DOC: update xip method info
xip documentation updated: - change "get_xip_page" to "get_xip_mem"; - explain changed function parameters Signed-off-by: Marco Stornelli <marco.stornelli@gmail.com> Signed-off-by: Randy Dunlap <randy.dunlap@oracle.com> Cc: Carsten Otte <cotte@de.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -39,10 +39,11 @@ The block device operation is optional, these block devices support it as of
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today:
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- dcssblk: s390 dcss block device driver
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An address space operation named get_xip_page is used to retrieve reference
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to a struct page. To address the target page, a reference to an address_space,
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and a sector number is provided. A 3rd argument indicates whether the
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function should allocate blocks if needed.
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An address space operation named get_xip_mem is used to retrieve references
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to a page frame number and a kernel address. To obtain these values a reference
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to an address_space is provided. This function assigns values to the kmem and
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pfn parameters. The third argument indicates whether the function should allocate
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blocks if needed.
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This address space operation is mutually exclusive with readpage&writepage that
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do page cache read/write operations.
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