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kernfs: make kernfs_open_file->mmapped a bitfield
More kernfs_open_file->mutex synchronized flags are planned to be added. Convert ->mmapped to a bitfield in preparation. While at it, make kernfs_fop_mmap() use "true" instead of "1" on ->mmapped. Signed-off-by: Tejun Heo <[email protected]> Acked-by: Greg Kroah-Hartman <[email protected]> Acked-by: Acked-by: Zefan Li <[email protected]>
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