BITMAP_BITREMAP - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Basic Kernel Library Functions

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NAMEbitmap_bitremap − Apply map defined by a pair of bitmaps to a single bit

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SYNOPSISint bitmap_bitremap(int oldbit, const unsigned long * old, const unsigned long * new, int bits);

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ARGUMENTSoldbit bit position to be mapped old defines domain of map new defines range of map bits number of bits in each of these bitmaps

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DESCRIPTIONLet old and new define a mapping of bit positions, such that whatever position is held by the n−th set bit in old is mapped to the n−th set bit in new​. In the more general case, allowing for the possibility that the weight ´w´ of new is less than the weight of old, map the position of the n−th set bit in old to the position of the m−th set bit in new, where m == n % w​. The positions of unset bits in old are mapped to themselves (the identify map)​. Apply the above specified mapping to bit position oldbit, returning the new bit position​. For example, lets say that old has bits 4 through 7 set, and new has bits 12 through 15 set​. This defines the mapping of bit position 4 to 12, 5 to 13, 6 to 14 and 7 to 15, and of all other bit positions unchanged​. So if say oldbit is 5, then this routine returns 13​.

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