MTD at run time. In the context of small IoT deployments, this
    functionality has become relevant and useful again.
    Signed-off-by: NNicolas Pitre <nico@linaro.org>
    Tested-by: NChris Brandt <chris.brandt@renesas.com>
    Reviewed-by: NChristoph Hellwig <hch@lst.de>
    Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>
    99c18ce5
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